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Hey all, I've been around many other forums but decided to join up on this one for some insight!

Anyway....we have a yamaha grizzly 350 we got back in 2011 that has a habit of killing starter brushes...we pull started it from about 2012 onwards when the starter went and never thought nothing of it. We replaced the starter with an after market one from yamaha last year in October and it lasted only 3 months...we managed to get that under warranty. But when it happened again a few months after that they refused to do it under warranty because they thought there was something wrong with the bike to be killing starters like that. I've heard that after markets don't work properly because they dont fit right? Others have also said that a gear may be jammed or something? Anyway they wanted to see the bike and god knows how much that would cost. Everyone knows how fun it is to try and pull start these beast...let alone using it as the only source for starting...

So what could possibly be the problem? And the remedy?

Appreciate all the help.
 

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It's quite possible it's something else, but I wouldn't rule out the starter completely. A few years ago I went through three different starters in the same truck in a month. I won't say it sucked, but I now know how to do that starter blindfolded!!;) How long are you cranking on it when trying to start it? If it's for a long period of time, it could be over heating causing premature failure.
 

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Make sure your automatic decompression is working. If it's not, you'll burn up starter motors.
 

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Hey all, I've been around many other forums but decided to join up on this one for some insight!

Anyway....we have a yamaha grizzly 350 we got back in 2011 that has a habit of killing starter brushes...we pull started it from about 2012 onwards when the starter went and never thought nothing of it. We replaced the starter with an after market one from yamaha last year in October and it lasted only 3 months...we managed to get that under warranty. But when it happened again a few months after that they refused to do it under warranty because they thought there was something wrong with the bike to be killing starters like that. I've heard that after markets don't work properly because they dont fit right? Others have also said that a gear may be jammed or something? Anyway they wanted to see the bike and god knows how much that would cost. Everyone knows how fun it is to try and pull start these beast...let alone using it as the only source for starting...

So what could possibly be the problem? And the remedy?

Appreciate all the help.
You don't list the exact model/year for your bike but it may be possible you have a bad starter clutch. If it doesn't disengage then your starter motor will turn all the time- and that's how the brushes are being eaten up fast.
 

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Discussion Starter #5
Thanks guys for the responses.

I know for a fact that we never had the starter motor spinning more than a second or two to start the bike...so that shouldn't be the problem...

Now that automatic decompression sounds pretty interesting...because we all know how well it works for the pull start haha...especially when its the only way to start it...Is there a way to test to see if it is working?

Now this is an interesting point...how would we test the starter clutch?

And to clarify its a 2011 Yamaha Grizzly 350. If you need more details, than ill find the vin number this arvo for it.

Thanks for the help so far!
 

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This could also be a relay problem.
To test try removing the spark plug then hit the starter. Does it keep turning over when you release the start button?
 

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Next, At the relay disconnect the positive cable going to the starter. Connect a volt meter to the starter cable and to the frame. Pull start the engine. Got voltage? If so it is possible that the OW is turning the starter motor.
 
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