Gearing, speed, and the like - Page 2 - Yamaha Raptor Forum
 

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Old 11-13-2006, 01:19 AM   #11 (permalink)
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Default Re: Gearing, speed, and the like

Well you've actually posted 2 questions but they are related.

The first on tq vs accelleration, the second has to do with bike setup. Realistically it's important to understand what your goal is. You won't necessarily be running the same gearing and tires if you're looking for fast 300' times as you would for hill climbs or for xc racing and trails.

If your goal is to get as quickly as possible to 70mph in a straight line you'll have different gearing than if your goal is to get to get from one corner to another on a flattrack or xc course. So if you're trying to go faster then increased tq combined with the appropriate widening of the gear ratios will do the trick. But if you're shooting from corner to corner you just want to get to the highest speed possible in the straightaway instead of worrying about an extra 5mph you might not have the distance to reach with your engine output.

It's a lot of trial and error for different situations. Many of the top hill climbers are running 21 or 22" paddles w/ 6-8 paddles on 12/44 or similar gearing to keep wheelspeed high up the hill. If you're running on flat dirt you're going to go with shorter tires (18-20") and taller gearing to keep traction and speed.
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Old 11-13-2006, 10:53 PM   #12 (permalink)
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Default Re: Gearing, speed, and the like

Hit the rev limiter on a stock 660?? Yeah right!!! Even with the airbox lid off and rejetted ON A DRY LAKE BED my best speed to date has been 69.4 MPH on my Trail Tech computer which is +- 1 MPH of my GPS. Someone do the math and tell us what 9000 RPM would give us in MPH on a 660 with stock rear tires. I would do it myself but I can't find a chart showing the drive ratio of 5th gear. That's not the rev limiter bud, it's water in the fuel, or a dirty air filter, or shorted wire, etc......................
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Old 02-26-2007, 07:35 PM   #13 (permalink)
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Default Re: Gearing, speed, and the like

ok ?S i ride at cinders alot theres a big hill called $100 hill that people try to make it up .... my banshee flys up it with paddle geared 14/40. but my 660 with pipe jet kit and paddle wont even get half way up ... with 13/42 gearing the raptor runs good ... i have only seen 1 660 with tons of mods get up . anywho you think i should gear down more o ya i have 20 in paddle on both bike ... first gear just runs out of power my buddys 700 goes up fine and he has 14/38 ...
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Old 02-26-2007, 09:40 PM   #14 (permalink)
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Default Re: Gearing, speed, and the like

Quote:
Originally Posted by banshee 388
ok ?S i ride at cinders alot theres a big hill called $100 hill that people try to make it up .... my banshee flys up it with paddle geared 14/40. but my 660 with pipe jet kit and paddle wont even get half way up ... with 13/42 gearing the raptor runs good ... i have only seen 1 660 with tons of mods get up . anywho you think i should gear down more o ya i have 20 in paddle on both bike ... first gear just runs out of power my buddys 700 goes up fine and he has 14/38 ...
Your buddy also has a different set of internal trans gears so you can't compare sprocket teeth just overall gear ratios.

Never been to the cinders but from what I've heard that place can be hard on paddles and the paddles hook up quite a bit. You may be exceeding the bite that your gearing/power can handle, especially up long hills. Try dropping down to a higher gear ratio and air up your tires a bit more, you should pull better up the hill and get a bit more wheelspin to keep you going.
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Old 02-26-2007, 11:17 PM   #15 (permalink)
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Default Re: Gearing, speed, and the like

so i should drop a tooth in the front or what ??
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Old 03-12-2007, 12:02 PM   #16 (permalink)
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Default Re: Gearing, speed, and the like

Quote:
Originally Posted by Teraflx
Awesome write-up Mike.
i have a 02 660 ... its piped jetted k&n i run a 12/42 and last year i dyno at 83mph and 43 hp.. this year i added a cdi box .. i hope to get up to 85 mph ..
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Old 03-12-2007, 06:08 PM   #17 (permalink)
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Default Re: Gearing, speed, and the like

Quote:
Originally Posted by 02yamrap
Quote:
Originally Posted by Teraflx
Awesome write-up Mike.
i have a 02 660 ... its piped jetted k&n i run a 12/42 and last year i dyno at 83mph and 43 hp.. this year i added a cdi box .. i hope to get up to 85 mph ..
If you're trying for top speed you've gone all the way to the other end of the gearing spectrum, you're using the wrong gears. You're also asking a lot of your bike if you've got an OEM rod in there.
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Old 03-28-2007, 11:48 PM   #18 (permalink)
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Default Re: Gearing, speed, and the like

i have an '03 raptor 660 with a big gun evo x, k&n, jets, ...minor toys, and ive been lookin at gearing up for more speed and adding a rev box for more rpm to play with and maybe even a stage 1 cam. i'm mostly stock (or so i tell whoever i race and i have been clocked at 75 with a gsxr600 going up hill, not that the hill made a difference, i was on the limiter. Neways i was curious why the last guy was told he was "asking alot of his OEM rod"? I keep my machine super tight and clean and honestly it scares me to hear that a guy with similar mods might be stressin his rod. Ive seen a number of raptors with big dollar mods on, and still running the same bottom end and it holds. Are the stock rods prone to bustage, or is it just how hard you beat your machine?
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Old 04-11-2007, 11:01 PM   #19 (permalink)
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Default Re: Gearing, speed, and the like

I'm curious as well. I've got an 04 raptor 660 with fmf q2, jets, pro flow, running 12/42 with Kenda Knarly XC Rear 22x11-9 and Kenda Klaw XC Front 23x7-10. I'm considering going down to 12/40 to stretch it out a bit but I'm not sure yet...any opinions would be helpful.
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Old 04-17-2007, 03:34 PM   #20 (permalink)
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Default Re: Gearing, speed, and the like

My 05 with stock gearing , 22 inch rears, fmf slip on was clocked at 81 by the south dakota hiway patrol.This was after a 5 mile WFO run .I have GPS'd it at 78mph. Funny thing is When it still had the stock tires on it, I gps'd it at 77 So I am guessing it is just maxed out on power with the taller tires and Im not on the limiter?
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