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What tranny to use?


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I guess I'll chime in too, I'm rebuilding my entire motor and had a 2-5 override out of another shee that I parted out. I'm running stock drag ported cylinders by fast and a stock stroke long rod, v4 reeds, shearer small bore, 34mm pj carbs pump gas. would it be a bad idea to run an override, I don't trail ride it much just ride the shore line and drag race and go to little Sahara ok a few times a year?

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okay guys....here ill break it down.

 

An override is a drag style transmission.  It allows the rider to pull up to the line and launch just like a regular trans/clutch setup.  What it does then is allows you to shift into the remaining gears while on the throttle without backing out of the throttle or pulling the clutch in.  You just jam the next gear and it shifts.  A dunable is just a slightly different way the trans is worked over to SLIGHTLY be more forgiving.

 

What CANNOT be done with an override (dunable or not) is slowing down by using the engine to help.  So basically when you want to slow down you HAVE to pull the clutch in and coast to a stop.  This is why it is meant for drag racing applications.....as your either on the throttle 100% or your completely off the throttle and using the brakes to stop.  You CAN downshift to get more power out of a lower gear (say if you coasted and want to accelerate again) however to minimize damage you have to hold the clutch in and drop down the gear and THEN you have to match the rpm and speed to ensure no damage to the override.  If you have it setup wrong, or ride it wrong, you are either going to do damage to the trans first or you are going to burn up the shift forks in a hurry.  There have been a few guys who, even though they ride em right and treat em right, require shift fork replacements after about 2 days of riding.  So a lower end R&R job is common.

 

This is why you are hearing people say that unless your going to be drag racing, it is not worth it.  Camatv on here has modified hundreds of transmissions and done some quality R&D on his own time to make the best running modified stock trans that you can absolutely beat the snot out of and still have function perfectly fine. 

 

the 2-5 Neutral down overrides means that N is all the way down with only 2-5 gears available so N-2-3-4-5 and a 1-5 Neutral down is basically the same just N-1-2-3-4-5.  There are seldom N down Trans's that have 6th only because most drag races are not long enough to actually be able to pull 6th far enough to make good power/speed.

 

I hope this has cleared stuff up for you guys. 

 

Personally I would NEVER run an override on anything except a dedicated drag bike......even a strictly duner I would only get a modified trans for it.  Not an override. 

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