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Old 06-16-2015, 09:13 AM   #15
bull   bull is offline
 
Join Date: Feb 2015
Posts: 257
Not going to try & change your mind.

It is a decision that you must make. I have enough experience with the different engines and can tell you from experience that your thoughts in #13 are somewhat on target.

When you increase the engine from 39mm, to 44mm or 47mm, there is very little that needs to be done to MOST carbs, IF you are using a stock 39mm head.

You gain a lot from cvt tuning them though.

Currently trying lots of different setups on a 50mm to get it to start & run just right. Even using a 5 gas to tune in the jets, which I am custom drilling. After the break-in I'm sure the jets will need some more fine tuning.

Then I'll start tuning the cvt.

As to which kit you buy, just make sure that it has the stock, thin metal head gasket. Bought 1 from John Dikov (valley scooter parts) that had a composite head gasket that created cam journal and chain stresses. btw- he does have the right gasket, but it must be purchased separately. and he has inventory and ships quickly.
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