hey all i have a 2000 ac 500 auto that i inherited from my grandpa
been using it to get around town to save on fuel
after about a week of errend running it started backfiring when i let off and bogs down when i punch it, cleaned the air filter and carb, changed the plug
still no change, any help to point me in the right direction would be great
on a side note since im running around town 90% of the time i was wondering if anybody has put car rims on their machine?
i need a 14" rim with a 4x 115 bolt pattern and not having much luck finding anything to fit

 

Welcome!

I've heard/read somewhere's that you need to look for FORD FESTIVA rims. They're 12x4.5" which converts to roughly 12"x114.3cm. Not sure if you can get a 14" rim with that spacing, but look under TOYOTA. Try this website:

Ford - Vehicle Bolt Pattern Reference

I think backfire is caused by preignition in the combustion chamber. The momemtum of the quad is moving the piston and since it's dragging, the entry of the fuel/air into the combustion chamber pre-ignites when the rotation of the crankshaft is deaccelerating. If the fuel mixture is too rich you'll get unburnt fuel building up in the muffler. The easy way to tell that is when you accelerate you'll see a dark black smoke coming out of the exhaust.

Try these:

1. run some SEAFOAM thru it to clean out any gum'd up debris in the carb & cylinder.

2. This one will cost $$$ - It could also be a TIMING issue. If your quad has ++ miles it most likey needs the valves adjusted and the timing chain tightened. - talk to an AC dealer.

3. check to see if you can adjust your carb jetting and "lean" out your primary (usually about 1/4-1/2 a turn) Here's a manual go to page #14:

http://www.worldofpowersports.com/oe...20-%202000.pdf


4. Also check all your carb vent hoses to ensure they're not cracked & broken. If the carb isn't venting that could lead to back firing too.

Hope this helps
Good luck. My .02¢

 

What color was the plug or is the plug?

My guess is that backfiring is from running rich and it is black?

If that is the case then you need to clean the carb again AND flush your fuel tank.

Air/fuel screw setting is 1-7/8 turns out.

SJ

 

SeaFoam would be a good idea, then make sure your valves are in spec, then a new carb kit. That is what I would look at doing. I have a 2000 500 auto too

 

ill try adjusting the air fuel mix tonite the carb is spotless, venthoses in great shape, the plug was only a slight brown,

 

adjusted the valves and set the air fuel at 1-1/2 seemed to be ok gunna throw it together and take her for a test wreck yet tonite

back from the test wreck lol thanx guys it seems to be back to normal now-