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Discussion in 'Thumpers' started by onaXR, Jan 18, 2006.
I haven't started yet, hopefully I will be doing it in about 3 weeks
Your going to have to remove the tensioner and shaft and test the one way clutch. Hold the shaft (by the flat at the end of the shaft) with a pair of vise grips and see if you can get the clutch to skip when pushing backwards on it. Perhaps there are wear or flat spots on the shaft that are allowing this to happen. You do know that if the chain tension is not controlled that the chain can jump some teeth and even allow the valves to hit the piston. You don't want this to happen do ya??
Okay that makes sense, if the locking mechanism fails eventually the spring will fail because it's not meant to hold pressure forever. Cam chains that jump teeth never have a happy ending, uhhem, my long gone '70 Bronco and sourjon backing down a hill in gear using the clutch are strong reminders for me.
Hahaha seems you have enough money to buy beer. Make a choice... beer or gloves?
Hey I jumped a timing chain a '85 KLR600 back in '87 backing it down a hill doing that. I'll never forget the sound the engine made when I hit the electric start. It broke both exhaust valves and stuck them into the head...
That was my last KLR...
Stainless Steel Made
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My wife is okay with me buying beer (a little at a time). Not so hot on the expensive gloves all at once. I moved my controls around a bit and I can use my snowboarding gloves now. Problem solved (for now).
Tis true,no mess,no fuss......no video till spring.......though i do think it`s comical me making a video to instruct on oil changes on sumpin as basic as the LPIG
Thanks Steve, Ya I thought that they were different.
with Flatfenders recent timing chain issues i now am riding paraniod-kind of.
1. what causes a timing chain to jump? besides backwards motion in gear.
and how can i prevent that?
2. what are the symptoms of a timing chain that has been jumped
will the L still lift the front wheel in 2nd and 3rd and perform the same or will you be able to detect it right of way.
Thanks for helpful insight and advice
How does one tell if the suspension in my bike is stock or modded? I think the springs might have been changed to stiffer ones but can't really tell.
If memory serves me there will be different colored stripes painted on one end of the shock spring. What colors mean what I can't say. The fork springs you will need to remove and take a couple of pics of for the more learned here to see.
Springs over the years were different colors. you'd have to test the displacement with weights to get an accurate assessment .
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Yep. Pretty sure my '93 has a stock spring and it's red. My friend's '03 has a yellow spring that's stock.
Just want to keep this fresh and not get burried....... GURU's feel free to provide help please
I'm not a guru but I had timing chain issues. All from a rebuild I did trying to save the budget. The chain was stretched and it allowed it to skip a couple teeth when I used the clutch to brake as I rolled backwards on a hill I failed to clear. It wasn't enough to damage the motor when I tried to restart but it was enough that the bike wouldn't start and run. New chain installed and I've used the clutch getting off the trailer several times no problem.
Since I am at work I have plenty of time to reply to your inquiry.
This is based on my '91 XR600. I used to go riding in Mendocino National Forrest and there were many times that I would get stuck going up a hill and I would walk the bike back down using the front brake and also the clutch while the bike is in gear. I would have both feet on the ground as to not fall over so the in gear/clutch bit was actually the rear brake. I can remember letting the clutch out and the engine winding backwards and I never had a problem with the cam chain jumping no matter how I punished this bike.
Now as to the why and how of a jumping cam chain. It all comes down to the tensioner. The tensioner has a one way clutch in it. If the clutch rollers develop a flat spot or the shaft is worn then there is the possibality that the tensioner will not be exerting pressure on the chain guide and under certain conditions the chain can jump or skip on the cam gear. How to prevent this from happening?? Don't ride your bike. If you ride your bike you wear out parts. No ride = No wear. Simple.
Same bike. Now as to having the cam out of time. A couple years ago the engine did the standard oil starvation bit after an oil change. Upon tear down I found that the last time I was in the engine I had installed the cam one tooth advanced. The bike always started up just fine and had loads of power so what does this mean? It's a friggin HONDA!!! If the cam is advanced you get the cam timing coming in more on the low end. Retard the cam timing and you get more top end. Change the cam timing a bunch of teeth as in a bad tensioner/chain skipping and you get valves that are hitting the piston.
There you have it. Send BEER.
^ Thank GOD it's UNION...
Really thanks for the Input Steve @7200 miles should i even be worried about cam tensioner wear / flat spots?
or at that mileage consider maybe checking and adjusting valves?
Union and a CITY job at that. Fuck yeah bitches.
Sitting here eating my Cheerios and waiting for the phone to ring.
At 7200 miles you don't have to worry about the cam chain tensioner but your way late on checking the valves. I just serviced a kid here at work 2008 XRL with 8K on it and he was complaining that the bike kept dying and took repeated starts. No wonder. The left exhaust valve had ZERO clearance. He came over to pick it up yesterday and I had him start it in the garage. Full choke and hit the Go button. Fired right up and setteled down to a nice idle with no choke after 10-15 seconds. It never did this before he exclaimed!!
Ok... valve check it is... might do it today,, or next weekend