KR-1S.co.uk Forum

i think i have cracked the splutter in the carbs and it runs like a different bike on low revs now

All i did was change the airscrews for new ones
I looked at the taper on the old ones and they looked a bit chewed
so put in some new ones and hey presto.
I also put markers on the throttle so i could see where the splutter was and it was happening in between 1/4 and 1/3 throttle so small openings.

I can't believe though how much difference new airscrews made

Are kr1 needles the same as kr1s ?

would kr1 needles work in kr1s carbs ?

Are both variants 135 mains ?

Thanks
merry xmas all
T

Info on carb settings

http://myweb.tiscali.co.uk/teamsparrow/kr1stune6.htm

holy thread resurection Batman!

Yep a few years on and i seem to be greyer,balder and safter

Well those JJH needles IMO just aren't the right spec and went to the N68A needles which felt better straight away
Left them on clip #4

It needs somone to get the 3 KR standard needles and get the measurments and then compare them to the JJH etc needles.

I guess when you KR boys need to replace worn needles you too will have to find the equivalent needles

Not sure what the difference is HC but that link says the KR1S needles are N68X & KR1 needles are the N68A, had a set of each so put the Xs in on clip 4 here's hoping [-o<
As far as the comparison between these & JJH needles the diameter is the same for both but the taper for the N68 needles is fatter making them a leaner needle

When i had the JJH needles fitted ,from cold the bike kinda hit a wall at 4K until warm then was o.k.
With N68 needles fitted the bike never hesitated from cold so to me wouldn't that make them richer ?

Not sure but I would have thought that if the taper was fatter along it's entire length that would allow less fuel to pass by at any given opening making the mixture leaner

Yes you are right but didn't get that with my knacker