MOPED ARMY

Listen to Don , plus a new cylinder/piston could take from 100 to 600 miles to break in so do it at half throttle and by all means do not put hi test gas in it ,,, it burns hotter and breaks down the oil worse so it will do more harm than good!! Rog

Yeah,Ron.Good advice.I didn't think he was lean because of the hard cold starting,but it's a possibility.Those kits do need a big jet.And richening the oil mixture actually leans the set-up.

Jimmy,

I'm confused by the shorter plug. Is the threaded portion shorter, and if so, did you replace the head? The plug threads should be the same length as the thread depth in the head, is tis true of yours?

Ron

Thanks for answering, guys... what I meant by a shorter plug is that he changed my plug from an NGK B7HS to a B6HS, I believe it is.. it's a colder plug, the metal arm coming off the bottom of the plug is shorter....I have to really peddle my bike like hell now to get it running from a cold start..but once it warms up for even a minute it can restart very easily.He did that because I think he was worried about the new larger piston hitting the bottom of the plug, so he opted for the B6HS with the shorter metal arm..

I had this mod done to my Avanti moped....so far gets about 5 mph increase in speed...If it loosens up and lets me run at full throttle without overheating it will be a great moped to keep up with traffic ..I think everything is tight yet because she gets real hot when I go up-hills. I've driven about 90 miles and it may be starting to loosen up a bit...But it's frustrating having to run at half-throttle, ain't it ?? !! Still, at half throttle she's doing about 25mph so it's not like I'm dragging too bad...my old Puch only does about 24mph full throttle :)

I'm still using the old carb,I won't opt for a larger carb until this motor proves to me that a break-in period will let run at normal temperatures.

I was just hoping that I might hear from others who have had a similar piston kit put in and that maybe they had to run theirs at half-throttle for a few hundred miles also before their motor loosened up and ran at normal temp ?

Jimmy

Thanks Fred... if the B6hs he put in there creates more heat,then I am going to try the older B7plug in there to see if it reduces the heat any..... I don't think it'll become toast though.....I only run at half throttle and am not allowing it to over heat too bad....

Ok, I did a plug chop and everything looks good....well, I've found out what caused the over-heating ....the dude that put in my cylinder had changed my plug too...he put a hotter plug in and the sucker was over-taxing my motor !... he kept my old plug, a champion plug that I can't find in my area, so I couldn't put my old plug back in to try it...... on the way home today I stopped at the auto parts store and found an NGK B7HS, a colder plug ( thanks Fred for making me clear on that! )

And today my ped ran awesome..man, what a big difference a plug can make.... I rode 35mph with no over-heating, and for giggles goosed it up to 40mph a few times....downhill she wanted to climb to 50mph , I got nervous and just backed way down to 35mph again....yeah, the colder plug was exactly what I needed...this is plenty fast enough now for me to make my 30 mile work commute every day....guess I won't need a scooter afterall :)