I've read the thread... it's a great one. But the more I think about it, it would make more sense FOR ME to find a low mileage engine and go that route... IF it does need internal work.
New to me 91 ST1100 blowing blue smoke
- Thread starter bonth123
- Start date
Smoker, I think you've had a light bulb moment!
This was only fitted for a short while, Why?
I stand to be corrected but If the bike ran ok for 14 miles then started to push oil out it's not coming past the rings/pistons.
Fit the oil breather and see where you go. You've got to do this first or how do you even start to diagnose other issues.
Although I think what you've done so far makes good sense bearing in mind its lack of recent use.
FWIW.
Upt'North.
This was only fitted for a short while, Why?
I stand to be corrected but If the bike ran ok for 14 miles then started to push oil out it's not coming past the rings/pistons.
Fit the oil breather and see where you go. You've got to do this first or how do you even start to diagnose other issues.
Although I think what you've done so far makes good sense bearing in mind its lack of recent use.
FWIW.
Upt'North.
So I called the dealer... he has no idea what I'm talking about. He said he saw one part on the fiche that looks like what I'm describing, but it only has two ports, not three... and it doesn't have a part number.
Anyone here have the part number, or an idea of where to find it??!
Anyone here have the part number, or an idea of where to find it??!
- Joined
- Oct 17, 2015
- Messages
- 1,960
- Location
- near Harrow, Ontario, Canada
- Bike
- '83 BMW R100RS
- STOC #
- 8870
Agreed - I think that Upt’north has put his finger on it - if the rings were bad, it would not have run clean for 14 miles.
Whooshka
Fairly faST old guy
I third that. Bad rings will smoke the second you start the bike.
If oil was coming up past the rings, you are both correct. But I'm 99% sure that's not the case. If combustion is getting past the rings, pressurizing the crankcase, pushing oil up the breather hose, into the air box, through the filter, down into the carbs... totally different story. That's what I believe is happening. And it wasn't good for 14 miles, just till it got warm. By 14 miles I had lost nearly a quart of oil. A quart in 14 miles!!!
- Joined
- Oct 17, 2015
- Messages
- 1,960
- Location
- near Harrow, Ontario, Canada
- Bike
- '83 BMW R100RS
- STOC #
- 8870
I’d suggest going to the dealership and staring at the parts fiche (the little screen thingy) it will have the part numbers written on the exploded view shown on the screen.
The other way would be visit www.discounthondaparts.com and enter the year and model of your bike. All of the exploded views with parts numbers should be there - then simply cut and paste that part number into your Google search window.
It is nothing short of amazing what is for sale out there on the web.
John OoSTerhuis
Life Is Good!
It’s on the Fuel Tank fiche:
https://www.ronayers.com/oemparts/a/hon/50540f6df870021c54bedbd1/fuel-tank
Item 18:
TANK, BREATHER
17551-MT3-000
You’re welcome, and good luck!
Edit: just dug up this old thread, ha!: https://www.st-owners.com/forums/showthread.php?112323
There’s a salvage yard or individual somewhere parting out a ‘91...
BeST, John
Last edited:
John OoSTerhuis
Life Is Good!
Cycle Parts seems to have one in stock for $31, at least it shows up when I add it to the shopping cart...
http://www.cycle-parts.com/Product.aspx?ProductID=932566&SKU=17551-MT3-000
http://www.cycle-parts.com/Product.aspx?ProductID=932566&SKU=17551-MT3-000
Thank you, John! Ordered and on the way.
[emoji22]
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Aha!
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The smoking gun!
That'll do it. That's the hose that's supposed to do the breathing. Figures why the bottom one was puking.
Yep! I can't believe I didn't see it before...
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John OoSTerhuis
Life Is Good!
You still need to install the correct part for your classic ‘91. Those eBay part are cheap!
I’d like to know the backstory on why it is missing...
John
I’d like to know the backstory on why it is missing...
John
I did buy one, but I didn't think to get the hoses. How do the non-91 st1100's vent the crankcase? Remember, mine is actually a 92, but I guess the fact that I even have the ports at all suggests that it would've had the tank originally...
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Not owning an 1100 I'm curious... That kinked hose... Is the missing tank part of that connection? Or is there a contoured bit that goes in there to avoid that kink?
that's a good question, I have a guess, but I'm not sure. There's a hose that runs from the water pump housing up to the airbox, that's called a "breather hose". Since I don't think the water pump itself needs to breathe, and that hose connection is outside the water pump O-ring area, I'm guessing that hose might be used to vent the crankcase up to the airbox.