Bottom end knock - Honda TRX Forum
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post #1 of 11 Old 10-06-2018, 05:43 PM Thread Starter
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Bottom end knock

Hello all I'm in need of some major help i just got done putting a fresh top end on my 87 trx250x and now I come to find that there is also a knock in the lower end and I'm not sure where to start I've been looking for a lower end kit for it but with no avail just used cranks on Ebay. the video I'm posting is hard to tell but the noise you hear is not exhaust it's the horrible knock
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post #2 of 11 Old 10-06-2018, 06:00 PM
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Contact: MrCrankshaft ATV Crankshaft repair site.
email: [email protected]
Phone: 270-205-3222 or 270-527-8921

He can fix your old crank or supply you with a rebuilt one for a very reasonable price. He helped me out on a crank that I could not get either aftermarket or OEM and I could not find a rod kit for either.
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post #3 of 11 Old 10-06-2018, 06:03 PM Thread Starter
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@Here 2 help thank you I will check it out I'm roayally upset I didn't catch this before 😞 got a ride two states away next month and gotta have this ol girl goin
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post #4 of 11 Old 10-06-2018, 08:12 PM Thread Starter
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Update I just went and took everything apart again just to double check the crank and rod and I could not feel any play at all in either.... any and all suggestions are welcome I'm at a complete loss
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post #5 of 11 Old 10-07-2018, 02:32 AM
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Give us the details of your TE rebuild - what did you do to it?
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post #6 of 11 Old 10-07-2018, 02:49 AM Thread Starter
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@Here 2 help I had the cylinder bored over and put new piston rings and gaskets in. When I took the covers off I found slivers of metal and plastic in a channel on the bottom of the case. A buddy and I are thinking those may have come from the timing chain guides
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post #7 of 11 Old 10-07-2018, 02:56 PM
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Hard to tell by the pic, but there is no bronze material in the cam chain tensioner or guide. Is any of the material magnetic and is that bronze looking stuff bronze or something else?

It's easy to tell if the material is off the chain guide or tensioner - just look at them.

If that bronze looking stuff is bronze - it probably came off the lower end of the rod - it's the only place (other than the transmission) where bronze is used.
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post #8 of 11 Old 10-07-2018, 06:17 PM Thread Starter
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@ here 2 help I think what your seeing is just the oil on the metal shavings I'm learning as I go with this I was getting ready to split the case with the help of someone who knows what they are doing and found damage to my oil pump right under where the timing chain rides
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post #9 of 11 Old 10-07-2018, 06:19 PM Thread Starter
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@Here 2 help this is the best picture I could get of the guide its definitely worn
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post #10 of 11 Old 10-08-2018, 05:00 PM
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That is the tensioner - the guide is on the front side

From the pic, the tensioner does not look severely worn - most of the wear occurs at the very top (where your finger is) and at the very bottom. The wear on the oil pump is from a defective cam chain. The top of the pump prevents the chain from coming off the crankshaft sprocket.

Did you install a new cam chain? If not - do it now
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