Got a PX125, spent sh** loads of money on it over the 2 weeks to upgrade some parts. SIP chrome rims, Michelin sport tires, SIP caliper, Zeus CDI limiter and Malossi 166 bore kit. I dont know much about engine and the shop here in Tokyo said no carb needs to be changed, all they did was swap the cylinder head and made a small hole in the air filter area. Not sure what jetting they set it but they claimed that Malossi is too racey for the streets.
So, they tuned it down to make it easier to ride. Since they said they have worked on these bikes for over 30yrs, they didnt run any test run.
To make the long story short, I went on my own journey "test run" thru the busy streets of Tokyo. I found the 1st & 2nd gear very boogey and sluggish. But 3rd & 4th brings tears of joy as it could pass cars and zig zag traffic like a hornet. Somehow the bike smells like gasoline at every single traffic light. (running too lean?) I figure with my SIP road sport exhaust on a 125cc could hit 100km, I figure hitting 90+ on 4th gear shouldnt be too much. (Knowing now its a 166cc)
Then the bike died. Engine seized & had to push 12km back to the store. They found that I scored the cylinder during break-in....
I thought the Malossi is well-known to last?
Anyway, bike is back in running after they oiled it with ZOIL synthetic. However, it occasionally stalled during start up.....compression rate? idling too low? Anyone have ideas/suggestions?