Question about 1996 Honda CBR 400 RR

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CBR 400 RR 1991 jerks in 6th gear

I have bought a CBR 400 RR 1991 and have just noticed that only in 6th gear (mid range rpm) the power becomes jerky and is quite a disconcerting feeling. Could this be a problem with the gear box? or jets?

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In this high a gear, and with the small cc of the bike, and age of it ,it just doesnt have enough torque in that gear unless you are going very fast. nothing is wrong, just save that gear for when you are going real fast

Posted on Jun 14, 2009


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Will not go into netural at tick over have to rev to 4000 and what should tick over be

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My honda cbr looses power in 5th and 6th gear

Hi there.
When in the upper gears, reduced power output from the engine becomes more noticeable in 5th and 6th gear due to the more direct drive created by the higher ratios. First thing I would do is put some additive in the fuel to clean the fuel system and decarbon the head and combustion chambers. I use a Nulon product, not sure what you can get in your part of the world. Techron is another good well known product that works. In fact, if you bike is affected by buildups any brand name cleaner additive will help with the problem.
Also check that the drive chain is well lubed, a dry chain can rob up to 2 kw of power. Check wheel hubs for excessive heat/bearing problems. Happy to talk to you more about it. Cheers
regards robotek

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Compression tester reading on cbr 400rr

In general, as high as possible. But the real test is how close the readings from the cylinders are to each other.

May 09, 2009 | 1991 Honda CBR 400 RR

1 Answer

CBR 400 NC29 not pulling through rev range

The carb has serveral jets for different Rpm ranges. If you have a problem with one range, that specific jet is probably blocked. Idle jet, low jet, intermediate jet, high jet. some bikes have more. Sounds like a jet problem to me Run Seafoam cleaner in a couple tanks.

Apr 30, 2009 | Honda CBR 400 Motorcycles

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A gear problem

Sounds like you have a bent shift fork or two..
You will need an impact driver and torque wrench plus the normal screwdriver, pliers, etc.. Alternate to the special tools is taking it to the dealer and say "Fix it". I normally tell people to take it to the shop just so they don't get into such an involved project.

The motor comes out of the bike then turned upside down for removal of the bottom case. The gears and shafts gotta come out so you can get to the bad fork. There's much more but the idea is that you are better off having the shop do the repair..

Please rate this solution. Thanks

Apr 25, 2009 | 1995 Honda CBR 400 RR

2 Answers

Mc22 CBR 250 revving to high travelling at 100kph

Its okay. For as long as you're not revving the bike on its redline for too long. CBR, XJR and other inline engines love high RPMS. They're built for it.

Mar 15, 2009 | 1990 Honda CBR 250 RR

1 Answer

Spark plug gap

Don't change the setting on the plug. The 400's are happiest when you just plug in new ones and ride. They like NGKs the best. There are two types for the 400. One runs hotter. This choice will depend on which country you live in and what the ambient temperatures are.

Nov 10, 2008 | 1998 Honda CBR 400 RR

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