Tune up - read the plugs

[iridewheelies]

  I replaced the fuel line when I bought the bike and A. Never really thought of getting the correct metric fuel line, just went with what I had lying around the shop. B. With the tank back off I am seeing some weeping around my aftermarket POS petcock. The seller stated that it flows more blah blah but I should have known just by looking at it. Pulled out my box of old parts, and the vacuum petcock is definitely a lot larger. I think I'm going to put it back to how it was. Along with correct fuel line, and maybe even fix my fuel gauge. Lol. Also, isnt there suppose to be o rings here??? Where the cerrrbs go into the manifolds. Lmfaoo

[iridewheelies]

She has seen her share of abuse, and I have some dirty ways

[iridewheelies]

I wonder if the odometer rolled over... it reads 12k lol on the bright side I pulled the carbs apart I hope the bowl gaskets are reusable they are in decent shape not very old. Glad I cleaned them though, I actually put some bad gas through it (87) no ethanol though, I was in a pinch. The jets were definitely pretty dirty, all the pilots showed noticable change of light thru them just by blowing (oh yah) them. Emulsion tubes (or whatever) dont look to be worn out. Looks to be a few simple nick nack fixes and a can of cerb clean. Ps. Look at the abuse....

[RPM - Robert]

No there are no o-rings there. The o-rings on the intake manifolds are on the back side and seal against the head. The groove on the carb body mates with the intake manifold. Stick your finger in there and feel the ridge.

[ZOA NOM]

Please address all of the fuel lines with the proper Yamaha parts...

http://www.fjowners.com/index.php?topic=17320.0

[ribbert]

Rick, I understand the sentiment here but "OEM Spares' is not where you get fuel line from.

It needs to be fresh, buy it from a store with turnover, not something that could have been sitting in a bag for 20 years and pay 4 times the price for it as well. There's also a chance the new hose may be better. I buy fuel line 10m at a time, it lasts me a couple of years these days and I reckon that's long enough.
I've had "new/stale" fuel line split as I've pushed it on, cut a new end, split again and so on. It is why I don't like having too much hanging around.

Use proper fuel hose clamps, not worm drives.


Fuel line, like most other peripheral components, is not made by Yamaha anyway.

Noel

[iridewheelies]

Update. Carbs still apart. Emulsion tubes dirty. Cleaning up. Here's a pic, tubes on carbs 1, 2 look newer than 3,4! Odd! They dont look ovaled out... everyone learns someday! Lol

[iridewheelies]

Gonna clean them with some thin wire

[iridewheelies]

Can I measure float levels like this? I am measuring to the tallest curved part of float, with no gasket. The needles are shut, with the needles just barley resting on the float. There was around 2mm between them beforehand, roughly measured 25.6mm on each level give or take. Reset to 21.78 +- .3

[iridewheelies]

Think i got it.

[FJ_Hooligan]

Update. Carbs still apart. Emulsion tubes dirty. Cleaning up. Here's a pic, tubes on carbs 1, 2 look newer than 3,4! Odd! They dont look ovaled out... everyone learns someday! Lol

If the emulsion tubes are oval shaped then they are worn out and need to be replaced.  

When they get oval, the needle is not as effective at controlling fuel flow and the mixture will tend to get richer.  That's why plugs 3 and 4 look richer.  You could try dropping the needle slightly to compensate but it would just be a guess.  

New tubes is the correct answer.

Also, on the float level I'd shoot more for 23 to 24mm.

[iridewheelies]

If the emulsion tubes are oval shaped then they are worn out and need to be replaced.  

When they get oval, the needle is not as effective at controlling fuel flow and the mixture will tend to get richer.  That's why plugs 3 and 4 look richer.  You could try dropping the needle slightly to compensate but it would just be a guess.  

New tubes is the correct answer.

Also, on the float level I'd shoot more for 23 to 24mm.
[/quote]

They did clean up well. I don't believe that they are worn out quite yet. Will pull them back out today and get a good inspection in the sunlight. It maybe a little difficult to spot the ovaling at first, but I spent around 10 minutes with a high powered light, shining through different angles to be sure they arent worn. Will set them to 23mm as well

[FJ_Hooligan]

They did clean up well. I don't believe that they are worn out quite yet. Will pull them back out today and get a good inspection in the sunlight. It maybe a little difficult to spot the ovaling at first, but I spent around 10 minutes with a high powered light, shining through different angles to be sure they arent worn. Will set them to 23mm as well

Better yet, swap the 3 and 4 tubes into the 1 and 2 carbs and see of the dark plugs follow them.

[ZOA NOM]

Rick, I understand the sentiment here but "OEM Spares' is not where you get fuel line from.

It needs to be fresh, buy it from a store with turnover, not something that could have been sitting in a bag for 20 years and pay 4 times the price for it as well. There's also a chance the new hose may be better. I buy fuel line 10m at a time, it lasts me a couple of years these days and I reckon that's long enough.
I've had "new/stale" fuel line split as I've pushed it on, cut a new end, split again and so on. It is why I don't like having too much hanging around.

Use proper fuel hose clamps, not worm drives.


Fuel line, like most other peripheral components, is not made by Yamaha anyway.

Noel

Very good advice, Noel. My issue was not the fuel line, I used the term generically. It was a non-Yamaha fuel filter. The nipple was a little too large for the hose, and a split was the result.

[iridewheelies]

No fuel filter on my bike. I very thoroughly cleaned the tank, I filled it with nuts bolts chain saw blade pieces. Got more 3/8 hose from my shop and some safety wire, I replaced the o ring cuz mine popped out without much resistance