425 magnum idles purfect give it gas 1/4 out starts to act like it is flooding out plug is new has black smoke coming out when it does this sounds like the limiter is on, push button to override it doea not change it any ideas

 

Is it popping(backfiring) through the carb? If so, cam is probably bad. Also, remove the black wire from the rev limiter and see if it goes away.

 

i dont think its backfiring feels like its getting too much or not enough fuel but i will try the wire thing and see if that does it

 

pulled wire off no change ?

 

it was sitting in storage for about two years would that damage the cam

 

Probably not. If it isn't backfiring through the carb then the cam could be ok still. it was a semi popular problem on some earlier models. Did you just get it running after sitting for 2 years or did this problem occur suddenly. If you just drug it out of storage I'd say your carb is varnished up and needs cleaned. That happens from sitting for long periods.

 

yeah i think that is whats wrong i think diafram is sucking air anybody know where i can get that stuff cheap

 

I'm currently working the same type of problem with my '95 425. I runs good up thru 1/2 throttle then bogs and pops when given full throttle. I currently have cleaned the carb twice, changed the plug, removed air filter, tested fuel pump, cleaned out fuel tank and lines, t-shot limiter. It ran good for test drive, then installed all removed plastic and air cleaner then started the same old problem. Going to check float level tomorrow.
I have a manual if you need one PM me. Almost ready to haul it to the dealer.

 

I had one that did much the same thing and it started rather suddenly. It would bog, backfire out the carb and the pipe and blow black smoke. I thought it was probably the cam but once I got it torn apart I seen that the carb body itself had broken across the top. I guess it was from vibration or perhaps ice formed up on the top of the carb after winter riding and managed to break the housing.

For the life of me I couldn't find a carb anywhere at the time. Not even a trashed old one to rebuild. I needed the machine badly and ended up buying a brand new carb through Polaris. Needless to say it wasn't cheap.

On the bright side however it really improved performance. I guess I hadn't noticed how boggy and lethargic it had become. It was like riding a totally different machine.

I'd check the carb thoroughly for cracks and loose parts and then rebuild it if necessary.