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1993 XV1100 been stood 12 years

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1993 XV1100 been stood 12 years

PostAuthor: Davdog1 » Wed Apr 21, 2021 6:45 am

Hi all
So as it stands the bike starts and runs sweet for around 3 miles. Then it starts smoking from the exhaust (light blue/grey) and loses power. So I stop and the bike smells very hot and oily and there is oil smoke from the front pot exhaust where the downpipe meets the muffler.
So far I have stripped and serviced the carbs including float heights. Replaced all the consumables in the carbs. Not touched the main jets or emulsion tubes.
Had to spend a lot of time clearing the rust from both tanks and replaced fuel filter a few times.
Changed plugs and checked ignition system in general.
Compression test both cylinders around 130 within a pound or two of each other

Any ideas? Could valve seals being perished cause this? I've spent a lot of time on this and it's not playing nice!
TIA
Dav

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Re: 1993 XV1100 been stood 12 years

PostAuthor: Timbox3899 » Wed Apr 21, 2021 8:01 am

Have you already did the valves spec? I would guess in the same line of thinking you are. Seems like when the bike is warming up maybe something in the valve line is warming up and allowing the oil to come through. Valve guides could be the issue.

If there is enough oil to be coming out from around the exhaust to cause smoke and follow out the plug, I think you are heading in the right direction for trouble shooting. Good luck.

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Re: 1993 XV1100 been stood 12 years

PostAuthor: Davdog1 » Wed Apr 21, 2021 9:24 am

Thanks for the reply Timbox
Looks like the motor's getting pulled this weekend :(

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Re: 1993 XV1100 been stood 12 years

PostAuthor: Davdog1 » Tue May 11, 2021 3:55 am

Changed the valve seals and did valve clearances but it's still the same.
The bike starts, runs, idles and performs absolutely fine but still the smoke comes back after a few miles.
Anyone got any clue where to look next?
Desperate Dave :(

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Re: 1993 XV1100 been stood 12 years

PostAuthor: Timbox3899 » Tue May 11, 2021 6:28 am

Well it could be some residual oil? I know if there is no oil at first and then with the bike warms up you get the smoke. You would think with the bike cold, the rings would be smaller and as the bike warms up, they expand. So I would guess it would not be the rings?

Leaking gasket in the head? Once the oil gets to temp it might find its way into the cylinder? Unfortunately I think you will have to pull the heads and or jugs on that one cylinder to see what is going on. I don't know how much it is smoking? Have you done a compression and leak down test?

Good luck, that one is a head scratchier.

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Re: 1993 XV1100 been stood 12 years

PostAuthor: Davdog1 » Tue May 11, 2021 8:13 am

Timbox3899 wrote:Well it could be some residual oil? I know if there is no oil at first and then with the bike warms up you get the smoke. You would think with the bike cold, the rings would be smaller and as the bike warms up, they expand. So I would guess it would not be the rings?

Leaking gasket in the head? Once the oil gets to temp it might find its way into the cylinder? Unfortunately I think you will have to pull the heads and or jugs on that one cylinder to see what is going on. I don't know how much it is smoking? Have you done a compression and leak down test?

Good luck, that one is a head scratchier.


Thanks for the reply. Compression on both pots comes out ok within tolerance and within a psi or two of each other. I haven't done a leakdown test.
As I say it's done very few miles and has been dry stored so could an electrical/ignition breakdown cause this sort of effect? I'm clutching at straws as you can tell!

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Re: 1993 XV1100 been stood 12 years

PostAuthor: Jake » Tue May 11, 2021 8:55 am

The oil smoke may be coming from the oil filter cover, is the small o-ring on the bottom screw missing ?

Did you remove the needle seat and clean the fine screen under the needle seat ?
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Re: 1993 XV1100 been stood 12 years

PostAuthor: Flyingdog » Tue May 11, 2021 9:06 am

:yup:
Spitball'n here, but how much oil is in the sump? Might also want to check fuel level (via: clear tube method). Could be one or a combo of the two leading to the smoke. What do your plugs look like. Meaning: fluffy/black usually indicate excessive fuel (grey smoke)...wet/shiny black= an oil control problem (blue smoke).
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Re: 1993 XV1100 been stood 12 years

PostAuthor: Davdog1 » Thu May 13, 2021 4:05 am

Jake wrote:The oil smoke may be coming from the oil filter cover, is the small o-ring on the bottom screw missing ?

Did you remove the needle seat and clean the fine screen under the needle seat ?


Thanks for that mate. The o-ring was missing but no oil coming from there.
Believe it or not I went out last night and just ran it for 10 or so miles and it was fine. A bit of smoke to start with but then cleared up and behaved fine. I think it may have "settled down" after the valve seal swap. Fingers crossed it's a fix :)

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Re: 1993 XV1100 been stood 12 years

PostAuthor: Timbox3899 » Thu May 13, 2021 6:07 am

Good, the break-in time is what it needed. Either way seems that you are happy with it and that is what matters. Enjoy the ride.

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