stutter

jonhunt · Post by **jonhunt** » Sun May 04, 2014 7:07 pm

I have an annoying stutter when running on a steady throttle around 11-12k bike accelerates well no hunting at all will easily pass the red line. Carbs have been clean have new jets from gf. Any suggestions

Post by **GF Racing** » Thu May 08, 2014 4:55 am

Suggest slides may be lifting to quick -- perhaps wrong slide springs or someone may have drilled the slide holes a touch to big.

Some after marked headers give this symptom as well ...

Cheers

jonhunt · Post by **jonhunt** » Thu May 08, 2014 6:03 am

Got the springs from you so I think they will be OK. Other sounds like I need new carbs? Headers are standard. Will replace fuel filter and clean out tap filter first I think

jonhunt · Post by **jonhunt** » Mon Jun 09, 2014 6:55 pm

ok so
replaced fuel pump relay
replaced filter
not much improvement
next
put fuel lines back in correct position
Check fuel pump output.

jonhunt · Post by **jonhunt** » Tue Jun 10, 2014 7:31 pm

fuel pump output 1800cc/min so well above the 660cc min quoted

maxinho · Post by **maxinho** » Sun Jun 15, 2014 5:08 pm

sorry to but in and on my first post here.

i have the same problem with my bike.

revs out fine in neutral but if i am in say 5th or 6th. it trys to hold back all the time.

i took the carbs off today to check the mixture screws and they were set to 1 & 1/2 turns the manual says 2 & 1/4

they may had been a pipe off to but i cant remember as i was a bit hunger over today.

the bike is pulling a bit better but it wont rev past 11000 when in 5th or 6th neutral is fine.

i have a after market pipe on mine.

jonhunt did you just start doing it>? mine has been doing since i got the bike.

jonhunt · Post by **jonhunt** » Tue Jun 17, 2014 11:08 pm

Its done it since rubuilding the carbs but they were such a mess before I can't say if it was there from the off. I don't have a problem with revs I can't bang it well into the red if I'm not carefully and it will hold 13k plius on steady throttle but you can feel a pull and hold back

jonhunt · Post by **jonhunt** » Mon Jun 23, 2014 9:40 pm

Took the carbs off at the weekend, no 4 intake manifold had a sliver of rubber scrapped of probably partly obstructing the airflow. we will see if this makes a difference.

jonhunt · Post by **jonhunt** » Tue Jun 24, 2014 8:05 pm

Seems to be better after a quick run but I want to take it further than I had time for last night, Had the down pipes off as well for a coat of PJ1 there was a lot of carbon soot deposits around the exhaust manifold maybe running rich? Need to check the plugs.

jonhunt · Post by **jonhunt** » Tue Jul 22, 2014 3:15 pm

Further to my little saga. Chnged a few things but still have an irritating condition. t seems to be worse when hot. In particular idle is difficult to predict. i.e. it will sometimes stall at junctions off the thottle, or drop of & die.

Sometimees its OK. Good news is its got a gold ECU so no restrictions

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