Fast Jimmie
Newbie
I'm talking about top speed here.
My dad and I are having this debate yesterday and we didn't get anyware. He says if both sleds spin at 10,400 rpm's and clutches are both engaged fully for top speed (as in a top speed run), the drive ratio (from the engine to the track) would be no different for either and a Turbo cannot go any faster than a stock sled.
He says the only way to go faster is by further changing gearing or running higher rpm's.
Does every turbo guy change his gearing right away?
Waiting for the day I can afford a turbo.
My dad and I are having this debate yesterday and we didn't get anyware. He says if both sleds spin at 10,400 rpm's and clutches are both engaged fully for top speed (as in a top speed run), the drive ratio (from the engine to the track) would be no different for either and a Turbo cannot go any faster than a stock sled.
He says the only way to go faster is by further changing gearing or running higher rpm's.
Does every turbo guy change his gearing right away?
Waiting for the day I can afford a turbo.
Turbo Tim
TY 4 Stroke Master
UHHH..........I'm gonna go with yes.
Turk
Tech Advisor
Lets see....my particular rX-1 was turning 10,200 rpm & running about 115ish on GPS..perfect conditions. My Turbo RX turning 10,200 rpm now does 126 on GPS in about 1200' & still climbing. So...the correct answer is ??????
Otis RX
Expert
TURK........
What gearing combination are you running?
I can't recall if you're on a mountain sled or not.
Here's a what if........ say I go TURBO on a 121 w/reverse. I hear you can only change the top gear to one size up 25/38 vs stock 24/38. Can the stock chain be used?? Bottom gears can't be changed unless you get a new chain case cover and dump the reverse. Is that correct?
Thanks for the input.
OTIS
What gearing combination are you running?
I can't recall if you're on a mountain sled or not.
Here's a what if........ say I go TURBO on a 121 w/reverse. I hear you can only change the top gear to one size up 25/38 vs stock 24/38. Can the stock chain be used?? Bottom gears can't be changed unless you get a new chain case cover and dump the reverse. Is that correct?
Thanks for the input.
OTIS
Sled Dog
Lifetime Member
Not that much of a change in top end speed but huge diff in how long it takes to get there.
Simons CPR
TY Advertiser
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stock sleds don't have the power to fully close the sheaves to get all the overdrive out of them with stock gears, add more hp, and more weight in the clutch, now you can pull full overdrive and run more mph, stock gears on most stock rx-1s top out at 114mph, on our turbo stock gear tops out at 138mph, bouncing of the rev limiter, anotherwards it begging for more gear. jeff
Turk
Tech Advisor
I just changed my gearing this week from 24/38 to 25/38 & the 70 link chain still works. 24/38 is not enuff gear for the turbo. I am running a shortie with an x-pert X skid running a 9818 1.25" track.
Fast Jimmie
Newbie
SIMONS CPR said:stock sleds don't have the power to fully close the sheaves to get all the overdrive out of them with stock gears, add more hp, and more weight in the clutch, now you can pull full overdrive and run more mph, stock gears on most stock rx-1s top out at 114mph, on our turbo stock gear tops out at 138mph, bouncing of the rev limiter, anotherwards it begging for more gear. jeff
Thanks for the first logical answer, but why wouldn't Yamaha have designed the clutch to work to its full potential from the get-go. Or is it errelevant(sp?) how far the clutches actually engage?
Otis RX
Expert
TURK..... Thanks for sharing the gearing info.
Jeff ..... Thanks for the great answer to Jimmie's question. I had a feeling there was more to it.
OTIS
Jeff ..... Thanks for the great answer to Jimmie's question. I had a feeling there was more to it.
OTIS
Buckeye
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Otis RX said:TURK........
What gearing combination are you running?
I can't recall if you're on a mountain sled or not.
Here's a what if........ say I go TURBO on a 121 w/reverse. I hear you can only change the top gear to one size up 25/38 vs stock 24/38. Can the stock chain be used?? Bottom gears can't be changed unless you get a new chain case cover and dump the reverse. Is that correct?
Thanks for the input.
OTIS
Yes you can't change the bottom gear and keep reverse. You might be able to change the bottom gear and not change the cover. I will have to look into that. I am not sure that the 25 top gear is enough. I am told that Micro belmont, now has a 26 and it works with the 7o link chain. I know my et in the qtr improved with the 25 vs. the 24. I also picked up mph. Haven't tried the 26 yet. I guess the amount of boost you run is also a factor. My results are with 12 lbs.
Turbo Tim
TY 4 Stroke Master
Yeah what Jeff said ............I was just getting around to saying that ..
Now these are good answers guys, keep it up.....
black john
TY 4 Stroke Guru
gearing
micro belmont has top gears up to 27 tooth and there is a bottem 37 for the rev models avlable from yamaha
micro belmont has top gears up to 27 tooth and there is a bottem 37 for the rev models avlable from yamaha
Buckeye
Lifetime Member
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Re: gearing
Are you sure about the 37? Do you have a part number?
black john said:micro belmont has top gears up to 27 tooth and there is a bottem 37 for the rev models avlable from yamaha
Are you sure about the 37? Do you have a part number?
POWERHAULIC
VIP Member
Micro-Belmont only has up to 25T. for RX.
I also would like to know the part# for the reverse 37T. sprocket
I also would like to know the part# for the reverse 37T. sprocket
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