May 31, 20188 yr I've just moved onto a Sherco with Keihin PWK carb, from a GasGas with Dellorto. I'm finding the throttle very light on the Keihin and a bit easy to wind on too far! Does anyone know if there is a stiffer spring available? Or perhaps a spring that could be coerced to fit? I've had a search but not found anything that mentions being stiffer. In reality I probably just need to get used to it, but I reckon I'll scare myself less with a throttle more suited to a heavy-handed user.
May 31, 20188 yr Ask the Splat shop guys. They do lots of bits for these carbs ...... https://www.splatshop.co.uk/bikes.html
May 31, 20188 yr i had a medium and strong from Japan the only ones i could find ,have a look here https://japan.webike.net/products/369551.html Edited May 31, 20188 yr by mikegas
May 31, 20188 yr Oh and one more thing as Adam Raga says the left hand needs to be accurate , the right hand you can get away with !!!
May 31, 20188 yr Author Mikegas - thanks for that lead on springs. Have you tried them out? Any comments on how much difference each makes? I expect the medium is all I'm after. anotherfive - hadn't thought of that - is there room in there to pack out without restricting the slide opening? And as for Raga, therein lies the problem - the left hand is accurate OK, most often accurately in the wrong place! This makes it hard to get away with the right hand.
June 1, 20188 yr Author 49 minutes ago, copemech said: put a slow throttle tube onit ffs! that is what they are for No, I don't want it slower, I want a bit more feel against the spring - just what I've got used to I guess. Feel and response are different things I reckon. Just like slowing suspension compression damping isn't the same as stiffening the spring - well sort of similar anyway.
June 1, 20188 yr Funny there was a guy easing a Dellorto, I've never ever thought of stiffening a kehin. What is your problem? You wind it on too much?
June 1, 20188 yr Take it out & stretch it a bit. Typical trials rider cheapskate mod !!!. ( in a similar vein : If too stiff, cut a few coils off.) Has worked for me for over 40 years.
June 1, 20188 yr Author 2 hours ago, nigel dabster said: Funny there was a guy easing a Dellorto, I've never ever thought of stiffening a kehin. What is your problem? You wind it on too much? It just feels too loose/light. I reckon I can control it just the same as the Dellorto, just not the same feel. A feedback thing I think - doesn't feel like there's any feedback through the hand. I swapped the S3 grip for a Renthal yesterday - the S3 was bigger diameter. That has very lightly improved the throttle feel, although I quite liked the larger diameter for my hand size. Probably should just get used to it like thousands of others have. Apparently the OKO springs fit and are a bit stiffer, so a couple of options now.
June 2, 20188 yr I think you should be connecting motor to hand not hand to spring. A lighter throttle is much better for prolonged use
June 2, 20188 yr If you get an OKO carb spring (they are a copy of the Keihin) they are significantly stiffer than the Keihin spring. It's a good and easy conversion.
June 2, 20188 yr I'd suggest waiting. You'll get used to it. I can't ride the Dell'orto, the throttle is insanely heavy to me. Which is to say again, you'll get used to it.
June 3, 20188 yr Author Thanks everyone. 2 options I'll keep in mind: Do nothing. Or try the oko spring in a month or so. I'm sure this is just a personal preference thing, no right or wrong answer. For a few dollars it's no big deal to experiment anyway.
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