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carburetor diaphragm hose to frame question?

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carburetor diaphragm hose to frame question?

PostAuthor: Crazy_Russian » Tue Jun 11, 2019 3:30 am

so considering the stock hoses that run between the carburetor diaphragm and the funky tubes on the frame are dead, what do we do for replacement? source? part numbers? anything?
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Re: carburetor diaphragm hose to frame question?

PostAuthor: Flyingdog » Tue Jun 11, 2019 4:20 am

Which bike..guess it really doesn't matter as the 750/920 is same set up.
Here the oem numbers--> https://www.yamahapartshouse.com/oempar ... air-filter

They don't make them anymore, but maybe get lucky on Ebay/salvage yard/items wanted in VTF?
Maybe you can find some like sized vacuum hose and the 90°barbed fittings for the angles. You probly should use the black bulb things as they're air filters, but suppose you could leave them out, if you don't have them. They're piped into the air cleaner box, so not sure how much, if any, oil bypass would get back to carbs. Maybe none..never considered that one.
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Re: carburetor diaphragm hose to frame question?

PostAuthor: bstig60 » Tue Jun 11, 2019 9:34 am

Others have used cone filters or other filter types using the intake elbows to bring them out the sides.
Bill
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Re: carburetor diaphragm hose to frame question?

PostAuthor: Crazy_Russian » Wed Jun 12, 2019 3:44 am

i guess it's time to do some digging around the garage.... no idea where i've placed the old lines
i was just hoping that someone found a set of 90 degree silicone hoses that could be used... or something like that
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Re: carburetor diaphragm hose to frame question?

PostAuthor: Flyingdog » Wed Jun 12, 2019 3:49 am

Dream On :bg: Thinking you "might" know where something is.

Maybe you could take some nylon or some kind of hose and make the bends with a heat gun.
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Re: carburetor diaphragm hose to frame question?

PostAuthor: Crazy_Russian » Wed Jun 12, 2019 10:27 pm

ill be the first to admit, i have not a slightest clue where i placed them..... :blush: :doh:
nylon melts around 205 c... not an option unfortunetly.
time to start digging though the garage... FML
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91 Dnepr MT11-32 (Stolen)
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Re: carburetor diaphragm hose to frame question?

PostAuthor: Flyingdog » Thu Jun 13, 2019 3:42 am

Crazy_Russian wrote:nylon melts around 205 c... not an option unfortunetly.


Guess I used the word "nylon" in a generic way. Kinda meant harder than rubber, but softer than pvc/plastic.
Heh..if that area gets above 400°, think there are bigger problems than finding a misplace part. :bg:


Physical Properties of Nylon
Heat Distortion 375° F

Physical Properties of Polypropylene
Heat Distortion 285° F

Those filter bulb things are made of poly (or more accurately: Bakelite/synthetic plastic).

Next time I go for a decent ride..or even cross town..I take some temps. IIRC, did that just for giggles long, long ago.....
Don't think the head temps got above 190°, exhaust port: close too 300°and side cover: maybe 80°. I'll check for sure sometime..even (just for you) that air space between the cylinders, heads and frame. :bg: :cl:

OK..got around to it:
85°Day. 70 mile ride / 1/2 open road..1/2 city
Heads(spark plug side):#1: 199° #2: 180°
Between cylinders: 130° (below the carbs..couldn't get to above)

Not the most sophisticated IR temp gun and take'n idle'n
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