Began to post recently and was directed here, my original may not have made the grade.
Anyhow, I have just acquired a 93' trx300fw in pretty great cosmetic condition. Oils looked clean without burn signs or smells.
Turned the key on and no dash lights so I figured the battery dead, .01 VDC, it's toast.
Flipped the compression release lever (csl) for kick starting and the kick lever went down effortlessly. Noted the csl did not return to the down position so I flipped it down and again the kick start lever went down effortlessly.
I put the transmission in gear and the machine jumped forward with some kick start lever resistance.
My brother in law took it on trade and basically gave me the machine so I figure it's worth fooling with, I need 2 quads for work anyhow.
Here's what I've done and observed so far.
1) I removed the valve covers and checked both the operation of the compression release lever (works properly, opens exhaust valve) and timing chain movement. The timing chain moved when I turned the reduction wheel counter clockwise but not when I kicked it.
2) I removed the head cover and inspected the valves for any issues with springs or apparent broken/missing parts. Visually looks good.
3) Next I loosened the tensioner bolts without retracting the tensioner mechanism. Reason was I wanted to see if there was much pressure on the timing chain as there was a wee bit of slack but not much when I inspected the chain. A new chain may or may not be warranted but contingent on what's next.
4) Next step was removing the sprocket, the cam and suspending the chain from wire.
5) I then removed the head and inspected the valves visually. No burned seats, bends, there's some carbon build up but nothing excessive.
6) If I place tension on the timing chain the piston works normally.
My next step is cleaning all of the parts and measuring the barrel, piston, cam, valves etc.
I guess my question is, if everything measures out good, what's your opine on the low compression issue?
I may decide to put in new gaskets and reassemble the engine. (That's contingent on the measurements.) Buy a new battery and do a compression test, see if it starts and call it good for a bit.
Or
I may decide to do a real rebuild now rather than later.
Thanks
Anyhow, I have just acquired a 93' trx300fw in pretty great cosmetic condition. Oils looked clean without burn signs or smells.
Turned the key on and no dash lights so I figured the battery dead, .01 VDC, it's toast.
Flipped the compression release lever (csl) for kick starting and the kick lever went down effortlessly. Noted the csl did not return to the down position so I flipped it down and again the kick start lever went down effortlessly.
I put the transmission in gear and the machine jumped forward with some kick start lever resistance.
My brother in law took it on trade and basically gave me the machine so I figure it's worth fooling with, I need 2 quads for work anyhow.
Here's what I've done and observed so far.
1) I removed the valve covers and checked both the operation of the compression release lever (works properly, opens exhaust valve) and timing chain movement. The timing chain moved when I turned the reduction wheel counter clockwise but not when I kicked it.
2) I removed the head cover and inspected the valves for any issues with springs or apparent broken/missing parts. Visually looks good.
3) Next I loosened the tensioner bolts without retracting the tensioner mechanism. Reason was I wanted to see if there was much pressure on the timing chain as there was a wee bit of slack but not much when I inspected the chain. A new chain may or may not be warranted but contingent on what's next.
4) Next step was removing the sprocket, the cam and suspending the chain from wire.
5) I then removed the head and inspected the valves visually. No burned seats, bends, there's some carbon build up but nothing excessive.
6) If I place tension on the timing chain the piston works normally.
My next step is cleaning all of the parts and measuring the barrel, piston, cam, valves etc.
I guess my question is, if everything measures out good, what's your opine on the low compression issue?
I may decide to put in new gaskets and reassemble the engine. (That's contingent on the measurements.) Buy a new battery and do a compression test, see if it starts and call it good for a bit.
Or
I may decide to do a real rebuild now rather than later.
Thanks