SV650.org - SV650 & Gladius 650 Forum - Damaged piston (VFR400)

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SV650.org - SV650 & Gladius 650 Forum (http://forums.sv650.org/index.php)

- Bikes - Talk & Issues (http://forums.sv650.org/forumdisplay.php?f=129)

- - Damaged piston (VFR400) (http://forums.sv650.org/showthread.php?t=143956)

fastdruid

15-12-09 10:25 AM

Re: Damaged piston (VFR400)

Quote:

Originally Posted by Spanner Man (Post 2124448)

NC30's have pretty tough engines. However, as the valve shimming procedure is pretty fiddly most garages don't bother doing it. So it is possible to burn a valve.

+1 it is a PITA to do[1] and normally when checked they are fine...

It does make quite difference to starting and running though to have them spot on.

Also balancing the carbs makes a difference and again is a royal pita to do.

Druid

[1] Although doesn't need cams out like the SV as its shim over bucket.

EssexDave

15-12-09 10:26 AM

Re: Damaged piston (VFR400)

I didn't think about the compression test.
That would be why there is no compression if it's not turning over :S

I really don't think I should let them keep my bike.

They want to charge me £50 to tell me i need a new piston..

yorkie_chris

15-12-09 10:36 AM

Re: Damaged piston (VFR400)

Dave I think they're pulling your p*sser.

Quote:

Originally Posted by ThEGr33k (Post 2124508)

Turn it off of the crank? I have no idea how you do a compression test though to be fair :)

You screw the tester into a plug-hole, hold the throttle wide open and crank it.

Alpinestarhero

15-12-09 10:37 AM

Re: Damaged piston (VFR400)

Dave, get your bike back off them, they sound a bit un-clever TBH. Can you get your bike to spannerman? I know he has a fair bit of experiance with those little V4's.

good luck, i hope the engine is ok and its something simpler, keep us updated :D

EssexDave

15-12-09 03:29 PM

Re: Damaged piston (VFR400)

Apparently the engine is turning over. :s

Sudoxe

16-12-09 08:19 AM

Re: Damaged piston (VFR400)

Quote:

Originally Posted by EssexDave (Post 2124854)

Apparently the engine is turning over. :s

Really? From reading the thread, I thought it was you that was being turned over.

Dan

yorkie_chris

16-12-09 12:16 PM

Re: Damaged piston (VFR400)

So they charged the battery and ran a compression test. Ask for what the values were on all pots. And if they had the throttle open when they ran test ;-)

beabert

16-12-09 12:25 PM

Re: Damaged piston (VFR400)

Battery directly to the starter, if it has starting issues.

Need to do it twice if low with and without oil in the bore, as above throttle must be fully open.

EssexDave

16-12-09 03:32 PM

Re: Damaged piston (VFR400)

How hard is it to rebuild an engine given unlimited time and funds?

:p

Alpinestarhero

16-12-09 03:39 PM

Re: Damaged piston (VFR400)

Quote:

Originally Posted by yorkie_chris (Post 2125649)

So they charged the battery and ran a compression test. Ask for what the values were on all pots. And if they had the throttle open when they ran test ;-)

good call, you wouldnt expect there to be no compression on any of the 4 cylinders, unless you had just the most aweful luck in the world

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