> Mel FromZelie Wrote:
> -------------------------------------------------------
> We just redid my '77 with very a very similar setup.
>
> 70cc Treats party with the "custom cut sport/touring" head. 15mm bing
> (with MLM intake and air filter).
>
> techno circuit (not proma circuit) pipe - so close.
>
> Our timing is at around 14.5-15ish. 14-45 gears (stock). We get 38 mph
> out of it on the flat, max.. We have an 85 jet in it... it does 4-stroke
> a little at the top end- I have an 84 on order.
>
> My concern is heat - what temps are you getting? When I drive it up a
> big (and we have *steep* hills here) - we are close to 400. Normal
> operating like 340. I changed the front gear to 16, but it didn't
> really help with the heat, and really made it sluggish on take-off.
>
> Treats said it should be in the 320-340 operating normally... but we
> shouldn't be pushing the 400.
Our hills are on the steep side, The highest temp I reached was 385, it normally runs from high 200s to low 300s I was four stroking at full throttle down to an 83 jet I haven't done a plug chop yet but I will play around with jetting a little more. Also I read somewhere that guys are running in the low 400s with no issue.