Coast valve shimming info
Posted: Sat Jul 22, 2023 8:29 pm
A while back I had asked if anyone had info about shimming the coast valve. It had been in the tech section on this board years ago but was lost. Few remembered the mod and no one remembered the info.
Well, I took my old carbs apart and found what I was looking for. Such a simple mod which served the purpose of eliminating backfires, pops and stalls on quick strong deceleration. Mine used to stall every time I came to a quick stop. Very frustrating when you expect to takeoff and instead almost fall over. It also used to pop and farther on deceleration. This mod stopped all of that completely.
It involves adding a thick washer ( about the thickness of an American nickel), behind the spring on the coast valve. It needs to have a large enough hole to fit over the springs cradle. That's it....I can't seem to get the pics to post so here's links
https://ibb.co/9pR74L0
https://ibb.co/hXkMd1m
https://ibb.co/G719dpd
https://ibb.co/TKszVZ5
https://ibb.co/L54X1HW
https://ibb.co/k51Dhtp
Well, I took my old carbs apart and found what I was looking for. Such a simple mod which served the purpose of eliminating backfires, pops and stalls on quick strong deceleration. Mine used to stall every time I came to a quick stop. Very frustrating when you expect to takeoff and instead almost fall over. It also used to pop and farther on deceleration. This mod stopped all of that completely.
It involves adding a thick washer ( about the thickness of an American nickel), behind the spring on the coast valve. It needs to have a large enough hole to fit over the springs cradle. That's it....I can't seem to get the pics to post so here's links
https://ibb.co/9pR74L0
https://ibb.co/hXkMd1m
https://ibb.co/G719dpd
https://ibb.co/TKszVZ5
https://ibb.co/L54X1HW
https://ibb.co/k51Dhtp