Help! with the gears

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k.jensen

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Hey all, My XB came stock with metal gears, but what is the std gearing then??


also my problem is mostly this:


I installed my new jetpro and wt-990 carb, adjustet the carb as perfect as possible, BUT


I can hear the power in the engine, yet nothing comes out of it, theres no difference from half to full throttle, and yes the throttlepin goes all the way down.


witch gearing would be best:confused:


31Tx1 - 25Tx2 - 29Tx1


or


35Tx1 - 25Tx3


thanks in advance!
 
k.jensen said:
Hey all, My XB came stock with metal gears, but what is the std gearing then??
also my problem is mostly this:


I installed my new jetpro and wt-990 carb, adjustet the carb as perfect as possible, BUT


I can hear the power in the engine, yet nothing comes out of it, theres no difference from half to full throttle, and yes the throttlepin goes all the way down.


witch gearing would be best:confused:


31Tx1 - 25Tx2 - 29Tx1


or


35Tx1 - 25Tx3


thanks in advance!
Click to expand...
I'm getting the same as you bud. I switched my gears around (31-29-25-25) and the top speed sucks. I'm disappointed because my hog of an MT with the DDM pipe and a 28.5 will mop the floor with the XB. I have mine tuned perfect and it just doesn't have the top speed that I expect. I guess the next step for me is a headkit.


Here's a gear ratio chart:


gearchartrampage.webp
 
Last edited by a moderator:
I run the equivilent of a 35/25/25/25 gearset on my belt drive and I'm not even close to bogging. It's a good balance of top speed and torque if you have a big engine.


If you running the stock engine w/ a pipe or a 26cc a 33/27/25/25 would be a good start. 31/29/25/25 is just too slow on the XB.
 
well I'm going for a good mix of top and buttom, my bottom (torque) is great,


it reaches the top speed in no time.


I run the stock 30cc engine with the jetpro sidemountet pipe.


guess I'll try the


35Tx1 - 25Tx3


just to see how it runs with that.


thanks for your input guys :)
 
racetruck said:
sounds like you have a bad carb try and richen the high end needle and see if it gets better or not
Click to expand...
tryed that, no change, u can hear that the engine takes alot of rpms but the gears cant keep up
 
go to A-31 and B-29 if from half throttle to full it should make a change with any gears check and see if the baffle moves all the way you said you just put on the 990 put the old carb back on and run it to see if it makes a diff.
 
I've got the same set up he has, except mine has the stock carb, I still have lots of low end after switching the gears around and it made a hair difference. My carb is tuned perfect, spark plug is a nice brown. The top end is just disappointing. Mine revs high as hell but it just doesn't have any speed at all.
 
my redcat dealer just informed me that those gearratios are the old ones and he would like me to try out the 29x31x24x26 that's whats hes running
 
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