Postby locost220 » Wed Apr 06, 2022 3:09 pm
Thanks for the support guys, during the visit to BD you could see he was frustrated and perplexed as he has plenty of experience on 170, carbs, ME motorsport ECUS.
It was a case of far to much fuel at low rev rather than too little. His thoughts were could go with smaller idle jets (had none ) but should have been fine with what was there, he checked the basic cam timing as we did using the correct alignment tools and agreed were all fine as was the map but still said it felt like timings probably some cams the carbs cannot handle .
So last night I took the covers off the locost engine and a spare old ST170 engine I got to rebuild of unknown origin, with the intention of measuring the total height and width of the cams as a very basic check to see what was in the locost engine.
So using a basic digital vernier caliper it became clear that the cams, both intet and exhaust are different between the engines, but also it appears that what has been done is the exhaust shaft has been removed, modified had a trigger wheel fitted and put in place on the inlet side with an aftermarket exhaust camshaft fitted.
My thoughts are at this stage is to remove the cams out the spare engine along with the cam buckets and put them in the locost engine and try again. If all okay maybe in the future try the original throttle bodies I was trying to use beforehand.
I understand the engine used to have Jenveys probably 45 as opposed to the 38mm bike carbs I am using, maybe the ecu and jenveys could handle the cams
Locost book chassis, Undergoing testing post rebuild
Robin Hood 2B, keeping me sane
Sylva Leader, stuck to the trailer