Hi to everyone,


I have a Honda cbr1000f-j, I`ve had it for 4 years now and rebuilt most it, a few months ago the fuel pump shorted out and failed, I`ve replaced the pump, but since then had a recurring problem that after opening her up, it coughs and splutters and seems to miss-fire. I`ve replaced the carbs, no difference, I`ve replaced the cdi unit, no difference, checked the loom for breaks, replaced plugs leads and coils, no difference, now it pulls fine up to 5000 rpm then coughs and splutters.


any suggestions, I`m at my witts end.


Thanks in advance for any info


Peter

 

Float levels in the carbs check them
Gravity feed the fuel to the carbs from the other side
and chuck the pump check the mesh petcock filter inside
the tank , check the float valve seat filters when setting the
float levels.

All of these pare remedies to fuel starvation I think you have

]The final check being make sure the gas tank is venting and
a vacuum is not being created as fuel is being used

 

+ 1 with sprock, i repaired my pump and still had problems so i have gravity fed with no problems, just as a matter of intrest have you checked your fuel filter by the pump and no kinks in the pipe work, also as sprock said the mesh one in the tank can clog up (might be worth checking)

 

Hi Wheelnut and Sprock


Thank you for the advice, I will try these one at a time and let you know what it is, be nice to get rid of that pump its been a thorn in my side for to long lol. Once again thank you for taking time out to give advice.


Best regards


Pete

 

If/when you get rid of the pump make sure you use the tank shut off when not riding. Don't want to drain the gas tank into the crank case.

 

Hi Wheelnut and sprock,


Have taken fuel pump out and connected new fuel line, this has worked thank you, still not revving clean, cleaned out pilot and main jets, checked needles and diaphrams are all good, is there a measurement to set the floats to, they looked good to me, opening and closing valve fine and all looked even.
ticks over fine, and under 3000 rpm its clean, but even in neutral it won`t rev over 7000 rpm and coughs and splutters, when riding it starts coughing at about 4000 rpm and won`t go over 5-5,500 rpm.


Thanks in advance


Pete

 

Hi to all,


Just a huge thank you to everyone for there great advice, have removed fuel pump ( glad to see the back of that ), breather in tank was blocked and a dodgy connection to 1-4 coils. she`s not running perfect yet but done 30 miles today which has put a big smile back on my face, once again many thanks to CBRF


A happy biker


Peter

 

If you suspect coil issues I would recommend the stick coil mod. It's easy to do and without a doubt the best upgrade I've done to my bike. Also there is a small filers on the inlet of each carb that can get gunked up. Here's a picture.

 

Hi pmcg,

Thank you for the picture, thats a massive help, also do you have any more info on the stick coils, i.e. can i get them on e-bay?

Kind regards

Peter

 

Here you go.

https://cbrforum.com/forum/cbr-1000f...r1000f-138495/

and the 'How To'

https://cbrforum.com/forum/how-tos-8...ensive-139800/

The search function above is your friend!

Cheers, SB