NO!

I agree w/you on the possible causes for backfiring. But remember one thing when working on anything 99% of the time the root cause of the problem is something the owner\previous mechanic did incorrectly.
 As for the air changing I would beleive that if we lived up north where it gets cold and stays cold,and the unit in question was a 2-stroke but its not. In all my years of wrenching I only came across one bike "2-stroke" that was tempermental to temperature change.
 
 It's all good, if he takes his time and cleans the carb real good the problem should be fixed. Then again neither one of us can hear it or see to properly diagnose it.

   -Jason   

svt, no disrespect here, but they come a little lean from the factory for emission reasons for importing. If they came over that lean then they would be lined up at the dealer for burnt pistons & valves under warranty.

 sources? over 25 years of working on them.

-Jason

The brake drum is grooved. Go through the the adjustment hole on the drum & back off the shoe adjusters and the drum should come off. If that does'nt work try backing off the bleeder screws and compress the wheel cylinder prying against the brake shoe with a small flat blade screw driver.

  -Jason

I agree w/trx, it's no new model 400 but it 's a very good machine for starters, and there are parts galore for them. As for the seating position when I had mine I shaved the seat alittle bit & put a pair of renthals "w/honda bend" and that made it a little better.

-Jason

You should'nt have to rejet if it's all stock. If it has a pipe & filter on it then yes you need to rejet. It is possible that he did'nt clean the carb good enough.
  -Jason

Were they sitting for a period of time before you bought them? Does it idle o.k.? If so I would start with a good carb. clean, cause you said you rode it for about 30 min. then it started acting up thats sounds like something in the float bowl.

 -Jason 

Anything can be done. the only problem,is the final drive on these bikes is part of the engine. I don't know if the mounting tabs for a front diff and all associated parts are there.Not to mention the diff lock cable and the four wheel drive cable.You're best bet would be to just look for a old king quad that runs and go from there,or just keep saving money to buy what you want. Jason

Yea Ida the pic. only shows half of it. It usually takes me about 4 days to do the inside and outside-of the house, it's no doubt alot of work. thanks for the compliments. Jason

I don't post alot, But I just wanted to wish everyone a Merry Christmas and a Happy New Year. Click on the link and check out my light display

http://www.floridatoday.com/apps/pbcs.dll/gallery?Site=A9&Date=20061221&Category=HOLIDAYS&ArtNo=1220005&Ref=PH&Params=Itemnr=10

Jason

Havent posted in a while. Does anybody have any 1985 big red forks for sale? p.m. or email me.
   
           Jason

looks like the wire for the neutral light/safety switch

Go to your local automotive electrical repair shop, they should have a motor that will fit for about 30.00 to 40.00 buck's. It will have the same plug also.  Jason

Plug the vent on the carb. float bowl, the one that hangs down below the bike. That should take care of you're problem. Jason

It kinda works like intake and exhaust, with just one vent it won't work. Jason

Might as well remove the suspension and electronics also,cause they are manufactured in japan and other countries as well. Jason

Did you go one size over on the piston and rings, or did you stay stock bore? If you went one size over a hone isnt gonna do it,you have to bore it. If you stay stock measure the ring end gap with new rings and see what ya got,and go from there. Ask your friend's dad he should know what to do.

I was with my little sisters it was soo BORING!

  OK I'm done you guy's have fun w/this one. Jason

A little old to be picking on the youngins?  Leave it to me, 04250 and RL400 to pick on them.

   Don't even think of it champ. I'm married w/2 of my own.But that was a good c/b.  Jason

Come on! 10 views in 10 min. somebody say somthing!!!!!!!!

Did you guy's go trick or treating tonight ?? :

Like it should twist. You shoud not have movement up & down or side to side. Jason

The tie rod it self won't be loose. The tie rod ends will be. Check those they should'nt have any play. Jason

Look in you're owners manual, there should be a maintinance schdule. Jason

What year kodiak? if it's a 93 thru 99 , it's full time 4-wheel drive and it's normal to have "hard steering". Jason