4 Mill Issues?

[2strokeshees]

Having a few problems with my 4 mill. It fires up and idles perfect. As I rev it in neutral it seems kinda sluggish an takes a while to reach the high rpms. When I ride it, the low end is not bad but as I go to get into the powerband it cuts out and seems as if it is only running on one cylinder. On the left side cylinder it smokes like a chimney and the right side is clean. When I bought it the quad ran great and had great power. As I ran out of gas I went and bought my first 5 gallons of 110 Sunoco and mixed at 36:1. This is what the guy before me said he ran it at. Any help is appreciated.

 

A few things come to my mind:

Timing?

Carb syncing?

Piston or rings?

 

Just seeing if anyone has seen this or experienced this to get me leaded the right way.

 

Thanks

[Larry's Shee]

You saying the bike quit from no gas and then you bought more?

[2strokeshees]

Not sure what your saying. Normally when something runs out of fuel or gets low you put more in it... right? Or am I missing something?

[Larry's Shee]

What I ment was if you ran it bone dry you might have gotten some crap in the carbs. If they are stock carbs clean them one at a time as the parts are different, and don't forget to attach choke tube between carbs when done.

[2strokeshees]

They are aftermarket carbs. Both to appear the same. That was next step to pull them off and go through them, I etched a "L" and a "R" in each one so I know they go back on same side. The left hand side exhaust is very very wet, like running out of the silencer wet but right side is dry as all get out. I guess start at the carbs and work forward from there?

[guns4children]

Change your plugs! Then clean your carbs. Then go get some new gas and try that. Get back with your findings.

[2strokeshees]

Plugs are brand new along with fresh gas.

[Bkm2006]

Check spark. Could be a bad spark plug boot, or even coil. The first thing i bought for mine when i bought it before the rebuild was plug boots. Mine would run on one cylinder, put new boots on and fixed problem. Just cover all the basics, check spark, clean carbs, then sync carbs and so forth.

[2strokeshees]

So I tore into my carbs. No signs of dirt but still tore everything down and is sitting in carb clean. Only thing I noticed was my jets were almost a dark brown or almost a light black. I assume this is dirt or is this just from the race fuel. I cleaned them either way , just curious. My question is this. I live at 2600 ft elevation, I ride in coos bay oregon "sea level". Sand mountain "5000 ft" and winnemucca "little over 5000 ft".

 

My jet setup is same as I got the bike. The guy said it was jetted for sand mountain..?

 

Main Right side: 172RD

Main Left Side: AB172

Pilot: 58 both sides

Fuel Mixture was 2 out on right side and 1 1/2 on left

 

Both mains are 172 butt different ways?? Normal?

 

Let me know what you think.