Author Topic: Cb650: welding hyvo cam chain (Read 12226 times)

my79650 · « **on:** May 01, 2013, 08:47:53 AM »

Was checking my timing while waiting for clutch plate order to show up and i adjusted the tensioner as well. MY chain is riding up on the cam sprocket as i turn the engine over by hand. I removed the tensioner and it was stuck. Got it working again and i still have the same thing happening. Crappy cell phone pictures i know. Has anyone popped a rivet on a hyvo cam chain to feed it through and mig weld the link back together? If i can do that and not split the cases i'm all for it. Up here in New Brunswick Canada i couldn't get a chain with a master link., only the sealed type. Chain got here quicker than my clutch plates. Any thoughts on this?

my79650 · « **Reply #1 on:** May 01, 2013, 08:49:35 AM »

Despite the crappy look of the photo, if you look closely you can see some light under tht chain near the sprocket, another photo.

lucky · « **Reply #2 on:** May 01, 2013, 01:27:32 PM »

You cannot weld a hardened steel chain, it will just crack on the weld.

Vinhead1957 · « **Reply #3 on:** May 01, 2013, 01:56:26 PM »

You can grind the head off the rivets use a chain breaker to remove a link and replace the chain with a removable link or use the same chain breaker to install a non removable link. I've done drive chains I would think a cam chain is a chain is a chain

kghost · « **Reply #4 on:** May 01, 2013, 02:09:49 PM »

I'm with lucky. Bad idea

my79650 · « **Reply #5 on:** May 01, 2013, 10:20:01 PM »

My mechanic buddy at his shop split the new chain for me. He used a small punch and ground the tip down to match the link pin and slowly knocked it out. He said to just file the pin a little and it can slide back through and mash it all together with a ball peen hammer. He claims it won't fly apart as your mashing both sides of the pin to the link plates. I got my old chain to practice with off my parts bike.

lrutt · « **Reply #6 on:** May 02, 2013, 05:37:13 AM »

never seen that done with a Hyvo type chain though.

iron_worker · « **Reply #7 on:** May 02, 2013, 08:17:39 AM »

If possible, I would at least look for a new rivet. Once you've ground the head off the old one there won't be much left create a new head on it.

IW

lucky · « **Reply #8 on:** May 02, 2013, 09:05:03 AM »

Quote from: my79650 on May 01, 2013, 10:20:01 PM

My mechanic buddy at his shop split the new chain for me. He used a small punch and ground the tip down to match the link pin and slowly knocked it out. He said to just file the pin a little and it can slide back through and mash it all together with a ball peen hammer. He claims it won't fly apart as your mashing both sides of the pin to the link plates. I got my old chain to practice with off my parts bike.

I agree.
This is the right way to do it.
That pin needs to be a hardened steel pin. But not a drill bit. That could crack.
You need to use a pin that comes with that chain.

crazypj · « **Reply #9 on:** May 02, 2013, 09:15:21 AM »

Quote from: my79650 on May 01, 2013, 10:20:01 PM

My mechanic buddy at his shop split the new chain for me. He used a small punch and ground the tip down to match the link pin and slowly knocked it out. He said to just file the pin a little and it can slide back through and mash it all together with a ball peen hammer. He claims it won't fly apart as your mashing both sides of the pin to the link plates. I got my old chain to practice with off my parts bike.

I used to do that on CB900F's, it's a major job to split cases because the motor is so damn heavy
Probably did 15~16 over 3 yr period
It's best if you punch both pins on plate, makes it easier than completely removing single pin

my79650 · « **Reply #10 on:** May 02, 2013, 09:40:14 AM »

Got a few photos; need to get an actual camera instead of depending on cell phone; pardon the clarity; pin is out of new chain, minor burr on one end, can be filed a little to help with reassembly.

my79650 · « **Reply #11 on:** May 02, 2013, 09:47:42 AM »

1st pic is the separated new chain; 2nd is the pin from said chain; 3rd is broken old chain from parts bike to practice with myself. Pin from new chain is to be placed back into links after fed back through. Only grinding involved will be to the old chain on my engine. But i am going to try another tensioner first just in case the one in the engine is NFG. At least i won't have to wait around for a new chain if the replacement tensioner does not make any difference to the current chain on the engine.

Don R · « **Reply #12 on:** May 02, 2013, 12:22:42 PM »

I was told once a master link from a CB450 cam chain could work. Anyone heard that one?

crazypj · « **Reply #13 on:** May 02, 2013, 06:38:22 PM »

450 is roller chain

trueblue · « **Reply #14 on:** May 03, 2013, 03:40:07 AM »

When I replaced the cam chain on my 650 I used a chain breaker and pushed the pin out, but left it in the last plate of the chain. I then broke the chain that was in the bike, wired the end of the old chain to the new chain. Wound it through once it was round I just removed the old chain and pushed the pin back through with a set of vise grips. The pin is a press fit in the links so doesn't need peening over. Mine has held no worries for over 5000 miles

. The trick is don't remove the pin completely from the last plate because you will never get it back in

.

my79650 · « **Reply #15 on:** May 03, 2013, 07:47:30 AM »

Why won't the pin work? It will; once the slight burr is filed off it will slide through. The trick is to get all the plates in order. You have to peen it on both ends to hold it all together. The chain is pressed together on each link in a factory press. You have to peen it over or it will fly apart again, especially if the link pin is completely removed like mine is. I don't trust the press fit and leave it idea.

crazypj · « **Reply #16 on:** May 03, 2013, 09:09:37 AM »

It works fine, if you find the original rivet link it's an 'easy' job
I only did 2~3 with full engine strip to change chain, otherwise it was separate both chains, connect new to old and run around crank sprocket
Galea chain services made a business of 'onsite' cam chain replacement, no idea if they could get 'soft' links though?

my79650 · « **Reply #17 on:** May 04, 2013, 02:52:26 AM »

We separated the chain at the joining link; it was a different shade color than the rest of the links. I got another adjuster from the salvage yard for $10. It looks like an OE part. Will try that first; if no change in the slack then i will feed the new chain through.

my79650 · « **Reply #18 on:** May 04, 2013, 04:11:41 PM »

Adjuster has a real strong spring in; better than the one out of the motor.

my79650 · « **Reply #19 on:** May 04, 2013, 04:15:16 PM »

Pic 1: wider on the paddle; looks like it is an OE part; don't know for sure. Pic 2: taller than the old adjuster. Got it installed; oil pan is off to check for proper groove location. Install the head and cam tomorrow. Hopefully this works; if not then i split the chain and feed the new on through!

my79650 · « **Reply #20 on:** May 05, 2013, 04:30:07 PM »

All that work for nothing. Replacement tensioner never made a difference! At least i got a helicoil installed since i stripped the threads in front bolt by #3. Splitting the old chain and feeding through tomorrow after work!

my79650 · « **Reply #21 on:** May 08, 2013, 01:53:21 AM »

Fed through and pinned back together; had to remove cam to make room for miniature old press type clamp from grandfather's tools.

my79650 · « **Reply #22 on:** May 08, 2013, 01:55:19 AM »

Broke the tool pressing pin into place; sh!t happens; peened both ends; now to install cam and time it up, then adjust tension before i install rocker arms and covers.

scunny · « **Reply #23 on:** May 08, 2013, 03:04:44 AM »

just make sure you have the bottom of the tensioner seated in it's wee spot. think I read you pulled the pan but have had a coupkle and about to check out the SSB.

my79650 · « **Reply #24 on:** May 08, 2013, 02:38:43 PM »

It's definitely in the groove; had the pan off 3 times; 1st was cause i had to get the damn thing in the groove; 2nd was to get aluminum out where i drilled and added a helicoil to front bolt by #3; 3rd time was when i dropped it again cause i broke a ring on #3 when i put it together after the helicoil incident. Stole a ring off #3 from my dead engine. Cleaned up all metal filings from drilling and the ring replacement. I probably won't be the first or the last to take a used ring out of an old engine to put in a runner. Sucks that every time i need something it takes a week to get here! Other than that i like my bike enough to avoid making a payment on another!

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Author Topic: Cb650: welding hyvo cam chain (Read 12226 times)