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This is Precisely What It Price To Rebuild A 1993 Honda CBR900RR Unicorn To Showroom Standing

Discovering the bike of my desires was 95 % of the battle. Right here’s the opposite 5 %.

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I'm Going To Overhaul This Legendary Honda CBR900RR With Simply 988 Miles

I’ve been making an attempt to determine it out for a while now. What’s it about early ’90s sportbikes that…

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I purchased a unicorn of a motorbike—a 1993 Honda CBR900RR with solely 988 miles on the clock. What was the catch? It had been sitting for a few years and was not in in the slightest degree a functioning bike.


What appeared like a enjoyable enterprise at the beginning shortly turned a sobering actuality. It went from being a unicorn to being a dragon that wanted slaying. Engaged on a machine that’s as collectible as an unique CBR900RR brings up challenges that haven’t been current in every other automobile I’ve taken on.

It has nothing to do with the complexity of the bike. It’s really fairly straight-forward to work on. No, it has to do with its originality.

Earlier than getting began.

Each bolt that’s eliminated, each half that’s changed, and each floor that’s cleaned have to be taken into nice consideration. It will be really easy to “higher” the bike, but on the identical time destroy its character. There’s a superb line that have to be walked.


With that in thoughts, I meticulously recognized the parts that wanted repaired on the bike and got down to discover unique, Honda-branded replacements.

I used to be pleasantly stunned to search out that many of the mechanical components are nonetheless out there new. The bodywork, however, is a very completely different matter. There merely aren’t many unique items left on the market. If you’d like an original-looking machine, you’re higher off shopping for a motorbike with good bodywork that wants engine restore, fairly than the opposite method round.

Stripped down for inspection.

Assured that I had situated the components that will have to be changed, I finalized my order and waited for it to reach.

Disassembly & Components Arrival

Whereas ready for the components to point out up, I made a decision to go forward and take the bike right down to its most disassembled state.

Forks and exhaust eliminated, it’s time to go to the molecular stage.

Realizing that many of the bodywork was irreplaceable, I took particularly excellent care when eradicating it. I discovered a pleasant, cozy place within the basement to maintain the fairings whereas I dug into the bike’s mechanicals.

Sleep tight candy prince. See you in a couple of weeks.

After every week and a half, the fantastic field of latest components arrived at my entrance door. The thrill whereas opening the field was virtually overwhelming! I couldn’t consider a few of these components have been nonetheless out there new, together with the bodywork objects I had ordered. I may solely think about how lengthy that they had been sitting in Honda’s warehouse ready to be offered.

A bunch of new-old-stock components and a Manufacturing facility Service Guide. Oh yeah!

It was time to get down and soiled returning this basic CBR again into its former self.

Exhaustive Restoration

The primary spherical of rejuvenation began with the bike’s exhaust system. Particularly, the header and mid pipe. The bike was nonetheless sporting the unique unit, however the metallic that system is constituted of isn’t of the very best high quality. The pipework is delicate grade metal which was painted flat black from the manufacturing facility. The becoming a member of welds are a bit crude, and when left uncovered to moisture, the entire thing tends to rust.

It appeared as if the bike had been ridden by rain, shut off, and left to take a seat for years. Evidently, this wasn’t sort to the exhaust’s look. Oxidation had taken maintain and floor rust had developed.

The one solution to do a correct job of cleansing the exhaust was to fully take away it from the bike. The exhaust studs protruding from the cylinder head that safe the exhaust header to the engine have been corroded and the nuts have been tough to interrupt unfastened. Finally, all of it got here aside.

Scuffing the system frivolously with some Scotch Brite pads made many of the oxidation clear away. A number of the heavier floor rust was eliminated with a wire brush. I then completed the exhaust off with a coat of high-temperature flat black exhaust paint, similar to had been carried out on the manufacturing facility. The top outcome got here out wanting like new.

I fitted the refreshed exhaust system again to the engine with new header studs, nuts, and gaskets.

I then put in the muffler with a brand new gasket and new bolts. The exhaust system was now again to a fresh-from-the-factory look.

Whole Restore Price: $80.86

Engine Renewal

With solely 988 miles on the engine, there wasn’t something really mechanically improper with it. There was a slight beauty imperfection happening, nevertheless. A few years in the past, the bike had a tip-over when its kickstand sunk into some scorching asphalt whereas the bike was parked. This little mishap precipitated some scratches right here and there, together with some gentle scraping to the stator cowl on the left facet of the engine.

As a substitute of making an attempt to refinish the broken cowl, I made a decision to simply purchase a brand new one because it was out there. Popping the previous cowl off wasn’t too tough, however eradicating the previous gasket materials was. To do that form of job proper, it all the time takes longer than you assume it will.

With a brand new gasket utilized, I supplied up the brand new stator cowl to the engine. I utilized a brand new bead of ThreeBond sealant to the rubber grommet, which permits passage of wires operating to the stator itself.

With the brand new cowl put in, you’d by no means be capable of inform that something was ever amiss.


The subsequent merchandise to handle on the bike’s engine was the oil and filter. Not understanding the final time it had been modified, it was pertinent that some contemporary lubrication was put into motion.

With some contemporary 10w-40 semi-synthetic bike oil, a brand new Honda oil filter and drain plug gasket on the prepared, I swapped out the oil. This could be certain that the engine would have correct lubrication as soon as it was awoken from its prolonged slumber.

Whole Restore Price: $134.93

Gas System Repairs

Of all of the programs on the bike, the toughest hit from the extended storage was the gas system. This was primarily as a result of earlier proprietor leaving gas within the bike whereas it sat for years.

A tank stuffed with very previous gasoline. No, that’s not a dent.

Gasoline does nasty issues to metallic and rubber whether it is left to ferment over time. Deposits develop inside small passages within the carburetors, sediment collects within the gasoline tank, the gas filter turns into clogged, and the gas pump runs the chance of getting gummed up. For those who plan to retailer a automobile for a protracted time period, particularly a carbureted one, do everybody a favor and drain the gasoline beforehand.

Letting the genie out of the bottle.

Step one was to empty out the previous gas from the gasoline tank. The fluid that got here out – I received’t even name it gasoline as a result of it was up to now faraway from its unique chemical building – was rank, vomit-inducing stuff. Good occasions for all.


I then eliminated the rack of carburetors from the bike. There are 4 impartial carburetors on the CBR900RR. Which means when previous gas is left to do its detriment, not only one carburetor must be rebuilt, however 4 do.

Eradicating the float bowls was step one to uncovering how screwed up the carbs have been. The inexperienced tint contained in the float chamber informed me what I wanted to know. All the pieces – and I imply the whole lot – inside every carburetor would have to be eliminated, cleaned, and doubtlessly changed. Simply check out the jets, which meter the gas going into the engine. That inexperienced build-up is attributable to extended publicity to expired gasoline. Yuck.

I went by two cans of carburetor cleaner and spent hours scrubbing and blowing in compressed air. Lastly, each hint of the inexperienced stuff was gone from the carbs. I went forward and put in new carburetor jets and float bowl gaskets for peace of thoughts.

With the carburetors reassembled, it was time to maneuver on to the periphery gas system parts. The gas filter seemed long gone its use-by date, so in went a brand new half. Straightforward-peasy.


I examined the gas pump and fortunately all appeared nicely. Nevertheless, its rubber mounting grommet seemed worse for put on. It was cracked up from age and doubtless wouldn’t help the gas pump for much longer. With a brand new mount put in, the pump is nice to go for a very long time to come back.

Becoming the carburetors again as much as the engine must be a easy job. However, the carburetor boots, which seal the carburetors to the engine’s consumption, have been dry-rotted and hardened. This wasn’t going to be such a straightforward job in spite of everything.

As with all rubber half that’s greater than 20 years previous, one of the best plan of action is to switch with new. Because of the pliability of the newly-sourced boots, the carburetors slipped simply again into their rightful place atop the engine.

Whole Restore Price: $147.71

Consumption, Ignition & Cooling

Whereas I used to be within the neighborhood, I made a decision it will be a good suggestion to “reset” all of the consumable components which might be crucial to engine operating. The primary order of enterprise was to swap in new spark plugs.

New vs previous spark plugs.

With new plugs put in, I may relaxation assured contemporary flicker of fuel-igniting spark can be current on the press of the starter button.


The air filters on the bike had been uncovered to a few years of ambient air, moisture, and dirt. The principle air filter may have been cleaned and reinstalled, however I felt that putting in a brand new half can be one step higher.

Whereas I had the airbox eliminated, I observed that there was a further small air filter exterior of the airbox. Honda calls it a “sub-air cleaner,” and I consider it’s there for emissions functions. The unique filter was all however disintegrated. Upon cleansing up the filter housing, the brand new alternative foam factor could possibly be put in.

The bike greater than probably nonetheless had the unique coolant residing inside it. Now was the proper time to empty out the previous stuff and substitute it with new.

This trade of coolant would assure that the engine’s inside coolant passages would stay corrosion free, whereas on the identical time maintaining the engine operating at correct temperature.

Whole Restore Price: $65.22

Making Positive The Bike Truly Labored

Having now accomplished all of the repairs and upkeep work that have an effect on the operating of the bike, I felt it was a great time to attempt to really begin it up. Until the bike may run, there actually was no level in going any additional within the overhaul.

So, how did all of it shake out? Properly, why don’t you see for your self:

That’s proper, it freakin’ began proper up! Alright, perhaps not “proper up,” but it surely fired up shortly sufficient for one thing that hasn’t seen contemporary gasoline in probably a decade. As Mr. Edd China would say, “Job carried out!”

Suspension & Steering

Assured now that each one the work up thus far hadn’t been carried out in useless, I proceeded on to the bike’s dealing with division. The primary order of enterprise was finding out the entrance finish. Particularly, the forks.

The forks on a motorbike are the equal of the springs, dampers, and management arms on a automobile. These two telescopic tubes that join the entrance wheel to the remainder of the bike have an enormous job to carry out. Over time, the oil and seals within the fork tubes degrade, compromising the entire system. Braking, steering, and shock absorption get thrown out of whack, resulting in unpredictable dealing with. Not a great factor on a strong machine similar to this CBR.

With the fork tubes faraway from the bike and set on the work bench, I started taking them aside. I eliminated the fork seals, separated the stanchions from the fork legs, and proceeded to empty out the previous fork oil.

I cleaned up the parts from each fork legs, crammed them up with new oil, and pressed within the new fork seals and wipers. The top outcome seemed showroom-fresh.

Subsequent in line have been the tires. These hunks of rubber have been up to now previous their expiration date that they have been mainly disintegrating. I’m all about preserving originality, however these tires introduced such a security hazard that they needed to go.


The CBR900RR makes use of a novel entrance wheel dimension with a diameter of 16 inches. Most sportbikes these days use a 17 inch entrance wheel. This makes discovering an identical entrance and rear set of latest rubber fairly a job certainly. After some analysis, I discovered that Bridgestone nonetheless makes trendy road supersport tires that match the CBR’s oddball 16 inch entrance wheel.

With the brand new tires put in, the CBR was now able to tackle some curvy roads as soon as once more.

Whole Restore Price: $351.22

Brake System

The brake system was in fine condition for essentially the most half, however the entrance and rear brake fluid reservoirs seemed completely horrible. The brake fluid needed to have been the unique stuff from 1993. Ugh.

The fluid reservoirs themselves had develop into stained and small hairline cracks had began forming within the plastic. Whereas nothing was leaking as of but, I didn’t really feel like taking a danger down the highway. I made a decision to cough up the cash and get new components for the entrance and rear.

With the brand new reservoirs in place, I may begin exchanging the nasty previous brake fluid with new.

With the blackened fluid flushed out of the system, the entrance brake lever and rear brake pedal regained a firmness that would offer confidence when braking.

Whole Restore Price: $45.66

Bodywork Repairs

Taking over the bodywork-related points was the icing on the cake for this bike undertaking. These messy and time-consuming mechanical repairs have been lastly out of the way in which. Time to get on with making the bike look outwardly-pretty.


The left portion of the tail part had been roughed-up within the side-stand tip-over. It had a small crack current and the scratches have been deeper than the paint. It will require a whole skilled repaint to make proper once more. Unbelievably, I used to be in a position to purchase the half model new from Honda for simply $187. No method may I get the previous half repaired for wherever close to that.

I rigorously put in the brand new tail fairing, being ultra-gentle with the entire little plastic interlocking tabs that had develop into brittle with age. The brand new half match up superbly. As soon as the tail fairing was put in, I positioned a brand new “Helmet Holder” decal within the unique location. The satan is within the particulars, as they are saying.

These decals, within the appropriate white background shade, needed to come all the way in which from the UK.

The gasoline tank was in good situation, however the little rubber grommets that isolate it from the body have been fully perished. With new rubber items put in on the tank, it sat comfortably atop the body of the bike as soon as once more.

The decals on the fork rebound adjusters had gone lacking over time. These little stickers are hardly noticeable, however it will drive me insane if I didn’t substitute them. With a brand new set of decals in hand, I put them again of their rightful spots to tidy up the look of the cockpit.

The heel guards had been changed with some…ehem…spirited-looking aftermarket options. After trying to find what appeared like perpetually, I lastly sourced some second-hand unique replacements. The unique heel guards, which lack the pace holes that have been featured on later mannequin CBR900RRs, are surprisingly tough to find. You possibly can’t merely purchase them new anymore.

The ultimate piece of the puzzle was the clutch lever. The unique had been bent within the side-stand tip-over. A brand new Honda-branded alternative was acquired at $12 which was shortly bolted into place.

Whole Restore Price: $351.61

The Figures

Restore Prices: $1,224.01

Store Provides: $46.80

Insurance coverage & Registration: $143.11

Buy Value: $four,00zero.00

Labor Hours: 35


The labor hours could appear excessive for the quantity of labor that was carried out, however I have to inform you large quantity time was allotted to cleansing the bike and its assorted parts. There’s no higher time to element a machine than when it’s fully stripped aside.

Outdated components aftermath.

The top outcome is not only a superbly operating machine; it’s a time capsule. The bike appears to be like prefer it got here straight from an early ’90s Honda showroom ground.

The white-painted bodywork and wheels stand out like solely one thing from the ’90s may. It’s not making an attempt to impress you with sharp angles, LED lighting or a daringly-sparse tail part. It doesn’t exhibit mechanical bits as a part of its aesthetic, nor does it have a elaborate, colourful instrument panel.


The bike proudly shows its full-bodied fairings, its exhaust can hanging off the facet, and its aggressive but elegant “pace holes.” It’s a clear, easy, and sincere design language – traits of which we may use some extra of in the present day.

As of this writing, the bike has 991 miles. That’s proper, I’ve put three entire miles on this stunning machine. It rides like one thing rather more trendy than its age suggests. Fairly frankly, it’s unbelievable. The controls are crisp, the throttle is easy, and gears click on proper into place.


With the originality retained and the mechanical programs revived, it’s official – this basic CBR900RR is again in enterprise.

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