DannysZ28 Posted August 22, 2009 Report Posted August 22, 2009 I just changed from fatty to some cpi inframes. I have 30mm carbs. I changed the main jets from 155 to 160s. Now when it gets into the powerband it starts to sputter or miss. Its not backfiring, just seems to sputter and not pull that good in higher rpm. Runs great at lower rpm and has good throttle response. Any suggestions??? Quote
locogato11283 Posted August 22, 2009 Report Posted August 22, 2009 what do your plugs look like? sounds like you might have gone up too much. maybe your 155 was already too rich for your fattys. Quote
DannysZ28 Posted August 23, 2009 Author Report Posted August 23, 2009 what do your plugs look like? sounds like you might have gone up too much. maybe your 155 was already too rich for your fattys. My problem turned out being a wire on the coil was making a bad connection. My 155s were good on the fattys, I had them checked on a dyno Quote
rmkboxer Posted August 30, 2009 Report Posted August 30, 2009 the cpis run better then the fatties, they are a more efficient pipe settup so you will need to drop your mains. if it was me I would drop them til it stops sputtering. then you can check your plugs and fine tune it. Quote
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