V7 Stone Noisy cylinder

[v65tt]

Been looking into my v7 stone engines odd noises, very mechanical and knocky below 2500 rpm ( like piston slap) but soon as she clears 2500 she's lovely and smooth till the rev limiter. 

stripped my new engine to discover that the left hand piston is the wrong way round from the factory...!

the arrow is pointing to the rear on the left hand cylinder and  the arrow points to the front on the right hand cylinder



Cannot find any movement or damage anywhere, even the carbon pads are like new, no movement in bottom end either.

Are low rpm nocks normal for the v7 single point engine.


Have 2 v7 II engines here and i have never seen so much carbon build up on heads and pistons in my life!

my old v65tt engine was just lightly sooty after 25k miles!

[rocker59]

Hmmm... the left cylinder on my 2014 is a little noisier than the right.

[normzone]

Alright...I'll play the fool here.

Is it possible it's a universal piston designed to go in both sides, with the arrow aligned differently for differing sides ?

I know, doesn't sound likely, but...

[pete roper]

Alright...I'll play the fool here.

Is it possible it's a universal piston designed to go in both sides, with the arrow aligned differently for differing sides ?

I know, doesn't sound likely, but...

No.

[DaSwami]

Have 2 v7 II engines here and i have never seen so much carbon build up on heads and pistons in my life!

my old v65tt engine was just lightly sooty after 25k miles!

Wait what?  Details please. 

[pete roper]

Wait what?  Details please. 

It's been your winter hasn't it? Lousy signal from ETS. They always run black in winter.

Pete

[DaSwami]

What is ETS??  Google is no help

[pete roper]

Engine temp sensor.

[DaSwami]

Engine temp sensor.

Thanks...makes sense.  It seems the oil on my CB1100 looks very dark after just a few runs in 30 degree temps, I bet on an oil cooled motor really cold temps bugger the works.  So would it be true it would all burn off in the heat of summer??

[BigDave in PA]

I'm assuming that they are valve reliefs in the piston. The smaller one would definitely go to the front cause the intake is the larger valve. It doesn't look like there was any contact though.

[Muzz]

 

That Luigi!!! He needs a good  and a good  and a  for good measure. Then I hope the    chimes in as well.

That is inexcusable.

[v65tt]

it ran fine with about 9000km on   ( bar engine i bought for project v7TT number 2)

Anyone else find there single throttle body V7's very knocking below about 2500 rpm?