Date: 25-10-25  Time: 14:29 pm

Author Topic: '98 tank overflow hoses routing - HELP  (Read 1505 times)

Frasier

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'98 tank overflow hoses routing - HELP
« on: 18 July 2022, 03:01:40 pm »
Hello All,
I forgot to take photos while disassembled the bike, now I don't know where went the two rubber hoses, which comes from the fuel tank. I know theres a black rubber funnel on the later bikes, but mines is the old one, with two longish, separate hoses plugged into the bottom of the tank, and they go towards the ground...somewhere. So, anybody has some photos, or can explain it, where to route these, please? Left, right, between the carbs, or? Also, I'm not sure about the two overflow hoses of the carbs, too... these are too short, to reach below the swingarm.... any ideas?
Thank you in advance!


BBROWN1664

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Re: '98 tank overflow hoses routing - HELP
« Reply #1 on: 18 July 2022, 04:58:34 pm »
From the tank down between two carbs (the gap closest which from memory i think is between 3&4) then straight down the shortest route to below the bike.

Frasier

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Re: '98 tank overflow hoses routing - HELP
« Reply #2 on: 18 July 2022, 05:04:12 pm »
So they aren't clipped to any metal clips on the engine? Just go straight to the engines back? I think they are connected at approximately the center line on the tank, that means they should go down first between carb #2 and #3 then. Thank you, I will check it soon.

BBROWN1664

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Re: '98 tank overflow hoses routing - HELP
« Reply #3 on: 18 July 2022, 08:27:36 pm »
Not clipped to teh frame or the engine. As you lift the tank they normally pull upwards meaning you have to pull them down when you lower the tank to stop them kinking.
Probably is 2&3 - doing it from memory

Frasier

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Re: '98 tank overflow hoses routing - HELP
« Reply #4 on: 18 July 2022, 08:55:08 pm »
Oh, I see what you mean. Seems logical now. Thank you.

unfazed

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Re: '98 tank overflow hoses routing - HELP
« Reply #5 on: 18 July 2022, 11:17:05 pm »
Down the outside of carb 4 inside the TPS cable and down the back of the engine inside where the clutch cover is attached to the Crankcase and through the loop at the bottom with the coolant reservoir overflow hose

Frasier

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Re: '98 tank overflow hoses routing - HELP
« Reply #6 on: 19 July 2022, 08:17:35 am »
I will check that too. thank you. To be honest I watched several Youtube videos, but wasn't able to figure out the original routing. Additional problem is the age of these bikes, all of them had services through the years, and not everybody puts back everything where it was before.

BBROWN1664

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Re: '98 tank overflow hoses routing - HELP
« Reply #7 on: 19 July 2022, 09:52:52 am »
Page 2-28 of the yamaha manual shows if does not go on the outside of the TPS.

https://foc-u.co.uk/index.php?action=downloads;sa=downfile&id=8

Frasier

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Re: '98 tank overflow hoses routing - HELP
« Reply #8 on: 19 July 2022, 10:23:08 am »
It's funny, I have this service manual open on the workshop laptop all the time, but somehow missed the cable routing section... :rolleyes 20 years ago I didn't need any manual to assemble a bike (or car) from memory, but nowadays I have to take photos of everything...

Frasier

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Re: '98 tank overflow hoses routing - HELP
« Reply #9 on: 21 July 2022, 02:03:16 pm »
Closing this topic: routed the two owerflow hoses of the tank according to service manual, and now I see why Mr. Yamaha changed this solution to a rubber funnel on later models. The hoses are not long enough to reach their destination, if I want leave some lenght at the tank, to help lifting it. It means I have to unclip the hoses and pull back and free tem, BEFORE trying to lift the tank. Strange, but that's how it is.Anyhow, thanks again, both of you.

BBROWN1664

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Re: '98 tank overflow hoses routing - HELP
« Reply #10 on: 21 July 2022, 04:22:06 pm »
if I want leave some lenght at the tank, to help lifting it.

If you do this, they kink under the tank and cause a vacuum in the tank preventing fuel from being pumped to the carbs. You need to pull them down as you lower the tank to prevent this.