Thanks for any suggestion. We are always listening...

It is not because of the small gears,it is because our engine has too big compression. It may happen when your engine use not more than one gallon of fuel. When the first gallon,the compression is too big. Everytime you start the engine,you need to loosen the grow plug a little. About half turn is enough. Then try to start the engine. Once the engine is started,tighten the plug soon.

I'm sorry because we want to produce a race level pull start engine,so we give you the race level piston/sleeve set. We want your engine lasting longer under serious situation. But it do make the engine hard to start no matter pull-start or roto-start. Remember to loosen the plug would help. We just don't want to produce RTR level engine,it's not our style.

You can check your engine,when you remove the plug it is very smooth. Once the plug installed it is unbelievable tight! It is a standard of a race engine. Maybe we should give you more shims but a lot of people don't know they need to remove shims after break-in....that's why we don't give you extra shims lately...but the gears issue pop-out....

Best Regards,
Dino