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Xt 600 e 4PT -- weird noise Xt 600 e 4PT -- weird noise
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  #1  
Old 24 Feb 2017
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Xt 600 e 4PT -- weird noise
Here's the story so far, after a coil failure and replacement ,I heard a metalic clang/ping ,seemed to be coming from the right side of the cylinder barrel ( could be resonance from the fins ). The noise appears at around 2000rpm if the revs are brought up slowly ,or the choke has the engine running at that speed .
The pings seem to correspond with a slight hesitation in running which can just be detected in the exhaust note . No noise if the throttle is opened quickly ,at higher revs or on the overrun.
I had thought that maybe the coil failure had damaged the TCI unit and upset the advance around the 2/3000rpm range and was causing pre ignition ,so I swapped it with a known working unit ,no change .
Before the coil failure I heard no noise but this could be coincidence.
The bike rides fine ,it's jetted to suit the open airbox and after market silencer and will manage about 95 mph on a 16 tooth gearbox sprocket .
The bike starts fine if the air temp is 5deg C and above ,a bit difficult at lower temps but only after the coil failure ,before that it started fine at -10 deg C. 50,000kms on the odo ,uses a wee bit of oil .
Any suggestions before I dismantle it to check the piston and bore ?
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Old 24 Feb 2017
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http://www.horizonsunlimited.com/hub...eck-your-73934

Mezo.
Last edited by Mezo; 25 Feb 2017 at 01:21.
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Old 24 Feb 2017
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I couldn't get Mezo's link to work, but here is another link
http://www.horizonsunlimited.com/hub...eck-your-73934

Make sure you check both the crankshaft keyway and the adjacent balance shaft keyway.

Bob
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Old 26 Feb 2017
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is this really that bad ?
[IMG][/IMG]
[IMG][/IMG]

This is the key out of the crankshaft ,the nut wasn't very tight ,awaiting a clutch holding tool before dismantling the balancing shaft ( left hand thread ? )
Could this really have caused the noise ?
Assumption ,Bobmech, damn right , I was assuming the fault was related to the coil failure .
Last edited by Wee Ginger dog; 27 Feb 2017 at 20:16.
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Old 1 Mar 2017
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Key play and rattly noise /
Having taken off the clutch and drive pinions ,I can point out ,that the big key that gets the hammer is the crankshaft pinion key . The balance shaft key is tiny by comparison ,also the crank nut if torqued to 85 ft/lb ,the balancer to 43 and the clutch to 65 .Just puts into proportion load .
I filed down 7mmx8mm key steel ( a common size in engineering )to 7x7.1mm. I arrived at the 7.1 width after starting at 7.25 and filing down to a snug fit ,tells me the crank keyway is a little worn . No idea if this cures the noise ,still waiting for new tab washers before putting it all back together and trying it .
THE BALANCE SHAFT NUT IS NOT LEFT HAND THREAD ,in spite of the marks on the nut flats that either indicate unf or left hand thread as in fuel gas unions .
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Old 4 Mar 2017
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that would be an ok key in my book.
for whatever it's worth,in the only motor i opened that had a sheared key, it was the balancer shaft one.
if there's on ething i would check is that the rotor (and therefore ign. timing) has not sheared the key.... easy to verify
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