Gearing mph calc

loudelectronics

TY 4 Stroke Guru
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Just playing with a calculator and more my 13 mtx see I input the following:
9100 rpm
18t top gear
40t bottom gear
Engine to clutch ratio of 1 since no gear reduction
Overdrive on clutch of. 9 (not sure if that is correct)
3" pitch
7 teeth for drive sprocket

Does this sound right. It shows that I should have 90 mph. However I am revving out at 65 mph. Is this just the clutching? If I put more weight in I still think I can hit 9100 rpm. This should increase track speed I would think. Currently my belt does not even get to overdrive position as it reaches only 2/3rds way up the face of the primary.

Thoughts?
 
I would say your clutching needs work for sure. I would add more weight to your primary arms so that it can fully shift which will give you a lot more track speed.
 
Loud:

It's clutched for elevation. Yami MTX from the factory have been clutched to perform at well over 6000 feet.

Since you are at relatively low elevation, it will overrev like crazy. There is a sea level kit you can get from your dealer which includes new primary spring and upper gear and a chain. I don't know the price as it was thrown into my 11 MTX purchase, but I'm thinking it was pretty steep, maybe $500?

Best option tho is to talk to Allen Ulmer. He can set you up. I am assuming that you will be running in the rocky's too, so you can proably get a setup that allows you to make a quick clutch change so the sled will operate in both worlds.

The one good thing is the yami primary can be respringed and reweighted in about 15 minutes. Its an easy job.

My 2 cents.

OTM
 
Thanks guys.

Yeah I just wanted to know if the inputs were right on the calc. I have yet to do any clutching yet. I really do not want to change gearing as you say mike cause when I go to Rockies I don't want to be pulling that apart every time. If I can clutch and get this thing to do close to 90 as the calc suggests I would be good with that. So using the calc as a stake in the ground. I just installed my hindle and as you would expect it is really over revving. Not even driveable now. Everytime you touch the gas it revs out. I just did not want to start clutching until I had installed the hindle.
 


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