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decompression issue

This is a discussion on decompression issue within the Grizzly Engine & Transmission forums, part of the Grizzly Forums category; Has anyone had a decompression switch problem on any Grizzly's. Bike acts like it is hydro locked and burns out selenoids!!...


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#1
06-07-2009, 03:22 PM
decompression issue

Has anyone had a decompression switch problem on any Grizzly's. Bike acts like it is hydro locked and burns out selenoids!!
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#2
06-07-2009, 04:19 PM
WHAT?
please explain in more detail......Year, model , ect.
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#3
06-07-2009, 04:34 PM
04 grizz At first you would push the start button and it sometimes was like it is jammed. then if you just tap the start button it would turn over.Used it this way but it took out to starter relays. you can jump the relay but it sometimes does the same lock-up. When it is locked you can't pull start it either, and yes i can always pull start all my grizzly's(4)This is a high mileage quad 4500km's a spring,22000km's in all on this one
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#4
06-07-2009, 04:43 PM
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Originally Posted by neech68 View Post
22000km's in all on this one


Holy crap!




You able to get any pics of it? I wanna be able to prove to the popo friends that Yamaha lasts forever!
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#5
06-07-2009, 04:54 PM
HaHa.I am an outfitter in saskatchewan and we only use Yamahas because of durability but this problem is something new. Had a 600 with 24000km's.Bear hunt/quad riding combo could be possible.I ride 60 to 120 miles daily,mostly in the muck
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#6
06-07-2009, 09:02 PM
O.K. - Now were getting somewhere!
When you said "Decompression" - I thought you took you Grizz scuba diving.

It sounds like the starter is jamming up. Possible due to faulity relay, or just the starter has run it cource and needs to be replaced.
The reason you can't pull start it when it locks up is the starter bendix is most likely jammed into the flywheel and it's stuck.
When this happens, can you try to push the old girl foward & back while in gear, with the key on. Possibly you may get lucky and unstick the starter - but still, it's going to need to be replaced......

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#7
06-07-2009, 10:28 PM
nope,tried a different starter,same results.It is not always jammed. I looked on parts nation and see that there is an auto decompression cam,might just beworn or the springs are worn on the cam.Yamaha parts nation is a good sight with online parts finder,shows everything you need .Thanks for the help
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#8
06-08-2009, 06:47 AM
on the 700 it`s a very simple system I don`t think it could jam up and stop the motor from turning over.
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#9
01-14-2010, 07:22 PM
I know one can rip their shoulder out trying to pull start one but that is how i got mine to start when this happened to me
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#10
09-23-2010, 11:39 AM
Was this figured out?

My Grizzly is doing the same thing, starter seems likes it doesn't have enough power, basically impossible to pull start. Battery is holding a charge fine solenoid has been replaced and there is a new starter on the bench.

Also, lots of times it cranks for a long time (2-3 ten second intervals) before starting. After that it starts right up.

Are these issues related to the compression release system?

Any thoughts?
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#11
09-23-2010, 02:34 PM
Have you checked your valves to see if they are in spec?
The 660 Grizz is notorius for valves that tighten up around every 800-1000 miles.
Cranking a long time to start=tight valves
Piston catches at TDC and gives symptoms that something is wrong with selonoid or starter= tight valves
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#12
09-23-2010, 05:17 PM
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The reason you can't pull start it when it locks up is the starter bendix is most likely jammed into the flywheel and it's stuck.
The 660 doesn't use a bendix on the starter, it uses a one-way bearing. The 600 used a bendix, but not the 660.

I don't know if this is your problem or not, but I had a 660 Raptor that did the same thing and it was the pin in the cam that the decompressor system lifts to hold the valve open when starting. The top of the pin was worn and it wasn't opening the valve. The 660 Raptor uses the same decompressor system as the 660 Grizzly, same exact setup. A brand new, fully charged battery wouldn't turn the engine over, but occasionally you could bump the starter and it would start. Even jump starting it from an automobile was very hard, sometimes it would start and sometimes it wouldn't. I put a new pin in the cam and it started every time.

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#13
09-23-2010, 08:42 PM
my 660 did the same thing battery was bad, held charge but using a volt meter showed 12.2 v then tryed to start it and it would go down below 9 volts some times go to 6 v. put new battery in and it worked fine. i thought a bad starter or solonid. or might be the high comp piston but it was just a battery.

before i put a new battery when it would turn over it would do it just like a good battery but would not get started, i can not use the pull rope, high comp piston, mud buster can [done before i got it] so when it would not start i would pull on the rope and hit the starter and it would turn over fine and start.

check battey volt while cranking, [u want the reading when u first start to try], sounds like a bad battery
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#14
09-24-2010, 02:36 AM
digging 1 up from the archives. could also be fuel draining down in to the cylinder causing hydro-lock.
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#15
09-24-2010, 08:58 AM
Thanks for the insight

I checked the intake valves last night, they were out of spec - too loose. Somewhere around .007" instead of .002-.004 (I may have the numbers wrong, this is from memory). Will loose valves have similar symptoms as tight valves?

I'll check the cranking voltage on the battery or slap a jump box on it and see if there's a difference. Generally, once the engine starts cranking it goes fine, it just that sometimes it seems like there's a flat spot and it wont start cranking. It started doing all this within the last month or so.

I'm going to throw in the new starter while everything is off. I figure it's better to have a new one on the machine and 11 year old on on the bench rather than the other way around.
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