Strange noise from rear cylinder

[Mark lindsay]

I have a noise from rear cylinder sounds like a scraping or grinding noise I have replaced cam chain tensioner and noise still ther noise gets louder at idle wen open throttle I have a hole in exhaust near cat converter and downpipe near rear cylinder could that affect this sound I will post a video of bike running soon

[♠️ M77]

Did you manage to get a video?

If you hear metal scratching sounds going up and down rapidly near the valve head/cylinder barrel.  Thats the piston rings

Is that what youre hearing?

[Mark lindsay]

so new piston and rings then should solve the problem then?

[Mark lindsay]

so new piston and rings then should solve the problem then? Also there is smoke coming from the rocker cover when engine running

[♠️ M77]

Mark lindsay wrote:

so new piston and rings then should solve the problem then? Also there is smoke coming from the rocker cover when engine running

Quote

Have you taken apart the motor or has the mechanic looked at it?

What kind of smoke? from where? is the cover loose? is there a spillage of oil? A bit more info helps.

 

[Mark lindsay]

Smoke from the rear cylinder smells like oil and sound of scraping metal on metal

[♠️ M77]

It means time to change:

• Barrel , Piston with Rings , Tensioner

And likely also:

• Check valves aint bent.
• Cam chain isnt worn down or replace it ideally
• Change tappet numbers (WHEN you do timings and clearances , *must be done* )

As with new parts, run it in for few hundred miles.

[Mark lindsay]

Do you know torque settings for the bolts of the cylinder?

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