Need help asap 4th thru 6th gear is like neutral

[Blaster crazy]

Hey guys just rebuilt the motor and the gears 4 - 6 are not working it's like they are neutral. But now sometimes 4th works has me completely stumped I've built many quad engines never had this problem. Was new weisco crank and piston everything torqued to oem specs

 

[Awk08]

using OEM trans drain bolt ?
had a former member report a new shiny magnetic drain plug was too long and prevented any gears above 3rd.

 

[Blaster crazy]

Nope stock and it goes into the gears I just just like neutral and revs

 

[Awk08]

Nope stock and it goes into the gears I just just like neutral and revs

1,2 and 3 will put power to the wheels ?

4,5,6 is absolutely nothing ? or just slipping bad ?

 

[Blaster crazy]

4 comes and goes but the 5th and 6th just rev as if they are in neutral

 

[Blaster crazy]

And 1 2 3 put power to wheels

 

[Awk08]

hmmmm, I'm not that up on what happens inside the trans as gears/cogs/forks do they're thing.
but I'd start with checking clutch assembly, and shift actuator fork thingy to shift star actions.
before tearing back into the cases/trans assembly.


how sure are you of your trans/gears assembly when you did the crank ?
did it shift thru all gears on the bench ?

 

[Blaster crazy]

Yea shifted through all gears took them out and inspected each one to

 

[Larry's Shee]

and shift actuator fork thingy to shift star actions.

AKA shift pawl

 

[dirtysquared]

using OEM trans drain bolt ?
had a former member report a new shiny magnetic drain plug was too long and prevented any gears above 3rd.

That happened to me last year.

 

[Blaster crazy]

Anybody else have an opinion on it and btw thanks for the help guys

 

[Blaster crazy]

Hey dirty it wouldn't u shift up into 4th or 4th would just not engage

That happened to me last year.

 

[dirtysquared]

The drain bolt was a little long, I had 1,2 and 3. Trying to go from 3 to 4_ the shifter wouldn't even budge.

I changed the drain plug back to OEM, and I got all the gears back. It was a strange experience

 

[nick20555]

We lost 6th gear once in my dad's blaster. Found out that it had shaved smooth. That would be odd for multiple gears to go at once like that but maybe a posibility if the shavings had messed up the other gears. Maybe one of the shifter forks was rattled loose or something. Have you drained the oil to see if there are shavings in it?

 

[Blaster crazy]

No have not drained the oil plus it's a fresh build and each gear was inspected before install

 

[Larry's Shee]

Is this with engine running trying to ride? Or are you trying to shift like bench test? If bench test, input or output shaft has to be spinning. If that is covered, pull clutch cover and inspect external shift mechanism. Shaft, pawl, star, and springs. If nothing found there I guess you'll have to split the cases.
Thing is, I can't see how anything inside could be assembled wrong.
Use online manual, or Clymers Repair Manual, and Ken's videos if you have to split cases.

 

[Blaster crazy]

I used cylmers manual and yes it's in quad running I can ride it

 

[Larry's Shee]

Hhmmmm. If you don't want to drain oil, turn gas off and lay it over on left side and pull clutch cover. Maybe screw that holds shift star has come loose. Plus you can inspect the rest of mechanism.
Before you pull cover check for excessive side to side play on shift shaft.

 

[Blaster crazy]

Ok thanks and I have no problem with draining the oil probaly gonna do it tonight

 

[Blaster crazy]

And by play u mean the shift lever going up and down or the actual shaft itself