exploding primary clutch

slonomo · 02-15-2016, 11:07 AM

I was also going to say that the clutch was probably beyond worn out. It probably had some drive-ability problems the last time it was driven. Ask the owner if it had problems getting going, like any "jerky" starts. Also look at the sheave faces and see if there is a groove or dish to the surface. Look at the pins (or what's left of them) on the weights for oblong or out of round shape. Look at all the moving parts for uneven wear. I'm betting you'll find it.

It's also possible that if the owner or previous owner ever had the clutch out that they may have dropped it. This can cause a crack that you can't see or even tell it's there....the BOOM. As you see it exploded.

If it is a replacement clutch (not original Yamaha) it could be inferior casting and assembly, etc.

Definitely NOT common. But I have heard of them exploding. So I voted yes on the poll.

Carl752 · 02-15-2016, 01:46 PM

that's what is odd to me, the pieces I have left don't look worn badly, the rollers and weights look ok pins seem tight, I don't know seems to b a fluck thing but it sure scares the livin crap out of a person!!!!!!!!!!!

raceinsnow · 02-15-2016, 01:54 PM

Was the belt on it when this happened. No belt on and then the clutch slammed close at a high rpm?

TheNewGuy · 02-15-2016, 02:33 PM

Quote:

Originally Posted by raceinsnow

Was the belt on it when this happened. No belt on and then the clutch slammed close at a high rpm?

Good point.

slonomo · 02-15-2016, 03:19 PM

Quote:

Originally Posted by raceinsnow

Was the belt on it when this happened. No belt on and then the clutch slammed close at a high rpm?

Hmmmm

Carl752 · 02-15-2016, 03:51 PM

no belt on, don't think it was reved up that high, but that was my first thought, however another close friend has worked on these Yamaha's for years and said he had run them a million times with out the belt! mayb he got lucky a million times!

smallblock450sl · 02-15-2016, 07:49 PM

In thirty plus years, I've never seen one explode like that! My guess, someone before you, tried to remove it with the wrong puller. Glad no one was seriously maimed from the shrapnel.

slonomo · 02-16-2016, 01:48 AM

Quote:

Originally Posted by smallblock450sl

In thirty plus years, I've never seen one explode like that! My guess, someone before you, tried to remove it with the wrong puller. Glad no one was seriously maimed from the shrapnel.

This is what I was thinking. Maybe someone dropped it, but the puller thing sounds logical. Tiny little cracks is what i was thinking.

Carl752 · 02-16-2016, 03:28 PM

have you ever run them with out the belt?

smallblock450sl · 02-16-2016, 04:03 PM

Yes, but never at wide open throttle. Useually to isolate noise from tansaxle or engine.

View Poll Results: have you seen or heard of these colf cart clutches exploding?
yes	1	20.00%
no	3	60.00%
other	1	20.00%
Multiple Choice Poll. Voters: 5. You may not vote on this poll

02-15-2016, 11:07 AM	#11
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,436	Re: exploding primary clutch I was also going to say that the clutch was probably beyond worn out. It probably had some drive-ability problems the last time it was driven. Ask the owner if it had problems getting going, like any "jerky" starts. Also look at the sheave faces and see if there is a groove or dish to the surface. Look at the pins (or what's left of them) on the weights for oblong or out of round shape. Look at all the moving parts for uneven wear. I'm betting you'll find it. It's also possible that if the owner or previous owner ever had the clutch out that they may have dropped it. This can cause a crack that you can't see or even tell it's there....the BOOM. As you see it exploded. If it is a replacement clutch (not original Yamaha) it could be inferior casting and assembly, etc. Definitely NOT common. But I have heard of them exploding. So I voted yes on the poll.

02-15-2016, 01:46 PM	#12
Carl752 Not Yet Wild Join Date: Feb 2016 Posts: 10	Re: exploding primary clutch that's what is odd to me, the pieces I have left don't look worn badly, the rollers and weights look ok pins seem tight, I don't know seems to b a fluck thing but it sure scares the livin crap out of a person!!!!!!!!!!!
Carl752 Not Yet Wild Join Date: Feb 2016 Posts: 10

02-15-2016, 01:54 PM	#13
raceinsnow Not Yet Wild Join Date: Apr 2009 Posts: 15	Re: exploding primary clutch Was the belt on it when this happened. No belt on and then the clutch slammed close at a high rpm?
raceinsnow Not Yet Wild Join Date: Apr 2009 Posts: 15

02-15-2016, 03:51 PM	#16
Carl752 Not Yet Wild Join Date: Feb 2016 Posts: 10	Re: exploding primary clutch no belt on, don't think it was reved up that high, but that was my first thought, however another close friend has worked on these Yamaha's for years and said he had run them a million times with out the belt! mayb he got lucky a million times!
Carl752 Not Yet Wild Join Date: Feb 2016 Posts: 10

Today
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02-15-2016, 07:49 PM	#17
smallblock450sl Sometime's............ Join Date: Oct 2007 Location: Tacoma Washington Posts: 11,874	Re: exploding primary clutch In thirty plus years, I've never seen one explode like that! My guess, someone before you, tried to remove it with the wrong puller. Glad no one was seriously maimed from the shrapnel.

02-16-2016, 03:28 PM	#19
Carl752 Not Yet Wild Join Date: Feb 2016 Posts: 10	Re: exploding primary clutch have you ever run them with out the belt?
Carl752 Not Yet Wild Join Date: Feb 2016 Posts: 10

02-16-2016, 04:03 PM	#20
smallblock450sl Sometime's............ Join Date: Oct 2007 Location: Tacoma Washington Posts: 11,874	Re: exploding primary clutch Yes, but never at wide open throttle. Useually to isolate noise from tansaxle or engine.

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