Re: What's you cylinder head temperature?
My guess is high altitude would result is slightly lower temperature, mainly because of less hp. It might be kind of hard to tell how much though, because the ambient temperature would need to be the same too.
I am thinking less dense air might have much less cooling properties. Water boils sooner food cooks different. Thing is while I never measured my china temp officially. I am getting higher head temps on my Morini.
That of course is a given its not the same motor but I have heard reports that they might be running cooler in So Cal at sea level dunno? I got one report of 260? I keep juggling this figure of 30% percent into my thinking.
I just put a 21mm carb on my 9.4 and a good hard run might go any where from 290 to 350 at night here ambient temp about 89. These are constant real time readings from my
The temp fluctuates a lot at different speeds gas on gas off. I have never experienced any drivabiltity issues always ran great! I watch the temp a lot and have a LED alarm set.
Today at high noon I looked down and saw my blue smoke coming out of my exhaust so I mean I know I am not lean because full throttle will 4 stroke and my idle is rich red line is 3/4 throttle. When it idles and I rev it blue smoke.
390 is kinda the cut off point to me me thinks. 390 has pretty much been the hottest I ever saw it . When my jetting was wrong once when I first got it I saw it jumped just past 400 I just shut it down for a few.
June heat wave was ruff I ran the carby fairly rich but faired off nicely engine seams to have more power now than ever. I did some really longs runs temp was pretty stable and I never gave the motor a break. I can slow down by 10 miles an hour and see the temp drop right away. I have been clean across town in the heat wave at red line. To be fair about my report I am a big ogre sized 6' lumber jack guy. Motor had no easy task even with all manner of my cargo but did not ever complain.
This being my second Morini my old one still doing great. They have exceeded anything I have yet to see from previous china 2 smokes I have encountered. I have yet to wear one out. One motor with over 2000 miles miles the old M has 3500 miles . Still stronger and faster than previous Chinas were new to me.
Hi.. Ideal Running Temp measured at cylinder head is 375-385 degrees F. 410F is too high and will burn the motor up. Exhaust temp 1175 to 1185 is ideal. Measure 3.5 inches from Ring of exhaust port. Measure Exhaust Temp first, follow up by Cylinder head measurement. These are optimum parameters taken from Rotax 2 stroke motors using synthetic 2 stroke oil. Since our 2 stroke Bicycle Assist motors have such low compression, my Guess is that they run with less heat than the ideals I have posted. Enjoy the ride...