October 17, 20169 yr Not strictly Sherco but related. Is there any strip down or specification of the SPS Keihin carburettor on the internet? I have a RTL that I've tried to fit a PWK Keihin that has an awful flat spot at about 1/3 throttle and won't start. I've tried many different jets and combinations, but it doesn't get much better. This sounds similar to the early Sherco 4T and was solved by the SPS Keihin carburettor. I can find the parts on Splat shop, but noting about how the parts are fitted. I keep going back to the original Keihin PE carburettor, but this is now a challenge that I'd like to try solving, so this might be the next step.
October 17, 20169 yr Make sure first that the needle jet assembly is correct I've mistakenly changed the atomizer jet inside it around before and had a terrible flat spot
October 18, 20169 yr I rode a 4T Sherco prior to the SPS and it worked pretty well, however I think they still used a different atomizer tube on them. The SPS carbs became available to change them out but I am not sure it is practical to convert one.
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