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**fusionking** · 07-06-2003, 06:02 PM

A VERY CRAPPY story!

Man strom that sucks! Hope your testing reveals something that is fairly cheap, but it don't sound good. Sorry to hear about it. You've certainly poured lots of genuine thought and effort into this project and this site for that matter. Don't let it get you too far down. Make sure you drain all the gas out of everything as soon as possible. I'm sure you already thot of that tho. Go big bore man! Do the head justice while you're there too! Do you read the other XS forums over there? Funny, over here sometimes bikes are cheaper than parts! So over here changin' the motor would be a good option(SOMETIMES).

**nashville_bill** · 07-07-2003, 06:19 AM

Since you are so knowlegable I almost hate to offer this, but are you sure the smoke is oil and not gas? I had problems with flooding when I first aquired my XS and the flooding didn't always start at the first part of my ride.

**Redbaron** · 07-07-2003, 07:03 AM

Shot in the dark

I had a similar issue related to carbs flooding due to oversize main jets. Too much Fuel, was washing oil into the cylinder and causing oil consumption. Re-installed 42.5 jets and problem seems to have disappeared. Not sure this is completely gone, but three weeks later and still no added oil. HTH
Kinda going for the something overlooked avenue.

**schpiff** · 07-07-2003, 08:23 AM

Just a shot in the dark here but is it possible the crankcase breather is plugged? That would make for some smoking and erratic running and maybe (this is a long shot).. the pressure managed to blow out your valve cover gasket?

**strom** · 07-07-2003, 09:25 AM

Well, I'll check the breather tube... that might be an option.
I have all stock jets installed. I guess I need a few days to cool off.
Thanks for the hints tho...

LP

**TopCatGr58** · 07-07-2003, 09:10 PM

Hey there Strom,

On the cheaper side, AFTER you do a compression test to make sure you haven't broken an oil ring, if it measures okay, then, I would say that the valvle seal is most likely culprit. You'll have to pull the head to replace them anyways, cause you have to break down the valves to get the springs out to replace the seals, but they were on a 20+year old machine. When I did my big bore, I replaced mine even thought there wasn't any sign of leak, just because it had been sitting so long, and after doing a rebuild, I didn't want to have to tear into it again if/when the valve seals were to go. They were $8.00 each a couple of years ago from Yamaha. You'll need 8!! The head is flooded with oil when it runs, and if the valve seal is badly worn, it'll just drip right down the valve and into the engine!!

Good luck!!! T.C.

**Ken Talbot** · 07-08-2003, 12:37 PM

I've only seen this once - when I first took delivery of Tsunami. Turns out the PO had never got to know the bike, and didn't know how to check the oil level in the sight glass on the right side of the engine. Instead, he had filled it to the bottom of the oil filler hole, sort of like you do with a lawnmotor engine. With that much oil in the crankcase, it got pumped up the vent hose into the airbox, dripped out of the airbox breather all over the top of the crankcase, then rolled off of of therre onto the hot exhaust pipe. Man, what a scene that caused. I thought one guy folowing me was going to drive into the ditch when I went around a slight curve after a stoplight!

I know this is probalby not your situation, but thought I'd thow it in for a bit of humour. I'm guessing your problem is a bad valve cover gasket which is leaking into the cavity around sparkplug #4, then the oil is running out the drain hole to the front towards exhaust pipe #4.

**strom** · 07-08-2003, 03:31 PM

Will check, but the smoke that comes out of the exhaust might proove that the valve cover is sealing properly.

These are just not my lucky days. Yesterday my 17" monitor died. Had to get me a new one... 19" offcourse. At least I had some money put away for registration and stuff. Well, not anymore.

LP

**Ken Talbot** · 07-08-2003, 06:47 PM

Hmm. If the valve cover is okay, and the smoke is coming out of the end of the exhaust, I can't see how it would make it back upwind to collect all over the right side of the head??

**fusionking** · 07-08-2003, 09:12 PM

Everybody's got one

I say quit beating yourself up and run compression !!!!!!!!!! Smoke like you're talkin' would be a major thing. Oil rings don't just break they have to be put together improperly etc. For an intake guide to do that would be wierd cause as it increases clearance it is passing oil and lubing itself. they go bad from running out of oil or overheating. if you had oil dumping all over the top of the motor bad enuff to short out your plug wire it would be wet black. You knew how low on oil it was so it wasn't overfull. I just don't think it simply ground itself apart in that short of time. It would be hard to explain the smoke out the tailpipe tho. I don't think it is easy to get that type of blowby without something BIG like a piston burned up or busted. If it's rings I'd say you got all three bad on that piston. Was that you we was talking about using valve cover gaskets over again with silicone? Man that would sure be cool if it was only some kinda crap like that. You outa do something really out there like throw another plug in it and fire it up anyway but clean the motor first. If it runs good you know it can't be too bad. then watch for that nasty oil leak. I'd think to lose oil out the exhaust gasket it woulda been really loud sounding tho. Just some of the things I would try without anybody buggin' me or having to depend on borrowing tools and having to listen to opinions like you are doing now HAHA

**schpiff** · 07-08-2003, 11:01 PM

ANYTHING WORTH DOING IS WORTH DOING RIGHT

Take yer time, let it sit...do some thinkin...have a beer..or several.
if the oil is on the outside its a minor thing ie..gaskets or wht not..if its coming out the exhaust thats a different deal altogether...a little smoke aint a "big deal" but fogging the neighborhood is ...um..well...yukky

DAMMIT>>THE GLASS IS HALF FULL! (as always

)

**strom** · 07-09-2003, 02:47 PM

All gaskets are OK... except the 4th exhaust one...

LP

**strom** · 07-23-2003, 07:09 PM

Measured the #4 compression... with a leaky tester, and even though it leaked, I got it up to 8:1. If it sealed properly it'd be around 9,5-10,5. So I guess that the valve seals are gone. I checked the service manual... just valve guides mentioned in there. I checked the microfiche and there seems to be a o-ring beneath the valve guide... hmm... no valve seals?!

LP

**Ken Talbot** · 07-23-2003, 07:49 PM

Yes, there is an o-ring between the valve guide and the head. It is part number 6 on this fiche page:

There is also a valve stem seal. It is part number 8 on this fiche page:

Valve stem seals will not have any effect on the cylinder compression. Low compression is a result of a problem with the rings or with the valves and valve seats.

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