172 running stock carb with pm59 pipe and foam filter

Plus pollini variator and rollers
Just wonder at present wot the jetting on the stock 20.5 should be a bogs from easy pull away to 1/4 throttle then will clear and as soon as you release throttle bogs down again
Typhoon 125 engine with kit etc brand new

 

not 100% sure my runner is running 98 jet with open filter malossi kit and scorpion exhaust and standard carb

 

Agree with bashy, 98 to 100 is about right on the stock 20.5 carb. But you'll get more fun out the 28mm.
Less fuel..........but more fun.

 

there a really big change with the 28mm ? was thinking about a 25mm but fuel econ must be so bad lol

 

My sons runs a 183 kit with 25mm delly and 102 jet no filter, runs perfectl

The only real problem is trying to get any wear on the front tyre lol!

 

Just spent the weekend rebuilding a 50 zip with 172 cc engine in it, oh joy! Anyway all done inc rewire ,same again delly 25mm carb with 102 main no filter and pm pipe, runs mint.!!

This one has a malossi mhr crank and we are using an NGF KIT which ive had to fettle, ports were rough but tidied up ok and the only other problem is you must check threads , exhaust and spark plug, the threads are cut but are not perfect so just run a tap down them to clean them up. Not a bad kit just need a little work, easy enough to put right and very good price.