2009 Rmz250 dies

[justeg450r]

Hey guys got rid of my kawi and took to long of a break from riding but just bought a new to me bike. I picked up a 2009 Rmz250 for $1300 i think i got a ok deal. It needs serious tlc but that’s the stuff i love so.. Anyway the bike has good compression and starts good but only runs for a minute then just dies. Runs non stop never misses a beat with the choke on. Back fires a very little when you give it gas with choke on (i’m guessing because of the excess fuel?) but as soon as you take the choke of and give it any throttle falls on it’s face. Cleaned the tank cleaned the carb it all looked clean. Could it be valves? Is it the carb? It sounds like a main jet is clogged up but i could see through it when i pulled it out. So i don’t know where to go next. Any ideas? Thank you help is greatly appreciated.

[mlatour]

Apart from plugged up slow jet / fuel screw circuits, you could also suspect an air leak. 

A cracked plastic hot-start nut is a common problem.

Edited November 8, 2019 by mlatour

[justeg450r]

Oh ok i’ll look at that when i get home thanks[emoji120]

[shrubitup]

I would also replace pilot jet. Don't bother cleaning it if the bike ever saw pump gas with 10% ethanol content and then sat unused for weeks on end. 

[justeg450r]

I would also replace pilot jet. Don't bother cleaning it if the bike ever saw pump gas with 10% ethanol content and then sat unused for weeks on end. 

I was actually told it sat in storage for awhile. So should i do a carb rebuild?

[shrubitup]

1 minute ago, justeg450r said:

I was actually told it sat in storage for awhile. So should i do a carb rebuild?

I'd replace pilot, leak, and main jet then. Less than $20 in brass.

[justeg450r]

I'd replace pilot, leak, and main jet then. Less than $20 in brass.

Ok sounds good.

[bweighmaster]

Clean it by heating it up with a small propane torch .   Does'nt take much to burn out the crap ...

[Imposing Will]

Check float height when you have it apart to clean.

[justeg450r]

Clean it by heating it up with a small propane torch .   Does'nt take much to burn out the crap ...

Was that a joke? Because i actually laughed at that.

[shrubitup]

1 hour ago, justeg450r said:

Was that a joke? Because i actually laughed at that.

Ya, for the price of a large pizza and pop you can buy new brass. Way more value there. 

[bweighmaster]

Maybey  you should try it .    Obviously you have 'nt . ......     

[bweighmaster]

Must be ktm owners ......

[bweighmaster]

Notice ........  No reply .          

[justeg450r]

Notice ........  No reply .          

I’m sorry I’m still kind of shocked was that a legitimate suggestion because I’ve showed it to all my motorcycle buddies and it’s got a laugh every time.

[bweighmaster]

18 minutes ago, justeg450r said:

I’m sorry I’m still kind of shocked was that a legitimate suggestion because I’ve showed it to all my motorcycle buddies and it’s got a laugh every time.

Think about it ,   what do you do with gas ?   Burn it .  You don't have to get it that hot to burn off the residue .....  then use a guitar string to finish ...   don't doubt me ,  been doing this stuff over 50 yrs...

[bweighmaster]

The jets ,  not the whole carb !

[justeg450r]

The jets ,  not the whole carb !

OK that makes sense that’s not what you said though[emoji23]

[bweighmaster]

I did not say ,    They were dicussing jets ,  I thought most people could figure that out .....

[justeg450r]

I did not say ,    They were dicussing jets ,  I thought most people could figure that out .....

That’s cool i just misunderstood.