Smoking SV. - SV650.org

Nobbylad · 14-05-12, 09:21 AM

Bike has taken up the nasty habit recently. Tend to notice it more after I've been riding M-way speeds then come to a stop and it idles for around 30 secs or so, then queue the blue smoke billowing out.

It's using more oil so I guess that's the cause of the smoke, just need to figure out the cause of the leak....piston rings?

I'll be checking the valves this weekend (will hit 40k this week, probs tomorrow) and also balancing it all, but what else other than piston rings cause this?

flymo · 14-05-12, 09:45 AM

do a compression test, should confirm one way or another.

Nobbylad · 14-05-12, 09:50 AM

This any good or would people recommend something else?

http://www.halfords.com/webapp/wcs/s...Id_255216#tab3

johnnyrod · 14-05-12, 09:52 AM

Could be valve seals, under engine braking the oil is pulled past the leaking ones into the cylinder due to the vacuum, won't smoke when on the throttle (once the oil has been burned off of course)

flymo · 14-05-12, 09:54 AM

Quote:

Originally Posted by Nobbylad

This any good or would people recommend something else?

http://www.halfords.com/webapp/wcs/s...Id_255216#tab3

They work fine, I have one just the same. It does the job.

Nobbylad · 14-05-12, 10:43 AM

So in order of priority:-

- check valve clearances
- check compression

Anything else?

flymo · 14-05-12, 10:50 AM

Check compression first, if that's good then I wouldn't bother with valve clearances yet. Usual sign of a problem would be a significant difference in compression between cylinders, very unlikely that a ring/valve would go in both at once.

When did you last check clearances? Do you still have the baffle above the engine breather hose inside the air-box?

Also.... didn't you mention water in your oil a little while ago? Did you figure out the reason for that?

Nobbylad · 14-05-12, 10:57 AM

Clearances last checked at 30k I think, but would need to check.

If by baffle above the engine breather hose, you mean the sponge on the left hand side as you look down into the airbox, facing forward, then yes, that's still there.

There was a lot of oil on the last oil filter, haven't checked the Pipercross one I fitted recently yet (it was fitted after the smoking began).

The milky oil was straight after I fitted the CNC clutch cover and curvy crankcase cover. Again, the smoking started before this swap.

flymo · 14-05-12, 11:04 AM

Quote:

Originally Posted by Nobbylad

Clearances last checked at 30k I think, but would need to check.

If by baffle above the engine breather hose, you mean the sponge on the left hand side as you look down into the airbox, facing forward, then yes, that's still there.

Yep, that's the one. It's there to catch oil as it vents from the engine and prevent too much of it getting sucked back into the cylinders.

Quote:

There was a lot of oil on the last oil filter, haven't checked the Pipercross one I fitted recently yet (it was fitted after the smoking began).

You mean the air filter? Obviously this shouldn't be covered in oil, if the new one is the same would be interesting to figure out where this is coming from. Is one side of the filter more oily than the other (input vs output)?

Nobbylad · 14-05-12, 11:09 AM

Sorry yes, air filter. It was definitely oily, but from memory, was in the centre of the air filter as opposed to one side.

YC may remember better than me, he's young lol

14-05-12, 09:21 AM	#1
Nobbylad Member Mega Poster Join Date: Jun 2008 Location: West Lancs Posts: 4,055	Smoking SV. Bike has taken up the nasty habit recently. Tend to notice it more after I've been riding M-way speeds then come to a stop and it idles for around 30 secs or so, then queue the blue smoke billowing out. It's using more oil so I guess that's the cause of the smoke, just need to figure out the cause of the leak....piston rings? I'll be checking the valves this weekend (will hit 40k this week, probs tomorrow) and also balancing it all, but what else other than piston rings cause this?

14-05-12, 09:45 AM	#2
flymo Member Mega Poster Join Date: Jan 2008 Location: North West Posts: 3,124	Re: Smoking do a compression test, should confirm one way or another.

14-05-12, 09:50 AM	#3
Nobbylad Member Mega Poster Join Date: Jun 2008 Location: West Lancs Posts: 4,055	Re: Smoking This any good or would people recommend something else? http://www.halfords.com/webapp/wcs/s...Id_255216#tab3

14-05-12, 09:52 AM	#4
johnnyrod Member Mega Poster Join Date: Jul 2003 Location: Doncaster, oop norf Posts: 2,128	Re: Smoking Could be valve seals, under engine braking the oil is pulled past the leaking ones into the cylinder due to the vacuum, won't smoke when on the throttle (once the oil has been burned off of course)

14-05-12, 10:43 AM	#6
Nobbylad Member Mega Poster Join Date: Jun 2008 Location: West Lancs Posts: 4,055	Re: Smoking So in order of priority:- - check valve clearances - check compression Anything else?

14-05-12, 10:50 AM	#7
flymo Member Mega Poster Join Date: Jan 2008 Location: North West Posts: 3,124	Re: Smoking Check compression first, if that's good then I wouldn't bother with valve clearances yet. Usual sign of a problem would be a significant difference in compression between cylinders, very unlikely that a ring/valve would go in both at once. When did you last check clearances? Do you still have the baffle above the engine breather hose inside the air-box? Also.... didn't you mention water in your oil a little while ago? Did you figure out the reason for that?

14-05-12, 10:57 AM	#8
Nobbylad Member Mega Poster Join Date: Jun 2008 Location: West Lancs Posts: 4,055	Re: Smoking Clearances last checked at 30k I think, but would need to check. If by baffle above the engine breather hose, you mean the sponge on the left hand side as you look down into the airbox, facing forward, then yes, that's still there. There was a lot of oil on the last oil filter, haven't checked the Pipercross one I fitted recently yet (it was fitted after the smoking began). The milky oil was straight after I fitted the CNC clutch cover and curvy crankcase cover. Again, the smoking started before this swap.

14-05-12, 11:09 AM	#10
Nobbylad Member Mega Poster Join Date: Jun 2008 Location: West Lancs Posts: 4,055	Re: Smoking Sorry yes, air filter. It was definitely oily, but from memory, was in the centre of the air filter as opposed to one side. YC may remember better than me, he's young lol