I dont think the issue is the aluminium bearing... its quite common on cars crankshafts. from what I can see there is there is a distinct lack of lubrication on the lower part of the bearing, and that is the cause. I see Duncan Wood has the right idea described there... I find that kind of issue very strange from a Honda, but there you have it. Nice fix you got going on there. Any word on how long its lasted so far?
my xr400 has a little wear, but most of the cam sits on the bearing caps. I heard when the head gets hot, it expands up to the cam. Would I be ok if I just got the journal smooth?
They All Seem To Fail in the Same Place- Bloody Cam Journals !!- I Wish They Had Made Them With Plain Bearings/Bushes to Replace- My Dads an Old Fitter & Turner - & He Used The Same Method That You Are Doing to Fix a DR250r - He Turned Down a Bronze Bushing & Sliced it into 2 Pieces, Made Some Grooves For Better Lubrication & Set Them In With 'Quick Metal' Epoxy- It Was a Time Consuming Exercise- But Worked!! - Cheers👍😀🍺🍻
I would think if the design is a flaw, and if the cam sits on the bearings, you could smooth the journals and leave it. That would allow for more oil to get in there can more lubrication.
I’m doing this today, I’m using a thicker bronze bush than this and planning to make it so when the cam holder is tightened up it holds the bush in place, more the way a crank bearing fits a car engine. Only problem is a lot more hand machining
@@hunter2890 I sold it after a few months, no reason why it would have not lasted, the bronze is stronger than the alloy and was totally captured between the head and cam. I picked up the remains of 7 CRF80s and 100s from a motorcycle hire company, a lot of the engines had similar cam issues
this repair is good and great depending on the camshaft /journal situation and how far gone the issue is .. i was going to do this on mine .. but when i pulled the motor apart the camshaft had worn so much that the "camshaft wobble " caused the camshaft chain to jump off the camshaft gear which in return also bent the camshaft chain and worn on on the top camshaft holder which is harden steel( if thats out of line it all will be).. so considering that happen . that would mean the head itself maybe able to be saved and brassfitted .. so much for a cheap repair on the 100$ bike i picked up i now have to replace the camshaft holder and camshaft, camshaft chain along with doing the brass modifitcations if i go this route which will cost at least 40-50 even used and around 100$ new parts . somthing to think about
Very clever idea, I like that you've thought outside the box.
I dont think the issue is the aluminium bearing... its quite common on cars crankshafts. from what I can see there is there is a distinct lack of lubrication on the lower part of the bearing, and that is the cause. I see Duncan Wood has the right idea described there...
I find that kind of issue very strange from a Honda, but there you have it.
Nice fix you got going on there.
Any word on how long its lasted so far?
100% cheap and easy fix for a kids bike thank you for posting this saved me a bit of money on the boys bike!! Thanks!!👍👍👍👍
Do you use some sort of adhesive to Keep the brass bearing in place? Or is just bolting the cam and tower down on top enough to hold it?
my xr400 has a little wear, but most of the cam sits on the bearing caps. I heard when the head gets hot, it expands up to the cam. Would I be ok if I just got the journal smooth?
They All Seem To Fail in the Same Place- Bloody Cam Journals !!- I Wish They Had Made Them With Plain Bearings/Bushes to Replace- My Dads an Old Fitter & Turner - & He Used The Same Method That You Are Doing to Fix a DR250r - He Turned Down a Bronze Bushing & Sliced it into 2 Pieces, Made Some Grooves For Better Lubrication & Set Them In With 'Quick Metal' Epoxy- It Was a Time Consuming Exercise- But Worked!!
- Cheers👍😀🍺🍻
is this a legitimate fix. im familiar with those types of bearings but im curious low long it holds up
That's very smart like I have the same problem and now that someone smart like u has showed us a way it can be fixed ill have to try that lol thxs man
my pieces are coming in today im really looking foward to seeing if it works😂 this is so cool
After two years did it work 🤣🤣
Wondering if u see this comment plz what’s the part u got
I would think if the design is a flaw, and if the cam sits on the bearings, you could smooth the journals and leave it. That would allow for more oil to get in there can more lubrication.
Good deal I did a similar repair with brass still running
I’m doing this today, I’m using a thicker bronze bush than this and planning to make it so when the cam holder is tightened up it holds the bush in place, more the way a crank bearing fits a car engine.
Only problem is a lot more hand machining
It’s been two years… did it hold up?
@@hunter2890 I sold it after a few months, no reason why it would have not lasted, the bronze is stronger than the alloy and was totally captured between the head and cam. I picked up the remains of 7 CRF80s and 100s from a motorcycle hire company, a lot of the engines had similar cam issues
@@vintagetintrader1062 hahaha I literally just got done lathing a bushing yesterday, thanks for the info
good idea. would love to know how it holds up.
Any extra head for sale ???
Can you tell me how to contact the man who repairs the head via mail?
can you update the description to list the bronze bushing part #
McMaster-Carr part number: 6658K43 20mmx24mmx16 might have to take some off the length, found some on Feebay also.
if you search on Feebay you'll find some that are thinner, 20mmx23mmx16 or similiar. The thinner the less you have to take off the head.
this repair is good and great depending on the camshaft /journal situation and how far gone the issue is .. i was going to do this on mine .. but when i pulled the motor apart the camshaft had worn so much that the "camshaft wobble " caused the camshaft chain to jump off the camshaft gear which in return also bent the camshaft chain and worn on on the top camshaft holder which is harden steel( if thats out of line it all will be).. so considering that happen . that would mean the head itself maybe able to be saved and brassfitted .. so much for a cheap repair on the 100$ bike i picked up i now have to replace the camshaft holder and camshaft, camshaft chain along with doing the brass modifitcations if i go this route which will cost at least 40-50 even used and around 100$ new parts . somthing to think about
What is the piece of hardware that you went and got for it called?
McMaster-Carr part number: 6658K43 20mmx24mmx16 might have to take some off the length, found some on Feebay also.
@@bobybobbison thanks
I shimmed mine with FEELER GUAGE STRIP - lasted ok for a while.... but i want a better fix WE WANT BEARINGS !
G'Day from Melbourne Australia
Those are the cam bearings that are worn, not the journals. The 'journals' are the part of the cam that rotate in the bearings.