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Old 12-02-2012, 02:07 PM   #1
MiteyF OP
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Joined: Jul 2010
Location: Michigan... temporarily
Oddometer: 1,868
How hot is too hot for a smoker?

I've owned plenty of smokers in my short-ish time as a motorcycle enthusiast, mostly vintage air cooled.

I recently picked up a 1966 Suzuki S32-2 (150cc 2 cylinder) which had not run since 1984. After cleaning the carbs real well, and sourcing a new gas tank and battery, she fires right up, and runs great.

When I pulled the carbs apart I set the floats, cleaned everything thoroughly, and reassembled. At first the left cylinder wasn't firing, I cleaned the exhaust out on that side (FILLED with oil) and ran her, cleared her out, and leaned the carbs out a bit (to around 1 3/8 turns out) and both seem to be hitting well. While I haven't actually checked compression with a gauge (don't have one in the tool box ATM) both seem to have good compression via the old finger-in-the-plug-hole method.

However, after even a short ride around the block a few times, when I come back to the house, the heads/jugs seem pretty darn hot. They steam a bit, which I think is just burning off the little bit of dirt/dust/etc that had accumulated on them over the last 30 years.

I have an infrared temperature gun and was hoping someone could give me, or direct me to, what a general range for head/jug temperatures are for a well-warmed vintage 2 stroke.

I know that many of them required high octane gas when new, which often times is not available nowadays. I'm running 92 octane ethanol-free at the factory recommended 20:1 ratio. Info on these old bikes is few and far between, as there are not many around anymore, and even fewer on the road.

If no temp ranges are available, is there any octane booster that actually WORKS as they say they do? I know most of these products are total crocks, and have never bothered using them.

Any help is appreciated.
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