I went for a drive earlier, an hour in with no hicups and then suddenly its making a bawking sound on full throttle, theres a lack of power and its
struggling above 4500rpm
the engine is a 98 cbr900
i got home and checked for a spark, all present
took bottoms off the carbs and cleaned out
tried with and without air filter
new inline fuel filter
still has the same problem
any ideas?
getting rather sick of this car now 
track day on saturday too!
What's bawking?
stuttering
Baulking?
quote:
Originally posted by SteveWalker
Baulking?
quote:
Originally posted by Matt21
I went for a drive earlier, an hour in with no hicups and then suddenly its making a bawking sound on full throttle, theres a lack of power and its struggling above 4500rpm
the engine is a 98 cbr900
i got home and checked for a spark, all present
took bottoms off the carbs and cleaned out
tried with and without air filter
new inline fuel filter
still has the same problem
any ideas?
getting rather sick of this car now
could be a good shout
is it possible to replace with a coil pack off any bike? or would it have to be a cbr900 one? chances of me getting a spare to try before the weekend
is slim
or is there a way i can test it? or rig up my multimeter to see what its doing whilst driving?
Assuming it was OK when you last used it, fuel etc good and no changes, then outside the box….
Reg-Rec failing
iv just replaced the reg/rec for a brand new one 2 days a go, it better not be that!!!
was running fine when i set off and hadnt had this problem before.
could you explain how the reg failing would cause the stuttering?
Fuel pump relay?-if fitted
no relay for the fuel pump, it seems to be ticking away just fine
something i had noticed though is the fuel filter (inline one) only has a dribble of fuel in it, though i guess the pump has filled up the chambers in
the carbs?
its been running fine like this before anyway
quote:
Originally posted by Matt21
iv just replaced the reg/rec for a brand new one 2 days a go, it better not be that!!!
was running fine when i set off and hadnt had this problem before.
could you explain how the reg failing would cause the stuttering?
it better not be that!!
voltage sits at..... 14.8 i think it was, seemed high to me, but its very constant! it never changes no matter how high the revs go.
with it being a new one etc i assume that its all ok
i think il double check it tomorrow just for peace of mind/rule it out
im quite tempted just to buy a spare engine and throw it in as this ones giving me nothing but trouble lately
fixed.....
though i think il keep the problem to myself for now 
did you put fuel in it?
quote:
Originally posted by Matt21
fixed.....
though i think il keep the problem to myself for now
yes it had fuel in though it had crossed my mind on the first day of trying to find the problem....
In my defence.... I know bugger all about carbs....
when i took them apart to clean, I didn't want to tinker too much in case I made things worse, so i just took caps off and cleaned with carb
cleaner and cotton buds and put the caps back on, three times i did this!!!!
and I didn't once notice that one of the four main jets was completely unscrewed while the others were nipped up tight.
how I didn't notice I'm not sure, too busy looking for dirt than looking for loose bits i guess
at least now I know my fuel filter is new, fuel lines have no blockages, carbs are clean inside (and the jets are tight ) my coils work, ht leads
and plugs are fine, reg/rec is fine and nothing else is causing issues
bloody muppet
So all that's left to do is enjoy your trackday!!
Trackday thoroughly enjoyed
I even won a medal for the sprints! Most consistent times!
For six timed runs they were all within 0.13 seconds I think he said!!
It's no rocket ship, 1:16.01 was my best, got a 1:16.08 with a passenger too
That's not bad from a standing start! That Westfield that did a 64 at last years wscc blyton sprint must have been trying pretty hard