KR-1S.co.uk Forum

I don't normally post but thought I'd share. They supply them in larger sizes also but I'm sticking to the std size as it's going to be a summer fun bike.
They look very similar but are not handed so the idle screw could be an issue, has anyone tried these?
I'm going to take a punt on them as mine are worn really bad between the slide and body.
I plan to transfer all the jets and needles over (if they fit) and hopefully the choke plungers.
Item number :-112219011996
Sean

Just looked at them , three have been sold, maybe a triple owner!!!
Why does it say you would have to run premix if using on a two stroke?

Probably because there is no Union for a two stroke feed to the carb, not a problem on the KR1.
Sean

Sean7r wrote:Probably because there is no Union for a two stroke feed to the carb, not a problem on the KR1.
Sean

There are a few people who have used them on the RD forum and added a feed in for the 2 stroke oil, from what ive read, they seem to work well after some set up.

Ill update next week when they arrive. Hopefully post a couple of pictures.
Sean

Ive now have these carbs here, sorry about the quality of the ipad2 pictures.

Couple more.

They look OK...Be interested to hear how you get on with them when fitted.

Cheers.

No worries, I'll be testing them during the week. If anybody requires any more information/measurements let me know.
Seán

Koso carb fits the air box rubbers and intake rubbers perfectly, so do the choke fittings, the flexible idle cable is a different thread so I'll have to make an adapter, I've adjusted the air mixer screws to one turn out, and these were stiff to turn, so I removed them first, blowout the hole (and the rest of the carb)and refitted, this seemed to loosen them. I'll updat soon.
Sean

I've brought a pair in November haven't had a chance to open the box to them yet
Been to busy with work,thanks putting them on here can't wait to see if they run ok bud

Cheers Mike

Had a play with a thread gauge, the kr carb idle screw is m4 0.7 pitch, new carb is m4 0.5.

Sorted, everything bolted up perfect, I ran a remote fuel tank, gave it full choke, and the kr started on the third kick, I balance up the carbs, gave the throttle a couple of blips on the throttle, and it settled straight back down, I'm impressed, I then built the kr up for a trip round the block, well I've not ridden a kr for about 22 years, but it went ok up to 6000rpm, I'm running in a crank and two rebores and I've got the power valve cables disconnected. I still need to drill a vacuum takeoff for the fuel tap.
Sean

sounds very promising mate.