Carb rebuild

[FJmonkey]

My first [street] bike was a Yamaha Maxim -almost certainly nearly the same bike as your Seca -lovely bike that was.

Dan

Really? Was it a Maxim 400? That was my first bike... Boy did it need work for it to run... Good learning there....

[Dan Filetti]

Really? Was it a Maxim 400? That was my first bike... Boy did it need work for it to run... Good learning there....

Mine was the 550, (1982 vintage) but it was nearly the same bike as the 400 though.  By comparison, mine did need work, (which it never really got) but it still ran like stink nonetheless.

Looked like this:



Dan

[Capn Ron]

Mine was the 550, (1982 vintage) but it was nearly the same bike as the 400 though.  By comparison, mine did need work, (which it never really got) but it still ran like stink nonetheless.

Looked like this:



Dan

Yep, same engine they used in my '82 Seca 550.  Dead-simple and got me hooked on the Yamaha in-line fours.  I have a lot of great memories on that bike!

Cap'n Ron. . .

[ribbert]

Dazza, I don't trust my carbs. They perform flawlessly for 20,000km then have a fuel dumping episode, it might repeat itself an hour later, a day or a year. They might do it repeatedly for a couple of days and then not for the next two years.

It's not always the same one, I have the fuel pump model with good filtration, It runs on Aussie fuel, my tank is pristine, I regularly rinse it out, the carbs had never been fiddled with by the p o. They have been done once by me and the pattern is the same now as it always has been.

I carry one of these in each of my bike bags (so I always have one with me) to give the offending carby a few quick raps on the bowl and it stops immediately. It's a 300x10mm length of rod. Must be steel with a bit of weight to be effective. Screw driver handles won't do it.
Numbering the vent pipes (which I haven't done) makes it easy to identify which one is the culprit.



Yes, I know they shouldn't do it and yours probably won't but it's easy to carry and beats the hell out of pulling the carbs on the side of the road, particularly in your neck of the woods.

Noel

[Dazza57]

Neil, the bike for the Bathurst run was a 80 GS1000G Suzi shaft drive. She was a nice ride, could do 1500km days one after the other, very comfy.

Further to the carb saga, pulled the petock out of the tank, filter clean as. Checked the suppressors were tight in the plug leads. Took her for a spin with the fuel tank cap open, still the same problem.
I've taken the carbs off again, checked all the fuel lines were clear, all OK.
Today I'm going to take the bowls off and check the floats are all moving OK and try to set the levels with a clear tube. Not sure how I'll get fuel to them for that bit yet, still thinking about it.
I have bought some more fuel line, and after putting everything back today and testing again, if the problem is still there I'll try the direct fuel line bypassing the pump and see if that cures it.
The other thing I need to check today is whether the non-return valve for the fuel line is working, I have a funny feeling that it might not be, although at least she hasn't filled the sump with fuel.

Anyway, I'll let you know how I go tonight.

Cheers

[RichBaker]

The other thing I need to check today is whether the non-return valve for the fuel line is working, I have a funny feeling that it might not be, although at least she hasn't filled the sump with fuel.

Anyway, I'll let you know how I go tonight.

Cheers

The WHAT???

[racerrad8]

The WHAT???

C'mon Rich...





















































That is what works in conjunction with the high-speed slobber valve.

Randy - RPM

[movenon]

 non-return valve ?? . 
If you bypass the fuel pump then also bypass the fuel filter for a test. The filter is to restrictive for gravity feed.
George

[ribbert]

The other thing I need to check today is whether the non-return valve for the fuel line is working

Cheers

I imagine you are referring to the "valve'' that stops the fuel flow when it's turned off?
That is the fuel pump's job.

Noel

[Dazza57]

Well, I feel like a total knob head
I took off all the float bowls to check I had set the float levels correctly. All seemed OK until I opened up carb #3. Hello, bit of brass lying there, the main jet had broken off.

I thought I had been very careful not to over tighten the brass fittings, but evidently not  Managed to get the bit of thread out , then used some air to make sure there were no bits left in there. Replaced the jet with one of the old ones, put everything back together, and hey presto 
Took her for a quick run and she's running, but still needs the carb synch
This morning did the carb synch and adjusted the idle mixture and took her for another run, awesome 
Very happy with the results after being very concerned that I wouldn't be able to make my bike holiday in November.

So after all this Effy got a birthday wash, and after the MotoGP, she'll get a polish ready to remount the gearsack rack for the trip.

Thanks again everyone for all the help and patience with me, and Randy, I had to laugh at your quip "That is what works in conjunction with the high-speed slobber valve." Haha. My misuse of some names has to be laughable, but I made it after all thanks to the great people and experience on this site

Cheers, Dazza

[racerrad8]

...and Randy, I had to laugh at your quip "That is what works in conjunction with the high-speed slobber valve." Haha. My misuse of some names has to be laughable, but I made it after all thanks to the great people and experience on this site

Cheers, Dazza

Glad you found it and I am glad I was able to enlighten your day just a little.

Enjoy the ride.

Randy - RPM