Thread: 4 stroking
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Old 05-04-2014, 04:54 PM
rogergendron1's Avatar
rogergendron1 rogergendron1 is offline
Motorized Bicycle Elite Member
Join Date: Sep 2013
Location: woburn ma
Posts: 882
Default Re: 4 stroking

i wont run ANY stock head no matter how its modded... well not unless you plan to weld huge cooling fins to it lol !!! especialy one with no squish band and shaved down for higher comp ratio !

i run damn near 13:1 comp at close to 9,00o rpms and my bike runs like a champ ! its all in the carburation and tunning and oil mix......

i run a puch 70cc high comp head and a thin .4 mm head gasket on a decked jug with a close squish clearance, balanced and lightened top end (wrist pin and trimmed piston) with a larger 16mm bore intake intake and a 16mm carb......... no reed conversion....

and trust me with the higher comp you will want it running a tit bit rich, you see a piston port 2 stroke should break into a light four stroke on a flat with no load on the motor but snap right back into a crisp 2 stroke when the throttle is cracked. that is the proper tune for a piston port 2 stroke. also if you plan to turn higher rpms or higher comp you may want to go with a LEANER MIX,that means more oil in the gas and run a larger jet... 32:1 is leaner than 100:1 and requires a larger main. 100:1 is a rich mix 32:1 is a lean mix most people think its the other way around but its not .... adding more oil LEANS OUT YOUR MIX !

ohh and the best plugs i have found for high comp is the nkg b6hix and nkg br6hs and champion l86c ... the nkg r type is a resistor plug and will help if you get interfearance with your speedo, the nkg b6hix is a great iridium plug and should be used with high comp heads and the best plug for the stock head i found to be the champion plug
here to stay and compleatly insane ! deal with it lol

Last edited by rogergendron1; 05-04-2014 at 05:02 PM.
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