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2009 hisun 700 - no crank

Joel Goldsney

By Joel Goldsney
in Hisun UTV SxS Forum

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Joel Goldsney Apprentice

Joel Goldsney

Posted
Posted

Ok I am hoping things aren't totally pooches

Side by side stalled out on my son and wouldnt start. Seemed to have very low vacuum draw on the pump and even when primed manually it wouldn't push much gas. 

Have been wanting to check the valves any ways to see if they were off spec ( had been having issues with running rough)

I checked the valves....intake seemed a little tight and the exhaust very tight ( exhaust were brutal to get to ) 

Decided to check compression while I had the plug out....picked up a new compression tester as I couldn't find mine and was getting 0 compression.

Seemed strange so I pulled the tester out and cranked it with no plug to see if I was getting air movement.  Seemed to be pushing air out of the plug hole fine....then heard a clunk sound and now the starter won't turn it over....it trys but it's like things are jammed.

Any thoughts on how bad I have screwed up?

I didn't think anything I did should have caused any damage. 

 

 

Joel Goldsney Apprentice

Joel Goldsney

Posted
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Update......looks like I busted something.....20200725_133938.thumb.jpg.31fd03b20b63d6cb59fe8ba49e41f4f4.jpg

 

What could have caused this....

Also 20200725_134040.thumb.jpg.b53a1ae5d3e911b1a4b54b66c3ac769e.jpg20200725_133934.thumb.jpg.f0e58d926340b8e937ff625654f66722.jpg

Engine still can't crank over by hand.....It comes to a hard stop.....moves  aprox 180 deg the hits a hard something....broken valve?

Travis Grand Master

Travis

Posted
Posted

well, you'll  definitley need a new rocker arm on that right side..

Is the spark plug out when you're turning it by hand and it stops? If not, take it out and spin it by hand, if it's easier, then it could be a problem with that valve not opening causing excess compression....

if the spark plug is out, and it's still hitting... I would look for a brok valve, or valve seat popped out holding the valve down into the cylinder...

May be easier if you remove the head and inspect and look at everything.

Joel Goldsney Apprentice

Joel Goldsney

Posted
  • Author
Posted

Well I found the culprit....broken exhaust valve.

piston looks ok....appears not to have done any damage, probably because I was just cranking and not running.  

Lucky for me the previous owner had a number of spare parts and gave me the old head....going to rob the rocker arm from that.

Going to rob a valve as well....looks like it's in good condition....no putting on the seat. Going to get some lapping compound and see how it goes. 

20200726_202710.jpg

  • Like 1
Travis Grand Master

Travis

Posted
Posted

I know you will, but i can't stand not to stress it.. clean that head as though your life depended on it after lapping... That liquid sandpaper won't be good for it at 3,000 RPM...

;)  

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