99 2x4 sport400 rev limiter bypass

[Bignasty1]

This unit was brought to me this way with a new carburetor on it and read valves it fires up cranks fine but it won't accelerate I push the button in on the override it backfired and blow the head or loose from the spring at the head I'm figuring it's a CDI issue or bad switch or something I just want to bypass it all together and see what happens anybody out there got a clue I'm being told that it will live after I eliminate a wire which wire is what I need to know

[Mech]

What make of bike is this Big ?

Do you know what the over-ride button is meant to be over-riding ? It could be a start inhibit over-ride...  so it can start in gear ?

And.. have you checked what the spark-plug is like, checked the exhaust isn't blocked, checked the fuel flow, or tried cleaning the carby ?

Have you checked the charging system is charging and regulating ?

Any of those things could give the no rev symptoms. 

[Mech]

I had a read.. I'm assuming this is a polaris sort 400..

You might have a switch in the throttle on the bars that is playing up, or the throttle cable may be adjusted wrong.  To test those and the limiter control unit they say to disconnect the black kill wire from the cdi unit..

You should geta a service manual and have a read.. 

[Mech]

There's a manual in the service manuals section of this site.. It's called "1999-2000 service manual"..

Up the top, "more", "atv service manuals", half way down the new page that opens you choose your make..  

Page 602 in the manual....

[Gwbarm]

Sounds like the timing advance is not functioning correctly, so I would also guess CDI , a little confused at what you are trying to bypass.