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Old 03-27-2013, 01:06 AM
16v4nrbrgr's Avatar
16v4nrbrgr 16v4nrbrgr is offline
Motorized Bicycle Elite Member
Join Date: Mar 2012
Location: North Bay
Posts: 1,711
Default Re: 2-stroke 'over heating' myth...

There's also a way you gotta ride them, blip the throttle a lot to keep it oiled on downhills, light load cruises, things where the motor would otherwise be spinning with only idle fuel flow going though at higher crank speeds. Maybe that's where the heat problem is arising, people are going along with steady throttle never giving the engine its oil, with cylinder and head temps fluctuating like 50 degrees between going at speed and idle, this can cause all sorts of weird issues. I have to conciously think to blip the throttle on long braking zones even though there's no downshifts, to prevent bad stuff. If you've ever seen the clip of James May wide eyed on the brakes hard and blipping the gas on an old Saab going down a steep hill, nearly crapping himself, you'll know what I'm talking about. Fortunately for us there's manual clutches and centrifugal clutches so its not an issue, its just a habit to form.

That must mean my lapped head is around 16+:1 because I had to take off a lot to get the lathe faced head to true out flat. Wow, that's crazy, 91 octane always it is!

I was thinking maybe carbon deposits or irregularities in the heads in HT's could cause hot spots in the cylinder if running lean already that could really turn into a predetonation meltdown situation, maybe that's what the deal is, and why some have had problems, others not, there's like 10 heads out there for HT's.
KTM50 Schwinn Chopper - 6000W E-Motard - 52cc Auger BMX - 9sp+CVT 52cc Cagllari Moped

Last edited by 16v4nrbrgr; 03-27-2013 at 01:08 AM.
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