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Paul Hannan

Honda Trx300 final drive (rear diff)

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Looking for some advice regarding rear diff issue.

I have lost all drive power to the rear wheels from the diff. I have drained the diff oil and have not really found anything to scary apart from the colour of the oil....  Ive jacked the bike up.  Then I took the side cover off the transfer case to confirm drive shaft is all ok. And spins when put in gear etc. Then check the rear diff oil filler where you can see the crown wheel (final gear) that was spinning all ok.

My guess the spline how stripped on something either final drive or the main axle. Main question is how do I tell if the final drive splines are stripped?

Also during the process I managed to bugger the diff oil filler bolt plug thingee! Any ideas where I can get one? I’m in New Zealand if that helps.



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I think you would visibly see if there was gear damage. Are there any metal shavings in the oil? Check out this topic:

Have you done a spline inspection? Check out this video:


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No drain the oil no steel seen. Made a start yesterday pull the shaft out. Hopefully by the weekend I will know more. I’ve tracked down a second hand one. Hopefully that all that is buggered. Any idea on how to flash all the old oil out of the diff. I’m not really wanting to strip it down? Cheers

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