1st understand what's going on or you'll throw money at it till it's fixed. I thought yogert taught you better.
Iono wrote on 05/25/11 at 19:08:39:My bike (LS400) will idle with no issues I can also drive in any gear if I keep the rpms down, but the minute I apply throttle the engine boggs down and will quit running if I don't back down and baby it.
Quote:I assumed it was a problem with the carb blocked jet dirty..., so taking off the tank in preparation for removing the carb, the only way I could drain the gas was to start the bike and with the engine running I could drain the fuel, the minute I turned it off the fuel stopped draining out..last time I drained my tank I did not have to do this... turn the petcock in any direction with the bike off and the gas would drain.
Yes you got a petcock problem, but not a cracked diaphragm. Fuel used to run with lever in any position, jambed shutoff valve. Now it'll only drain when bike is running, no longer jambed, working like it should. It maybe that your lever doesn't do anything, it's become disengaged from the valve.
Quote:So what do you think, leave the carb alone, clean repair the petcock or is it a carb issue, can the petcock cause this problem?
Thanks in advance
To your original problem I vote carb problem, possible that the main jet has fallen out or there's a washer under the jet that's gone missing and allowing the main jet and needle jet to be sucked up flooding the carb.
And take apart the petcock, certainly something wrong.
And BTW, it's a LS400, the guy is not in the USA. Didn't the last guy say he couldn't get raptor parts?