starts hard cold and low compression - Yamaha Grizzly ATV Forum
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post #1 of 7 Old 12-20-2011, 08:48 PM Thread Starter
 
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starts hard cold and low compression

this might be long,but please bear with me. my bike has 6000 kms,left my bike outside this weekend,tried to start it up sunday morning(temp was -3C,27F) and it started very,very hard. thought it was valves and checked them and they were good. dicided i would check my compression,the engine was cold,and got 90 PSI,put a little oil in the cylinder and got maybe 93-95 PSI. the bike has been using a little oil lately and can see blue smoke when you are really in the throttle hard. would that low of compression make it start hard? does it sound like rings?
now another question,if it needs a top-end rebuild,would you recommend a stock rebuild or go with a HC piston,cam,exhaust,filter and jet kit? do the timing chains wear on these bikes? i need this bike to be reliable and start good and run good at any temperature,even down to -20C.
looking forward to your responses, thanks

2008 grizzly 700
26" bighorn OG's on ss212 black wheels
rigid industries 10" sr series driving light
ehs big 3 with uni air filter
jbs sheave,18gram weights,purple secondary
500 rpm stall springs
perfex skid plate
heat demon heated grips and thumb
rear pass. seat
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post #2 of 7 Old 12-21-2011, 08:31 PM Thread Starter
 
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bump-nobody?

2008 grizzly 700
26" bighorn OG's on ss212 black wheels
rigid industries 10" sr series driving light
ehs big 3 with uni air filter
jbs sheave,18gram weights,purple secondary
500 rpm stall springs
perfex skid plate
heat demon heated grips and thumb
rear pass. seat
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post #3 of 7 Old 12-21-2011, 10:37 PM
 
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Stock compression is around 188 psi. You need a new top end and that is why you can barely get it to start. Once winter really kicks in for us it will not start at all.

As to the HC piston, cam hey once its open then the sky's the limit on what you want to spend.

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post #4 of 7 Old 12-21-2011, 10:55 PM
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Quote:
Originally Posted by bigredgrizzly View Post
this might be long,but please bear with me. my bike has 6000 kms,left my bike outside this weekend,tried to start it up sunday morning(temp was -3C,27F) and it started very,very hard. thought it was valves and checked them and they were good. dicided i would check my compression,the engine was cold,and got 90 PSI,put a little oil in the cylinder and got maybe 93-95 PSI. the bike has been using a little oil lately and can see blue smoke when you are really in the throttle hard. would that low of compression make it start hard? does it sound like rings?
now another question,if it needs a top-end rebuild,would you recommend a stock rebuild or go with a HC piston,cam,exhaust,filter and jet kit? do the timing chains wear on these bikes? i need this bike to be reliable and start good and run good at any temperature,even down to -20C.
looking forward to your responses, thanks
The engine has a built in compression release. You must use the proper technique to get a proper compression reading. Refer to shop manual. In those low temps you should be using a 0w-40 engine oil which will allow the engine to crank faster in cold temps.

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post #5 of 7 Old 01-01-2012, 08:35 PM Thread Starter
 
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well,i did a leak-down test and had a fair amount of air coming out the exhaust,and a little in the crankcase. took it apart tonight and found the exhaust valves are not sealing very well at all, and the cylinder has light scratches and one spot that looks and feels like a rough texture. going to take cylinder and head to machine shop tommorow and find out the damages.

2008 grizzly 700
26" bighorn OG's on ss212 black wheels
rigid industries 10" sr series driving light
ehs big 3 with uni air filter
jbs sheave,18gram weights,purple secondary
500 rpm stall springs
perfex skid plate
heat demon heated grips and thumb
rear pass. seat
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post #6 of 7 Old 01-01-2012, 08:35 PM Thread Starter
 
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well,have to bore out .5mm and the shop said he could grind the valves and the valve seats. i was thinking about changing the timing chain,the guides have no wear and looks like the tensioner could still come out another half inch. would the chain be stretched with 6000 kms?

2008 grizzly 700
26" bighorn OG's on ss212 black wheels
rigid industries 10" sr series driving light
ehs big 3 with uni air filter
jbs sheave,18gram weights,purple secondary
500 rpm stall springs
perfex skid plate
heat demon heated grips and thumb
rear pass. seat
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post #7 of 7 Old 01-06-2012, 08:37 PM Thread Starter
 
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well, its all back together. where i bought the piston they sent me a hc piston by accident so that is what i put. started it up last night and it started on the first crank,idled nice. tommorow is the big day ! have to break it in on a good ride. cant wait to see if that hc piston makes any difference!

2008 grizzly 700
26" bighorn OG's on ss212 black wheels
rigid industries 10" sr series driving light
ehs big 3 with uni air filter
jbs sheave,18gram weights,purple secondary
500 rpm stall springs
perfex skid plate
heat demon heated grips and thumb
rear pass. seat
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