KR-1S.co.uk Forum

Recently bought another kr1s 1992, the problem:
Runs ok-ish but not happy up to 5000rpm, from there to 6000rpm it's an absolute pig! .... not backfiring but close, hicking and objecting, you would think it had a loose HT lead or running half choke on a warm engine. Once it hits 6000rpm it's fine and revs happily, if I hold it on part throttle in the 5 to 6000rpm band it feels like it's running out of petrol. On the open road you can avoid all this but when you hit traffic it's bloody dangerous.
THINGS I'VE TRIED:
Cleaned carbs, ( no change )
Fit new plugs, (problem has improved but still not right)old plugs were perfect colour when removed.
Swapped the CDI for a known good one ( no change )
If I have to take the petrol tank off once more I'm going to launch it down the drive.
Alan

Sounds like blocked pilot jets to me. You should be able to blow down each one when then are removed quite easily.

they do run rough at that engine speed

i found putting the circlip in the needles top slot smooths it out - costs
nothing to try it before you start spending money

of course the only thing is you'll have to remove the tank again

deffo pilots, right rev range, symptoms the lot. just suffered same thing until i swapped pilots it went away, it was like a horrendous flat spot.

My other 1s now in a million pieces , was no ball of fire at these revs but it would drive through this feels sometimes like it aint going to make it to 6000 . Ie pull away from a junction plenty gas drop the clutch halve way accross the road ch ch chchchc hoop wah borrrrrre jesus christ on a bicycle.... the traffic's coming 6000 were away.
unless I abuse the clutch !!!!!!!!!Is it me If thats the way it is then tell me
previous recent bikes ns400r, rd350 f2, yam 200 electric, francis barnet falcon 2t, ...... present bikes. 2 1/2 - 1s's, szr 660 out on loan. Aprilia caponord most used .

Who said remove the tank again c'mon who was it You swine

have you tried coil n leads?...

have you tried coil n leads?...
Only if it can be done WITHOUT REMOVING THE BLOODY TANK
Do you fancy a holliday in northumberland

gotta go n c nosexup's on sunday(weather willin) and virgie on monday....but could post u a good coil n leads to try if it helps (but i will need em back...sorry)......

would put my life on it been the pilot jet either varnished up or blocked, if you have a spare the same size swap it about, better still swap em both sides as you have 50% chance of swapping the one thats ok! the rev range you described tells me everything. take em both out and blow thru em, this way you will find the offending pilot as it will be more restrictive, maybe by a tiny amount but enough to cause mayhem with the fueling. unfortunatly you will have to remove the tank unless you have fingers 7ft long! sorry

OK NEW pilots tomorrow ( still be available from kawasaki
Thanks for you interest top blokes
Cheers mr bungholeo iv'e got spares but lack the will.Still tomorrow's another day......I think making love 4/5 times every night is taking it out of me as I get older

You shouldnt need new ones just to test it, Clean them out make sure they are a #40 size and away you go. Mine bogs down a little as i have #45's thats to much fuel But as i only ever ride it flat out i dont care LOL

......I think making love 4/5 times every night is taking it out of me as I get older [/quote]

You'll be single then

Cliff wrote:......I think making love 4/5 times every night is taking it out of me as I get older

You'll be single then [/quote]

Or he's shagging someone else's wife LOL

I thinking im getting some orund the 15th...................actually thats pay day as well!!!!

RC , my pilots are 38 's




Hey Cliff you calling me a w£$%er ..........