September 9, 20241 yr On 9/2/2024 at 5:15 PM, lemur said: Carburetor can't work great if the bottom end seals are not great. I'd be inspecting the bottom end seals for signs of leakage on any 2-stroke engine that has constantly changing carburetor type issues. ... when it runs does it fire with a nice clear compression pop-pop-pop or does it have a ring-ying-ying engine sound ? I'm still on my idling problem. I can't describe the noise the engine makes. On the other hand, when the idling is about right at a slightly high speed, I just have to accelerate by opening the handle, for the revs to drop and the engine to stall. So I have to set the idle to a high speed and it's not easy to drive in the zone.
September 9, 20241 yr You should perform a pressure/vacuum test. There are many instructional videos on the topic on YouTube. This is the shortest and will show you the basic concepts: https://www.youtube.com/watch?v=kUmeyVcnZrs
January 9, 20251 yr Hello everyone. Have you tried any modifications to the Keihin 28 PWK carburetor? This involves enlarging the air and fuel ports.
January 9, 20251 yr 3 hours ago, robertthomas said: Hello everyone. Have you tried any modifications to the Keihin 28 PWK carburetor? This involves enlarging the air and fuel ports. They make that, it's called a Keihin 30mm PWK carburetor.
January 9, 20251 yr 1 hour ago, lemur said: They make that, it's called a Keihin 30mm PWK carburetor. Not exactly !
January 9, 20251 yr When my friend that rides Beta uses my fuel he notices it runs way better. Might have something to do with 98 octane and 1% oil that I run in my TRS bikes instead of his high test pump gas mixed at 80:1
January 9, 20251 yr in Spain where I live there is only 95. I put 1.5% oil as recommended by Beta. I still have problems with unstable idling.
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