Question about 1998 Honda CBR 400 RR

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Spark plug gap

What should the spark plug gap be on a 1991 honda cbr 400rr?

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  • Anonymous Mar 21, 2014

    spark plugs are black ,setting is 31 to 35 have them set at 33 what to do?

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  • Master
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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.

Posted on Nov 10, 2008

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Posted on Jan 02, 2017

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1 Answer

My CBR 600f4i runs ok when cold but misfires at running temp and smells of fuel. No error codes are coming up. Can anyone help me? I have renewed the spark plugs.


Hi, Dave and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking check for spark leakage in the dark.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intermittent short circuit due to damaged wire insulation.
8. Intake air leak.
9. Water, dirt, or rust in the fuel system, fuel pump and/or filter.
10. Old dead or bad fuel.
11. Faulty fuel pressure regulator
12. Pinholes in the in tank plastic convoluted tubing from the pressure regulator to the quick disconnect check valve.
13. Fuel tank vent system plugged.
14. Throttle body controls misadjusted.
15. Damaged throttle body or intake seals.
16. Loose, dirty, or corroded ignition module connector at crankcase.
17. Faulty TPS, MAP, CKP, O2, and/or CMP sensors.
18. Incorrect valve timing.
19. Weak or broken valve springs.
20. Damaged intake or exhaust valve'
21. Control module may be in "LIMP" mode
22. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Misfiring please help CBR Forum Enthusiast forums for Honda CBR Owners
Honda CBR600F4I 2001 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR600F4i Owner Manual
Honda CBR 600 F4i 2005

Apr 04, 2017 | 2001 Honda CBR 600 F(4)i

1 Answer

Why would my 1999 honda cbr 600 f4 boggs not letting me go past 55mph


Dirty spark plugs
incorrectly gapped plugs
Bad HT leads or caps (run bike in the dark and look for sparks)
Blocked air filter intake
bad timing
if fuel injected, any number or sensor problems
Bad or watery fuel

Start at the top and work your way down

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I have problem with my 1991 cbr 1000f, I changed the spark plug and now I don't know how to put the cables back on the right way, if someone can help me and tell me what order I plug the cables back, I...


these are dual spark coils. this means that each coil sparks twice on companion cylinders.two leads out of one coil to the two middle cylinders and the two leads out of the other coil go to the two outside cylinders it doesnt matter which coil,but usually one of them has two long leads and the other two shorter leads

Jan 16, 2011 | 1991 Honda CBR 1000 F

1 Answer

Battrey gets very hot on my cbr 400rr


most likely you have a shorted cell, replace the battery.

Mar 09, 2010 | 1990 Honda CBR 400 RR

1 Answer

Hi my honda cbr 600 fl 1991 the bike pulls great


im not sure if this model has a fuel pump but follow your fuel line and see if it does wen u find it remove black plastic cap and check the points contact breakers are in good conditon ie not worn uneven or worn out and that they open and close.check your air filter spark plugs and your carbs could have a blocked jet so get them cleaned and balanced.

Oct 25, 2009 | 1987 Honda CBR 600 F(1)H

1 Answer

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

Wont start


the old petrol has buggered up the jets a good carb cleaning will fix the carbs now drain the old petrol out and get new dont try to mix old and new gas it does no good please give us a rate hope this helps

Jan 03, 2009 | 1988 Honda CBR 400

2 Answers

Spark plug gaping


Go to your nearest Autozone or other parts house and buy an inexpensive plug gapper. I gap the Honda plugs at .045 .

Jun 16, 2008 | 1991 Honda Prelude

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