carb issues on my warrior

[jsmall]

Hi guys.
I have an 87 warrior, sent the motor out for UPGRADES a while ago. Had it bored, stroked, ported, polished, cammed, and resprung. when I got it back, it ran awesome. then I got married, had a couple kids, and never rode it. For about 7 years. (I know, and I am ashamed of the minus man points too). Anyhoo, I have been working on it and it is back up and running, but not so good. It starts immediately, idles well, and has good low rpm power. Then there is a very rough section of rpm's, the engine spits and coughs, but if you feather it just right, you can get through it. Then from about 3/4 to wide open throttle, it runs perfect again. The carb has been cleaned and recleaned, but I cant get it to quit that. Where do I go next? (I'm quite sure I must be missing something, but cant seem to find it on my own). Thanks,
John
PS any idea what performance issues would be from running too low a grade of fuel? (other than pinging, which I dont hear)

[bigcountrysg]

Originally Posted by jsmall

Hi guys.
I have an 87 warrior, sent the motor out for UPGRADES a while ago. Had it bored, stroked, ported, polished, cammed, and resprung. when I got it back, it ran awesome. then I got married, had a couple kids, and never rode it. For about 7 years. (I know, and I am ashamed of the minus man points too). Anyhoo, I have been working on it and it is back up and running, but not so good. It starts immediately, idles well, and has good low rpm power. Then there is a very rough section of rpm's, the engine spits and coughs, but if you feather it just right, you can get through it. Then from about 3/4 to wide open throttle, it runs perfect again. The carb has been cleaned and recleaned, but I cant get it to quit that. Where do I go next? (I'm quite sure I must be missing something, but cant seem to find it on my own). Thanks,
John
PS any idea what performance issues would be from running too low a grade of fuel? (other than pinging, which I dont hear)

For what you have done. You need to run premium fuel if not racing fuel. Ok you either need to rejet your carb, or adjust your air fuel mixture. I do not know if you are starving the engine for gas or choking it out during that point it runs rough. But it is an air mixture or jetting issue with the carb.

[jsmall]

I have changed the jets as suggested by the shop that performed the work when I had originally recieved the engine back. it ran good then. I guess I could try running it with a little choke to check if it is still starved for fuel.

I wonder if a bunch of octane booster would help?

??

[rajharley]

not to hijack this thread but.....big country...your avatar looks pretty gay in my opinion. LOL Please explain

[bigcountrysg]

Originally Posted by jsmall

I have changed the jets as suggested by the shop that performed the work when I had originally recieved the engine back. it ran good then. I guess I could try running it with a little choke to check if it is still starved for fuel.

I wonder if a bunch of octane booster would help?

??

What does the plug look like, is it white and ashy looking your running lean, if it is black and wet your running rich. If your plug is black and dry you should be good. Change plug with new one and run it for a while and see what the plug looks like.

[Banshee34]

Usually the plug should be copper colored if it's running right.

What about your needle Jsmall? Did you change the fuel filter from the gas tank?

[bigcountrysg]

Originally Posted by Banshee34

Usually the plug should be copper colored if it's running right.

What about your needle Jsmall? Did you change the fuel filter from the gas tank?

my experince with atv engines is that if it is running good then it will be black and dry. With no carbon build up.

Verrill: Plug Color Chart

[Banshee34]

Originally Posted by bigcountrysg

my experince with atv engines is that if it is running good then it will be black and dry. With no carbon build up.

Verrill: Plug Color Chart

Call me color blind but NORMAL doesn't look BLACK!

Combustion deposits are slight and not heavy enough to cause any detrimental effect on engine performance. Note the brown to greyish tan color, and minimal amount of electrode erosion which clearly indicates the plug is in the correct heat range and has been operating in a "healthy" engine.

[bigcountrysg]

Originally Posted by Banshee34

Call me color blind but NORMAL doesn't look BLACK!

I just posted a link to a spark plug color chart to help the man out some.

[igoslow]

Originally Posted by rajharley

not to hijack this thread but.....big country...your avatar looks pretty gay in my opinion. LOL Please explain

Can we really trust big country? Look at his pic

Anyway - something simple - have you ran a couple of tanks of fuel thru it? I had the exact set up on my 87 Warrior. After I let it sit I had to get a new carb.