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Big Block Talk! Everything about swapping a big block engine into your cart! |
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07-24-2017, 01:32 PM | #1 |
Gone Wild
Join Date: May 2017
Posts: 200
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Belt slack for key on idle
I got my 18amp 420 mounted in my 1989 marathon. It's going to be key on start, so I will be idling. I measure for a belt and came out to 38". I think I remember 2" is the right slack for an idle set up. Found a 40.3" belt cheap, is it the right one? Thanks
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07-25-2017, 11:33 AM | #2 |
Gone Wild
Join Date: May 2017
Posts: 200
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Re: Belt slack for key on idle
Bump for thoughts
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07-25-2017, 12:34 PM | #3 |
Crazy Ole Man
Join Date: Jan 2016
Location: Owego NY
Posts: 2,758
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Re: Belt slack for key on idle
I run mine at about 1.25-1.5" of play.
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07-25-2017, 12:39 PM | #4 |
Gone Wild
Join Date: May 2017
Posts: 200
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Re: Belt slack for key on idle
Do you have a pedal start or do you key start and let it idle?
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07-25-2017, 12:53 PM | #5 |
Crazy Ole Man
Join Date: Jan 2016
Location: Owego NY
Posts: 2,758
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Re: Belt slack for key on idle
Key start - idles 1250 rpm
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07-26-2017, 12:24 AM | #6 |
Gone Wild
Join Date: May 2017
Posts: 200
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Re: Belt slack for key on idle
Ok. Thanks
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07-27-2017, 08:36 PM | #7 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,445
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Re: Belt slack for key on idle
Sometimes it has to do with the primary clutch you have, stock yamaha for example have no spring and unless you idle really slow they will engage even with a loose belt. Too large a belt will hurt performance. 780 seem to idle fine. Also note a new belt is usually sticky and will drag until it gets some dust and miles on it.
You can also idle them slower, but you may have to drill the idle mix plug out and get at the screw, or buy a VC carb with one. You usually have to adjust the mixture to get a slow idle. My clone idles at 800 or something it will idle down until the comp release comes on. Not sure how it will idle with the new VC cam however, we will see. But I only idle it with the pedal anyway I still have stock gen starter on it and it quits if I let off. |
07-29-2017, 09:31 AM | #8 |
Gone Wild
Join Date: May 2017
Posts: 200
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Re: Belt slack for key on idle
I'll be running a comet 780. The one I have is junk but lets me mock it up. I had a belt come today in the mail and it fits great. As far as bc I wrote them off, I'll buy anywhere else tho. Thanks for the input sho305, keep us updated with your project!
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07-29-2017, 02:18 PM | #9 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,445
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Re: Belt slack for key on idle
780 should work great! Working on the motor today actually, about time.
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