Hi all
Sorry folk’s long post.
I have a Go Gen 4, 3PT, which I purchased a few years back new, broke it in by starting and putting it straight on the ground doing figure eights up hill and on grass.
I still have a lot of pinch very difficult to turn motor by hand, motor has 22 litres of fuel through the engine, worn out a rod and rear bearing in the process.
I have experimented with 2 other carbs, Nova and OS, the problem is that it lean bogs once I lean it out, If I lean bottom end do pinch test, as posted few pages back, then lean on HS needle it lean bogs once it gets to a race track, ideal cap is 0.5-0.7.
I can lean top end from flush 2 full turns with OS carb and 1.5 full turns on Nova carb. I can tune the motor in the park, it goes good, put once at the track after 5mins, ½ way through a qualifier it starts to carry on and lean bog.
If I tune the motor so that it does not lean bog , thus bottom end turned correctly then tune HS needle I have ok bottom end but down the straight I am lacking power dramatically, tuning in this manner does not get the motor hot at all, max temp would be 70c and does not produce sufficient power.
This motor does not exceed past 80c in temp max, leaned out.
My possible solution is to wrap the head in foil then put a heat gun on it till it reaches 150c to try and loose some pinch. Crazy! What do the Go experts think?
I have tried 3 different brands of plugs, LRP (6), Nova (C6), OS (P4), and will try OD(97T).
I have tried blowing this thing up by mixing my own fuel, using a 1 litre beaker used in environmental analysis labs +/- 5ml. I have played with 9-11% oil content 25-30 nitro and further purchasing premixed race fuel from the factory, none the wiser.
Am I correct in assuming that once the pinch gas gone then I will be able to gain optimum power and temps to lean out top end so I get it going moving down the straight without lean bogging. I presume because of the pinch its restricting me from gaining maximum power.
I don’t use temp guns I use the old spit and sizzle, problem is it does not sizzle, just sits there.
If anyone can help me getting this thing to about 120c without lean bogging, you would have greatly solved a tuning mystery.
