I have rebuilt an Allen scythe and it is 4 stroking quite badly. In thick heavy grass it runs cleanly and pulls well but under light running it 4 strokes and then when you come to a heavy patch it hasn't got time to "clean up" and sometimes just bogs down. The engine has been completely rebuilt (at great expense)so if it will run cleanly then it can only be an adjustment. The three things I can adjust are : mixture, rich/lean timing, advance/retard and plug heat, hotter/colder I had a champion D16 plug to start with and have tried a D14 which I believe is slightly hotter running and seems slightly better. Would a NGK plug be any better? which way should I try adjusting the timing, advance it maybe? Regards, Kev
- posted
19 years ago