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Discussion Starter · #1 ·
Just got back from Sand Mtn. Great time as usual.
My 2004 660 with port/polish, cam, Airbox, Yoshi with 22" Skat-tracs ran great.
Ran pretty close with some slightly mod'd 700s, real close. In fact, I was pulling on them late up the hill.

what can i do next without doing something over?
carb? I don't think the front sprocket was changed before I bought it?
I just want to get the 700s!

thanks in advance!
 

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new piston and a big bore kit and LTE duals
 

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boostman said:
sorry....686 kit installed too!

My 686 runs even the nicest 3 mod 700's into the ground. You shouldnt be having problems? I'd up it to a bigger bore/stroke and get a set of fcr 39mm's.
 

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Gearing will make a HUGE difference in how fast you go up that hill or acrossed that sand, that'd be the first thing I mess with. If you're still using a stock length swingarm you're losing a couple lengths as well.
 

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Discussion Starter · #6 ·
so down a tooth in the front? is that then a 15 tooth? is 16 stock?

longer swing arm? why
what length would I go to over stock?

thanks
 

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boostman said:
so down a tooth in the front? is that then a 15 tooth? is 16 stock?

longer swing arm? why
what length would I go to over stock?

thanks

13 is the stock front. A 12 makes a big difference and with your mod's shoudlnt bother your top end. I've ended up staying with the 14 even in the trails just suits my riding style better.
 

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Discussion Starter · #8 ·
I have to drop to second pretty early on some of the hills.
I am 6'4" 240lbs so I am sure that makes a difference.
A buddy of mine, about 5'10" and 160lbs while riding my bike makes it up the hills in 3rd and 4th.

I have heard that every 10lbs of rider weight is equivelent to a hp.
so a 160lb rider on the same bike as a 240lb rider has 8 more hp.

So a 12 tooth should help me since most of my riding is on the dunes?
 

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boostman said:
why does a longer swing arm help speed?
Keeps the front end on the dirt?

thanks
Essentially yes, you can launch harder and keep the front end down.
 

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were you at sand mountasin nevada?
 
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