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Jeff Wolf

kawasaki bayou 400 piston

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Main jet was plugged..got that cleaned and other two checked....they weren't bad..

 

Reassembled...still wont fire up. Got a back fire but nothing else... scratching my head here.

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Somethings up w the carb I would assume. What did you set the air fuel screw at? Float setting good ? Main jet needle, the e clip setting ?  All put back together right ?

You could have fouled the plug also.

Lastly I would double check your timing. Im sure you put it back together the right way but it could have jumped with the backfiring.   

I would  start there.  

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Ok...we pulled the carb and cleaned the jets again...confirmed air fuel mixture was set 3 turns out...

But then we saw this orriface that was caked with dirt and totally plugged outside and on top of fuel bowl.

I'm having trouble seeing on diagram what it is...maybe just a breather and a short tube should be connected?

I tried to put an arrow to it on photo...its right beside choke connection.

20190614_174546.jpg

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It’s just a vent hose that should wrap up and around the rear of the gas tank.  3 turns out seems a little bit much.  I was thinking about 2-1/2 to 2-3/4 at most. 

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Still no go.

Check compression with starter. Get right at 50. I know this machine has the compression reduction while starting...does 50 sound about right for a cold engine just turning it over with the starter?

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After putting a little oil on top of piston compression went up to 120... is this a sign of bad rings?

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So we disassembled the head and jug and the piston. The rings were stuck...after soaking for a while we were able to get them free and cleaned them up good. Also cleaned the seats in the piston and lightly sanded with 1200grit so the rings are nice and smooth.

Oiled everything up and in the process of putting back together. Fingers crossed.

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I guess compression is a wonderful thing...cause she runs! Gotta get the valves adjusted a bit...she kinda taps right now but she purrs and not much smoke... thanks everyone for their help.

Now to change gear oil in diffs and get rear brake adjusted.

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Nice work brother. Yes compression should bout roughly about 90 to 120. So that’s weird to see. Could have just been some junk in the rings.   

Glad  to hear it’s up and running.   

Ride safe. 

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