Re: Motobecane 70cc Airsal Engine Temp

Toledo Riot /
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> Ri E Wrote:

> -------------------------------------------------------

> Thanks so much for the great advice guys! I'm not surprised the head

> shares some of the blame for the higher running temp. I'll try to get a

> matching head since I lack access to proper machine tools. Also, thanks

> for also confirming my theory that mobys run hot in general.

You are absolutely on the right track with the head, HOWEVER, its a pretty common misconception that mobys have to run hot, its all about tuning

First yes get a new head, the even re-worked the fins on av7 heads are small and work poorly, get an av10 head, the Polini heads work well but have a pretty aggressive squish, if you double up the head gasket it will lower the compression and help you cool properly, the Parma head also works real well

Something that has also not been yet mentioned is a pipe, stock works well for 50cc's but an actual chamber will help get that heat out of the motor

Next jetting, I love me a sha but a multi circuit carb will allow you to tune for each portion of your throttle, if you wanna keep the sha, the UpJet 3d printed sha slide will help as it moves a lot of your top end throttle onto your main jet and away from the slide

Timing seems like your fine, I run 1.1mm btdc on my aggressive bikes, 1.4mm on less speed oriented bikes

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