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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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Old 04-16-2016, 10:53 AM
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Martin-EC300 Martin-EC300 is offline
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Default Is this the dreaded PV rattle??

Firstly thanks to all who helped me with advice in my previous thread, the bike is now back together and is running rather sweet on a zero hour piston... That is until I ride it

What d'you guys think.... It sure as hell ain't the chain..lol



https://vimeo.com/163089683


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Old 04-16-2016, 10:55 AM
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https://vimeo.com/163090099
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Old 04-16-2016, 02:21 PM
Capz85 Capz85 is offline
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Sounds very similar to the noise ive been getting, richening the jetting has taken the noise away.

When mine was doing it as loud as that it was scuffing the bore, pull the pipe off and check it's not doing the same to yours

Hopefully it is the pv having a good rattle, have you looked at the pv rod, sometimes they rattle on the cylinder, just a case of tweaking it so it sits clear
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Old 04-16-2016, 02:53 PM
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Thanks...Actually the rod was extremely close (maybe even touching)

It did it before the new piston but not this loud, cylinder bore is fine for now
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Old 04-16-2016, 03:27 PM
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Hopefully it's just that
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Old 04-16-2016, 06:38 PM
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Quote:
Originally Posted by Martin-EC300 View Post
Firstly thanks to all who helped me with advice in my previous thread, the bike is now back together and is running rather sweet on a zero hour piston... That is until I ride it

What d'you guys think.... It sure as hell ain't the chain..lol



https://vimeo.com/163089683
Why isn't it the chain? What have you done to rule it out?

What happens if you pull the clutch when it's doing this? Does it stop right away? What happens if you click up/down a gear? Do you have a bash plate on the bike?
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Old 04-16-2016, 07:12 PM
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Yep, sounds like chain slap. If your engine sounds that bad you won't be riding far. btw your riding on the wrong side of the road.
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Old 04-16-2016, 08:58 PM
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Eliminate chainslap as the cause first,retension or try dragging rear brake at the same time as it starts to rattle.
Could be the powervalve arm as you have had the topend off.remove header pipe,remove rhs pv cover,refit pipe and start engine.bring revs up to problem area and watch the arm closely..
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Old 04-16-2016, 10:24 PM
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Sounds like chain slap to me.
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Old 04-17-2016, 03:02 PM
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Well I feel really stupid! I was 100% sure the wasn't the chain, however I completely forgot I went down a tooth on the front while the bike was in bits ... I'll get my coat
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