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What happened tensioner mods (Read 846 times)
DragBikeMike
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Re: What happened tensioner mods
Reply #60 -
05/27/18 at 12:51:26
That's an excellent point Batman.
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Armen
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Re: What happened tensioner mods
Reply #61 -
05/28/18 at 06:58:16
Dave
I think the reason for Clymer saying to rotate the engine clockwise is to eliminate the possibility of loosening the alternator bolt. hard to imagine it would loosen, but with the plug in and someone turning rapidly, who knows.
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verslagen1
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Re: What happened tensioner mods
Reply #62 -
05/28/18 at 08:48:11
But if you rotate CW, you engage the starter and risk breaking the case or the teeth on the gear.
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batman
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Re: What happened tensioner mods
Reply #63 -
05/28/18 at 18:34:23
What Versy said! Even more true if you own a 1995 or older bike with straight cut starter gears .
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norm92de
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Re: What happened tensioner mods
Reply #64 -
05/29/18 at 13:48:18
On a positive note:
Our cam chain tensioner may not be the best but the rear of the cylinder has a very clean look and a potential oil leak has been eliminated. Also, I think we are closing in on a scheme to get the maximum life out of the chain.
By the way, how many miles do other engines get out of their cam chains? Anybody got a clue?
I have never owned a particular bike long enough to find out but have never had a problem for 20k or so which I realize is not very many miles.
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Dave
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Re: What happened tensioner mods
Reply #65 -
05/30/18 at 04:09:09
norm92de wrote
on 05/29/18 at 13:48:18:
On a positive note:
By the way, how many miles do other engines get out of their cam chains? Anybody got a clue?
I have never owned a particular bike long enough to find out but have never had a problem for 20k or so which I realize is not very many miles.
One fellow on the 250 Ninja forum got 86,970 miles on his original engine and replaced it due to the cam chain being worn out. On this engine the cam chain is in the middle of the crank between the 2 cylinders, and it requires taking the engine completely apart to replace the cam chain. It is far easier and cheaper to buy a good used motor - there are plenty of good engines from low mileage crashed bikes (that obviously will change as the years pass).
Quote from his post:
I did replace the original engine at 86,970 miles with a 1,700 mile '01 engine, due only to my decision that the camchain was getting excessively worn, and might break before long. If it did break, it might break the crankcase and ruin the engine. But at 86,970 miles the performance was still normal and the oil consumption was still nil, as it always was. The worn camchain was evidenced by being able to be pulled excessively away from the cam sprockets, and no more adjustment available on the adjuster. Probably the camchain guide strips were also well worn. Had it not been that camchain replacement requires the complete dismantling and reassembly of the engine, I would have replaced the chain and guide strips and continued to run the engine.
Link to his thread:
https://faq.ninja250.org/wiki/100,000_miles_on_an_EX250
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Last Edit: 05/30/18 at 05:29:19 by Dave
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batman
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Re: What happened tensioner mods
Reply #66 -
05/30/18 at 16:57:45
I don't believe changing the cam chain on a Ninja would be as hard as people think . The fact that the case seam is horizontal ,make s replacement a bit easier.
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