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Hi all

Need help and advice re a problem with a Honda Big Red 350cc 2wd (dont know exact model..sorry!)

The other day, there was a grinding sound coming from the rear wheels which sounded like the friction of pieces of metal.

Then suddenly the rear wheels seized and would not budge even when being pushed in neutral.

Opening up the oil cap on the left rear side, there appeared to be some gloopy black muddy oil residue inside. This led someone to suggest that it may be the rear differential and it would need a new one, saying that this is the most common fault for Honda ATVs, caused over time by a build up of mud and other things.

Is this likely to be the case? If so, is there a way of fixing the problem by avoiding spending loads on a new rear diff? Is there any other problem that this could be?

Many thanks for any help!
 

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we had a 85 big red 250 in perfect condition we sold for $400 but anyway id pull the rear end and look and the drive shaft for anything abnormal
 

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Yeah, like honda440exrider said, pull the rear end and drive shaft out and then make sure the output shaft on the motor is turning when you put it in gear when it's started. If it is, check the splines on the output shaft, both ends of the drive shaft and the end of the pinion shaft coming out of the rear end. If all of this looks good, then you will need to open up the rear end and check for pinion and ring gear damage.
 
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