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Lt80 Hard To Start

  #51  
Old 02-03-2019, 02:09 PM
Trailblazer
Join Date: Jun 2012
Location: Colorado
Posts: 30
Default

Hey LT80,
I bought the cylinder set from you so I don't know if port work was done. No sweat on the bearing, we're square. I'm happy to get your help and parts. I'll try lowering the needle one notch. What does that do? Tractor Suppy suppose to have #40 and If I can find a 14 tooth I'll try it. Thanks
 
  #52  
Old 02-03-2019, 04:40 PM
Extreme Pro Rider
LT80 Expert
Join Date: Mar 2001
Posts: 7,846
Default

Ok, Thanks.
Yep, wish I would have done some port work.
I do know the head is shaved.
AS far as the bog, Still running all 6 rollers?
 
  #53  
Old 02-03-2019, 07:57 PM
Trailblazer
Join Date: Jun 2012
Location: Colorado
Posts: 30
Default

Hmmm, "Bog" "rollers" you'll need to educate me please.
Didn't know head was shaved. That'll add compression right? A good thing.
 
  #54  
Old 02-07-2019, 03:19 PM
Trailblazer
Join Date: Jun 2012
Location: Colorado
Posts: 30
Default

LT80 , I'll send you a PM.
 
  #55  
Old 02-10-2019, 12:16 AM
Trailblazer
Join Date: Jun 2012
Location: Colorado
Posts: 30
Default

After doing some poking around, "rollers" it seems refers to the clutch rollers? I don't know if there are 6 or less.
When I tear it down, should I use less then 6 rollers????? what would be gained or lost? I'll search for more info
and try figure it out. Perhaps I can find a diagram. Thanks all.
 
  #56  
Old 02-11-2019, 12:47 PM
DirtDevil101's Avatar
Pro Rider
Join Date: Oct 2015
Posts: 1,092
Default

The "rollers" on a centrifugal clutch determine at what RPM the movable sheaves engage the belt pushing you forward. The "stock" set-up has 6 rollers and engages pretty quickly...but that's aligned pretty well with the stock motor making it feel torquey down low with a decent top end.

If you modify the motor (porting/stroking/other) then the power & RPM ranges where you make the most power also change...thus requiring a change to the weights (rollers) in the primary & secondary. Removing weight means you need to spin the clutch faster (more RPM) to engage with the same belt force as if there was more weight...modified motors will spin higher in the RPM range so the stock clutching will need to be changed...

In a stock motor removing rollers will just increase the RPM at which the clutch engages...good for the hole-shot, but because you have the same overall RPM to work with you will suffer some in top speed...
 
  #57  
Old 02-11-2019, 04:40 PM
Trailblazer
Join Date: Jun 2012
Location: Colorado
Posts: 30
Default

Excellent Jack. Thanks for taking the time to explain all that science to this rookie. Greatly appreciated. Only motor mods is the top end I bought from you and That was a bored cylinder, possibly shaved. Then I added new gearing and chain.
Now that I understand a bit, I'll play with rollers see what we get.
 
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