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JacobSlabach

Yamaha Big Bear 350 carb problem

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owner gave me permission to dig in.  Head is off.  Inside looks exactly like the bayou.  I'm thinking rings, valves, and a gasket set?  Should I replace the cylinder and piston also or just rings?  Trying to do it as cheaply as possible for this owner.  But if its not a good idea just do rings and valves, I'll get the whole sha-bang

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Inspect the cylinder walls. Look for scratches up and down as well as cross hatching. If nothing deep comes up then go ahead and get a ring kit. If the piston is okay then just clean it up.

Sent from my SM-N920V using Tapatalk

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ok.  how do you clean the piston, and also the head?  Its got black build-up and I'm worrying about the new valves sealing correctly.  I tried carb cleaner on the bayou with no effect... maybe oven cleaner?  I herd that stuff will cut through some baked on crap..  Maybe I could try it on another piston first (I still have the old bayou piston with crud on it)

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Try a soft wire brush. Nothing to crazy because you don't want to scratch the metal. I've heard simple green works wonders. Also you can try this stuff called awesome. You can get it from dollar general

Sent from my SM-N920V using Tapatalk

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The cylinder should be honed pit with a honing tool. I’ve attached a pic for you.  The pastor can be cleaned with starting fluid.   Def put a new set of rings in as well. 

7793C297-9404-4544-8C63-BE693CD02C31.jpeg

That honer goes into a drill and you go up and down the cylinder nice and easy at a slow speed.   

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Oh shit Frank. I didn't even know those were made. Can you bore with those too?

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btw, thanks to quad crazy for making this forum easy to use!  my bike's derailleur hanger broke and I was trying to ask for help because I couldnt find the part online....  first the forum wouldnt let me post a pic till I had 10 posts (whats the purpose of that????)  then it wouldnt let me post more than 5 posts (and I was being as helpful as I could) in 24 hours...  it's like they are trying to make it as hard as possible to use their forum:aargh:...  THANK YOU to quad crazy for an easy-to-use forum!!

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getting parts in- I ordered a valve compressor but it hasnt come in yet...  So I have new valves, a top end seal kit, new rings, piston, and wrist pin.  I have the honer too which I will use on the cylinder (it does have some minor scratching from the rings)

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Sounds great just don’t go crazy on the cylinder.   A few passes is all it takes.  On another note the valve springs, when you put the retainer clip in to hold the valve make sure it’s in right.   They fly off and it’s gone! 

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update:  Rebuilt the bike with:

New piston

New rings

New top end gasket kit

New valves

Honed cylinder.

Compression rose from 60psi to 120psi

Runs great and a lot stronger.  Owner pleased.  I guess this is my first successful rebuild lol- I think I was losing compression again with the last one because I didnt replace the valves or hone the cylinder.

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oh shoot.  I didnt take any because I knew what I was doing this time.  apologies to the forum!  Will take pics of the warrior as I get to it.

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It’s always good to post pics for the forum.  A picture is worth a thousand words. Plus you should be proud of your work! The next guy with the same machine with the same problem will have something to look at down the road.  

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