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Help SRX250 Fuel line diameters?

Discussion in 'Yamaha 250cc Singles' started by Nate R, Apr 5, 2022.

  1. Nate R

    Nate R Active Member

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    Hi all! Relatively new here. Appreciate having the resources here...been very helpful! Recently picked up an 87 SRX250 with 3800 miles, we are the 3rd owner. Fantastic cosmetic shape, needs a little TLC. This is the 2nd SRX250 we've owned.. Should've never sold the first one!

    Been working on getting this one "good to go" for my wife to ride. Freed up the sticky throttle and clutch cables, new clutch lever, rebuilt the front brake caliper, and ordered new tires to replace the 35 year old originals! Put TT350 boots on, cleaned the carb, replaced the choke, Reinstalled the airbox the PO had removed. Found the NEW petcock the PO installed a year or 2 ago is already not holding shut....I assume it's got debris in it.

    Anyway, going to convert to a different petcock setup and fuel filter.... but I need fuel lines... Can anyone tell me the diameter Yamaha intended for the tank to petcock lines, and the smaller line from the petcock to the carb?

    Thanks!

    -Nate R
    Milwaukee, WI, USA
     
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  2. 2valve

    2valve Well-Known Member

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    Hi Nate
    I went and measured my spare fuel line's to make sure of the I.D's. This is what i fitted as below , nice and snug fit and no chance of falling off. I still fitted the spring clamp's though for safety sake. This was the best I.D hose's that i could find at the time.
    For the fuel tank to the tap is 8mm I.D
    For the fuel tap to the carby is 6mm I.D

    I tried the Tygon branded fuel hose's , but the hose's turned like jelly after a while on the bike and easily rolled or kinked over.

    Iv'e tried fitting to fit high pressure fuel line as that was only thing available in my country town , but it kinked as i started to route the fuel line per O.E , plus the protective spring didn't fit over the fuel line as the O.D was to thick.

    Pretty sure you mentioned that the protective spring for the fuel line's are missing and so are the clamp's ?.

    https://www.yamahapartshouse.com/oemparts/a/yam/50042a28f8700209bc7893ed/fuel-tank.

    Iv'e also fitted new tyre's a fair while back , there very close to O.E sizes , even though the picture's don't show it , especially the rear. They are approx 10mm wider front and rear over the original tyres fitted from the factory , but the height of the tyre is correct , which is great for speedo reading's.

    2.jpg 3.jpg
     
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    Last edited: Apr 7, 2022
  3. Nate R

    Nate R Active Member

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    Thanks for the update, I appreciate it!
    Tygon makes several different hose types...some work better than others.....but I have no plans to use that if not needed, I'll use some low-perm fuel line. Since I'm going down to one, hoping I can route it without kinking.

    Thanks for the link.....interesting....some of the parts that Partzilla shows as not available, like the springs, show updated part #s on the site you sent... Eitiher way, I'll probably not be using an OE fuel line and/or routing for now. But that could change...

    Yeah, I bought some Bridgestone BT-46s...the front will be higher than stock, but I might slide the forks up a bit to compensate...while that won't fix the speedo, I'm OK with it, and happy to have a rear tire that's within a couple mm of stock height.
     
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  4. 2valve

    2valve Well-Known Member

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    No problem , happy to help.

    The Tygon fuel hose that i purchased was a nightmare in the end , after a while with fuel in them , they turned to jelly and so soft. That was a waste of huge money , all went in the bin.

    The link i supplied above list the spring's , but as usual you have to make that the part's are in stock or is available before payment , been caught before and had to fight to get my money back.

    I have some pictures of how the fuel line route's from the tank to the fuel tap if you need them.

    The SRX 250's where pretty popular over this way back in the day's , even the motorbike rider school was using the SRX's at one stage.

    Not up to date with the BT-46's , this is what is supplied over this way when i was snooping for tyre's , but it was a while ago.
    I went with the Pirelli's in the end , as my old mechanic / tuner recommended them and i also got them at a really good price.

    Bridgestone BT45.
    - 100/90/16
    - 110/80/18
    - 110/90/18

    Pirelli Sport Demon
    - 100/90/16
    - 110/90/18

     
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Maybe it wasnt genuine Tygon line .... Ive had Tygon lines on the FZR for years and they are fine
     
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  6. 2valve

    2valve Well-Known Member

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    Very true , it could have been a knock off stuff , but i'll never know.
    Pretty sure i still have the invoice , i'll have a look for it and see what it read's. Nope , i haven't got the invoice , must have thrown it out with the fuel line.
    All i can say that it went super soft after a while with fuel in it , but when first purchased it felt pretty firm as such and a really good fit in the spigot's.
     
  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  8. jmw76

    jmw76 Well-Known Member

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    Tygon is a brand name. Not all Tygon tubing is equal. You need to be specific about what it is made of.
    Some info for reference.
    • Tygon® F-4040-A: translucent, yellow tubing for petroleum products with bio-ethanol content max.10%. Resistant to ageing, ozone and UV radiation.
    • Tygon® LP-1200: flexible tubing for petroleum products with bio-ethanol content up to 100%. Low permeation level of aromatic hydrocarbons.
    • Versilon™SE-200: transparent tubing with internal FE fluoropolymer layer. Resistant to very aggressive chemical products, solvents, methyl ethyl ketone (MEK), etc.
     
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  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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  10. Nate R

    Nate R Active Member

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    Yeah, the BT46s came out in 2020 with limited sizes in the US, at least. Just an updated BT-45. But I went with 46s to make sure that I got fresh-ish rubber.

    I went with 100/90-16 front and 110/80-18 rear. The front should in theory be about 9mm taller, the rear 2mm shorter than stock. I may raise the forks in the clamps a bit to compensate. (PO raised the forks a LOT for his 4'11" wife....but he went too far, and the triple will smash the dust seals under hard braking....so I have to move them anyway)
     
  11. 2valve

    2valve Well-Known Member

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    I have no idea what the company sold me in the end , as i threw out the invoice with the fuel line.
    The reason why i found the fuel line was going soft , i was checking the fuel gauge for accuracy and making sure i had no leak's at the time.
    This is the only decent photo i have of the fuel line i used.


    51Y.jpg
    51Y.jpg
     
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  12. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    What @2valve said (great looking bike). I used to sell that yellow Tygon hose (thinking it should be good), but it goes soft and swells, leading to leaks.
     
    Last edited: Apr 9, 2022
  13. 2valve

    2valve Well-Known Member

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    Thank's for the compliment of the bike , much appreciated :thumb_ups:. It came up better than what i ever thought it was possible.

    Your spot on , the fuel line is rubbish , buyer's beware :aggressive:.
    The fuel line swelled so much that you could actually remove it from the spigot's with ease , even though it was super neat on fitment. And it wasn't cheap either.

    Don't tell anyone , the fairing got dirty a few week's ago , bloody bug's on the highway , not happy :lolsign:.
     
  14. jmw76

    jmw76 Well-Known Member

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    Great looking bike. With the modern file blends, I would stay with materials that are good for additives such as ethanol, tolulene, etc.
     

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