Savvy owners please lend a hand....

[kawasakirider]

Ok guys heres the deal. I am so pd off. I finally got my sav back from my lhs the other day after they got my carb nut in for me and i went to run it and it still had an air leak so i syliconed it all up and took it out 2 days later (today) and it was running like a POS so i realised the lsn and the hsn was a whole turn leaner then when i gave it to my lhs. i suspect it was the guy that works there because he was rude to my mum when she was following it up and she complained. well i got that fixed and it was running like a champ wheelies on command and anything. all of a sudden there is no wheelies and a little loss in top speed not much tho. i keep running and whenever i come to a stop and nail the throttle i notice a whole lot of front hweel spin and no back wheel (this is on any surface grass,pavemnt,gravel you name it) and i check the drive shafts to see if the cups have slipped off and there is nothing wrong there and the rear diff is fine. I have no idea what is going on. can someone give me a hand? :confused:

[4DMNYC]

Check your rear diff, you may have stripped the gear housing or a gear .
Check your gear mesh...there is a little bit of play on the stock clutchbell set up, and it may have gotten worse.
Check that the little set screw pin is still in the drive cup. If it vibrated out you'll loose power to the section of the truck that it came out of.
Ckeck you slipper clutch (prolly not the problem but check anyway).

[kawasakirider]

The screws outta the drive cups are fine, the mesh is fine,but if i stripped anything in the diff wouldn't the wheels be harder to turn than usual?

[4DMNYC]

No, they'll actually get easier to turn in most cases. Hold three tires still while you spin only one tire in the rear and see if there is any crunching or anything that seems unusual.

[kawasakirider]

ok i will do that now

[kawasakirider]

Ok well i held both front wheels and the left side back one and i spun the right side. when it moved it clicked every few cm i moved it. to see if this happened in the front i did it and it did the same thing to the front wheel. more of a crunchy click in both of them then a click click

[kawasakirider]

Well i took half of the rear end apart and i found out that the gears INSIDE the diff are broken or whatever (i didn't open it up) because the gears on the outside of it are fine. Does anyone have a rough estimate of how much a hpi 4 gear diff is? preferably AUD