can't start in the cold.

[Marsh]

You guys have given great advice in the past and I know I can trust it.

I am working on a 1987 Yamaha Banshee 350. It has RZ350 cylinders and heads on it. In there,the power valves on the exhaust side are rigged to stay wide open. Would this add to the problem I'm having where it will not start in the cold unless I dump fuel in. With lots of fuel its starts and runs fine everytime! This thing starts and runs fine in the summer but winter it will not start.

I know what my KDX200 felt like when my KIPS were all melted and basically open all the time but I don't remember it being hard to start.

An input here would be much appreciated. Any other site to look to would be good too.

Will an open all the time exhaust valve cause poor cold starts(2-stroke).????????

Marsh

 

[adam728]

A few things.

Power valves stuck open will cause the compression ratio to be lower. Low compression = more difficult starting. That's one issue.

The second is jetting. Did you change jetting for cold weather? Properly setup it should only be slightly harder to start when it's freezing out that when warm.

 

[ridejunky]

Hows your reed valves looking?