[D Bergstrom]

So anyone found another way to upgrade the cam chain yet? I know Alba listed a kit, but it is no longer available. The Alba kit used XR650R HRC parts and a Suzuki DR650 cam chain, but the lower sprocket is now discontinued. Just curious if anyone has come up with anything else. Currently have my motor apart and should be getting my parts back in the next day or so, wouldn't mind upgrading before I reassemble everything.

Doug

 

[Baxter]

I seem to think cam chain of a WR400 fits. Its same length as the xx but the same width as the one on a TRX450r.

 

[TRX700XX]

is there a adjustable timing chain out there for the xx?

 

[D Bergstrom]

I seem to think cam chain of a WR400 fits. Its same length as the xx but the same width as the one on a TRX450r.

I remember that post also Lee where the guy mentioned the WR chain. Looks like they are about $40, probably going to pick one up to compare.

is there a adjustable timing chain out there for the xx?

???? Not really sure what you mean by an adjustable timing chain, do you mean an adjustable cam sprocket? If so, I haven't seen one.

Doug

 

[TRX700XX]

yes adjustable cam sprocket... i added one to my truck and it made a large difference in numbers

 

[boost addict]

Doug...the only guy that i have heard of breaking the cam chain is Matlock Racing.. We are making more power than his build but don't run them as long as you guys do. Until we break one i won't worry about it. Just my .02$

 

[D Bergstrom]

I have heard of a couple other desert guys breaking them, guess the stock one doesn't like being ran for long periods of time. Then I also know others that have never had a problem. Thought about leaving the stock one in untill I do break it, (just replace as a regular maint. item.) but the way my luck has been going lately, it will break at high rpm and piston will meet valves and cause major carnage. Would rather be proactive.

Doug

 

[D Bergstrom]

Figured I would post an update on this. Did a little more research on a WR cam chain. (Actually, 1998-2002 YZ/WR 400's and 426's use the same chain.) I found a used 99 YZ400 cam chain on Ebay for about $15 shipped. I picked it up just to see how it fits the XX. Figured if it all looked good, then I would spend the $40 on a new one. The YZ chain I got looks just like the oem XX chain, same width and all. The only difference is the YZ chain will not fit on the XX cam sprocket, there was a slight gap between the sprocket and chain, looks like the sprocket teeth are a little different between the two motors. Granted, the guy selling it may not have really known what it was for, but as far as I am concerned, a early YZ/WR cam chain does NOT fit a XX.

Looks like I will just be running a oem cam chain and replacing it fairly often.

Doug

 

[Brokenbones]

I tried to find a d.i.d 120l chain still no answer yet. D.i.d offer a special treatment recision engineered for today’s sophisticated engines
Designed for superior durability at high rpm
Low wear means years of dependability
Silent Cam Chain
Special Dai-hard™ treatment forms an extremely hard metallic layer on the pin surface for increased durability
Unique pin-linkplate set-up offers an ideal engaging mechanism for smooth, low-friction power
High tolerance protects against power loss.

Maybe it can be custom made?

 

[5W0P3]

This is going to be my next replaced part to rid my quad of the tinging I still have so I'm subscribing. How much of the motor do you have to take apart to get this chain out?

 

[Baxter]

99.99% of all cam chains in motorcycles are the same 1/4" pitch. If what you say is correct about the YZ/WR 400 chain then it may be worn out. The DR650 is 124 links which kinda makes me think the HRC XR650R did a plus 1 and plus 2 on the cam. The YZ/WR 400 cam chain is 92RHM-2010-120 and if this is the same chain as the XX then a stronger, wider cam chain would be a 92RH-2015-120. This would be ok if you are willing to run a wider cam chain on the stock XX cam gears.

I'll work on finding the right gears.

*note the good typing - typed by Jill ))))

 

[D Bergstrom]

Yeah, that chain is in good shape. The teeth on the XX sprocket won't go all the way into the chain, its like the chain is on top of the teeth, not in the teeth. I would try to get a picture, but don't think it will show what I am talking about. Again, maybe the chain I got isn't really a YZ/WR chain, you know how ebay can be sometimes. I need to check the number of links, since 120 link chains don't seem that popular.

From the research I did, the 96 and later DR650's use a 120 link chain, the 95 and earlier use 124 link. I thought about buying a later DR chain to take a look at, but the cheapest I can find an oem is $80, aftermarket about $50. Don't want to spend that much money unless I knew for sure if it worked or not.

What I need to do is just call Wayne Matlock, he could probably save me a bunch of effort. My cousin has his number, need to get it from him...

Doug

 

[Brokenbones]

Thank Doug for your implication mine is getting streched and i'm worried about it. Also now my small end rod is pretty at the end of the wearing limit.Overall my engine is noisier than my 480r!!! Anyway at over 650 hour this engine passed the test!!!!

 

[Brokenbones]

Hey Baxter, thanks you too, your doiing great with this rare machine. The way i see it's futur it's gonna be a collector piece!!

 

[5W0P3]

Thank Doug for your implication mine is getting streched and i'm worried about it. Also now my small end rod is pretty at the end of the wearing limit.Overall my engine is noisier than my 480r!!! Anyway at over 650 hour this engine passed the test!!!!

How do you know its stretched? Is there a way to test/measure this? Does it make any noise?

 

[MizuriDirt]

How do you know its stretched? Is there a way to test/measure this? Does it make any noise?

You could probably measure degrees of variation just like a timing chain on a car engine. Turn it one direction till it takes out the slack then turn it backwards to see how much slack it has in it. This would show you a combo of chain and gear wear.

 

[D Bergstrom]

Well, sent a message to Wayne over on facebook, and he doesn't have any extra kits, same thing, bottom sprocket is discontinued. Well, I take that back, he did have one kit, but he wanted $8,000 for it, but it came with a free Baja ready 700XX! haha

Oh well, looks like I will just be replacing the stock chain every so often.

Doug

 

[boost addict]

Nate still has them listed for sale. Maybe they haven't updated their site?

http://teamalbaracing.com/product.php?productid=2209&cat=613&page=1

 

[D Bergstrom]

Nate still has them listed for sale. Maybe they haven't updated their site?

http://teamalbaracing.com/product.php?productid=2209&cat=613&page=1

Yeah, I talked to them in December and they said they can't sell the kits anymore since they can't get the lower sprocket. Who ever the guy I spoke to on the phone asked if I saw the kit on their website. After I said yes, he said I guess we need to take them off of there, guess they haven't got around to it...might just give them a call anyway next week.

Doug

 

[Baxter]

The cam drive sprocket is the hard part. I have not looked into further as ,I am waiting for someone to build a stroker crank. The cam sprocket is there ,as is the stronger cam chain. I'll do some digging and try and find a alternative drive sprocket. I have the HRC part number ,so it should not be too difficult to find !:argh: