Yamaha Grizzly 700 will not start

[58thecat]

Originally Posted by ram crazy

Buy a Honda and done!

yup.....sorry for the quad issue....Honda.

[Dean2]

If you put fuel directly into the spark plug holes, will it run. Can you squirt fuel directly into the intake? If it runs with either form of added fuel my bet would be fuel pump. Your backfire has to be either timing, valves or fuel. You reset the timing, reset the valve lash so fuel is the only thing left.

[kritz]

Originally Posted by 58thecat

yup.....sorry for the quad issue....Honda.

Your quad may run, but your back will give out from riding a barrel.

Stick to your Yamaha or mentioned Polaris.

The kill switch stops your machine from cranking over? I have had problems with the actual switch and also just where the wires go into it or zip ties to the bar, may break there and have. Usually the kill switch and the bar just sops ignition not the cranking? But then you would not have spark at all. and your noise you mention if it was a short would also affect spark.

Compression test will help tell a story for multiple things happening in the engine.

Sounds like electrical is good and components . need to further go down the road of mechanical.

[JohninAB]

I too am one of those former Yamaha quad owners whose quad (Big Bear) would be running fine one day and next day would not start. Put in a new plug and away it would go.

[elkhunter11]

Originally Posted by kritz

Your quad may run, but your back will give out from riding a barrel.

Stick to your Yamaha or mentioned Polaris.

The kill switch stops your machine from cranking over? I have had problems with the actual switch and also just where the wires go into it or zip ties to the bar, may break there and have. Usually the kill switch and the bar just sops ignition not the cranking? But then you would not have spark at all. and your noise you mention if it was a short would also affect spark.

Compression test will help tell a story for multiple things happening in the engine.

Sounds like electrical is good and components . need to further go down the road of mechanical.

Have you ridden a Honda with independent suspension? They ave changed a lot since the old solid rear ale machines.

[urban rednek]

That SNAP-SNAP was likely electrical, something is shorted out. Could be a bad cell in the new battery, could be worn insulation on a wire, could be inside a power relay.
Since you have already checked the ECM and the coil, try the battery next. If it isn't the battery, start metering out the wiring harnesses, focus on the main power cables.
Another thought- did you add any other accessories recently? If so, check the mounting and any strapping/lashing points for inadvertent wiring damage.

[Mb-MBR]

Originally Posted by elkhunter11

Buying a new machine usually works no matter what you buy , but long term I would rather have a Yamaha than a Polaris reliability wise.

I've always had a Polaris to uses for hunting, then went to a CanAm then went to a Yamaha (an older one, mind you) and most problems I ever had was with the Yamaha. Not saying they're crap, just my personal experience, much like yours is all positive.

But like the OP, I'm a little stubborn as well and just threw the Yammie into the corner for now and will get back at it in due time. If man built it, I'm sure its fixable...….or I'll do what I do with my putter when it acts up, stand it in the corner with a hacksaw beside it...…..LOL

[Mb-MBR]

Originally Posted by urban rednek

That SNAP-SNAP was likely electrical, something is shorted out. Could be a bad cell in the new battery, could be worn insulation on a wire, could be inside a power relay.
Since you have already checked the ECM and the coil, try the battery next. If it isn't the battery, start metering out the wiring harnesses, focus on the main power cables.
Another thought- did you add any other accessories recently? If so, check the mounting and any strapping/lashing points for inadvertent wiring damage.

I've heard my winch relay make some clicking noises in the past, when not using the winch but just starting the quad......

[58thecat]

Originally Posted by kritz

Your quad may run, but your back will give out from riding a barrel.

Stick to your Yamaha or mentioned Polaris.

The kill switch stops your machine from cranking over? I have had problems with the actual switch and also just where the wires go into it or zip ties to the bar, may break there and have. Usually the kill switch and the bar just sops ignition not the cranking? But then you would not have spark at all. and your noise you mention if it was a short would also affect spark.

Compression test will help tell a story for multiple things happening in the engine.

Sounds like electrical is good and components . need to further go down the road of mechanical.

got 15,000 km's on her....back is fine...ride almost everyday on it....no problems to date...she is a 2004...

to the OP sounds like your missing something simple? Hate those types of snags...maybe another set of eyes on her.

[Ken07AOVette]

Originally Posted by nick0danger

If it's a 2 stroke, first thing I try is new plugs!!! Fixed the reverse on a sled I bought!

Griz's are 4 stroke.

My 2002 Griz has never missed a beat.

I wouldn't take a free Polaris

[Mb-MBR]

Originally Posted by Ken07AOVette

Griz's are 4 stroke.

My 2002 Griz has never missed a beat.

I wouldn't take a free Polaris

[olsy]

I'm curious about this, any luck today?

[warriorboy10]

Originally Posted by Kurt505

Did you look into the stator? I had to replace the stator in one of my grizz 700’s.

Yup had to do the same. It’s an issue with that machine..

[Peppysan]

Originally Posted by olsy

I'm curious about this, any luck today?

No sorry, got a little side tracked as I had to go fill my cow elk tag yesterday.
So now that's she is hanging in the cooler I have a few days to maybe attack it again.

If "tullfan" is reading this, I will PM you as to your availability, at your convenience of course.

Once I get the solution I will post the results for sure.
I also have a little mod to put out there for anyone with the 2008 version of the 700. - More later.

Thanks

[Peppysan]

Well as promised I am reporting the outcome of the problem I was having with my 2008 Grizzly 700.
With some generous help from another member of this great forum, we were able to get down to the root cause of the engine that would not start. For me this one had me looking in all the wrong directions, although there "May Have Been" more than one issue present, but I will never know.
As I had mentioned, I ended up installing a new Stator and associated Crankshaft Position Sensor, this may or may not have been necessary, (as it turns out) but looking at it, it was nearly cooked anyway so future problem averted.

Now I do not understand how it happened but it appears that perhaps some carbon deposit/s came loose from around one of the intake valves, and ended up right on the seat, then when the valve tried to close it bent it enough that it would not seal. This must have happened right when I turned it off for the last time the evening before. This became immediately evident when we did a compression test and had "0" pressure - AHAH!

Got a mini-wifi camera out and managed to snake it in though the throttle body and shining a light in through the exhaust port and voila "You Can See the Light".

So we popped the head off, and a set of new valves, gaskets and a couple hours put her all back together and she started up on first crank. Hallelujah!
There you have it, didn't even have to use a paper clip or spray the switches, and it was a whole lot cheaper than a new machine, lol - Running now like a new machine.

I can't say enough good things about the assistance and knowledge brought to the situation by forum member Tullfan, much appreciated there buddy.

[Redneck 7]

Great news, glad it’s back up and running. Doesn’t sound too costly either.

[tullfan]

You’re welcome. It was a pleasure to meet you. See you again.

Tullfan.

[Peppysan]

As I mentioned earlier I did a modification to the engine to provide additional cooling to the stator, as this is a problem with the 2007 & 2008 Grizzly 700's.

I also subscribe to the "Grizzly Forum" and it is may be a better venue for this information. So I did post it there. Has lots of pictures and the procedure to do the mod if you are lucky enough to have the right case casting, (as I did). It only cost me $27 to do this for the parts.
I hope it is OK to post a link to the information, it was easier to post pictures there than here.

https://www.grizzlycentral.com/threa.../#post-1112225

[Peppysan]

Originally Posted by Redneck 7

Great news, glad it’s back up and running. Doesn’t sound too costly either.

Well including the new Stator and Crankshaft Indicator, (which I may not have required after all), and the oil line modification addition it came in at about $475. So I guess that's not too bad.
Would have been more if not for the generous help from Tullfan.

[Stinky Buffalo]

That's great to hear!

Stories like this, members helping members, make this forum awesome.