[manotickmike]

Great forum... Been reading the posts to the point that I'm missing sleep!

Can't find much info on the early(?) 1991 carb. I'd like to get a kit before I tear into it. Is there a good source for these?

I had the bottom off in-situ, didn't look as bad as I thought it would, but the bowl gasket didn't go back in as well as it could have, in now weeps a little fuel.

Anyhoo, it won't start. At all. It RUNS fine, just a quick spritz of fuel into the air box, and it fires right up, and runs until you shut it off, but won't re-start, even fully warmed up. Pulling the choke has NO effect.

Any help would be appreciated!

Thanks,

Mike.

 

[assquatch20]

Read the carb cleaning sticky on here. Probably a clogged pilot jet for starters. You'll need that bowl gasket. They all do that sometimes. Try a fresh spark plug before you go to cleaning, just for the sake of properly ruling stuff out.

 

[manotickmike]

IS there a tutorial for the early carb? I can't seem to find it...

Spark is really strong. Bike runs like a top. I'm thinking the choke is not connected to the choke rod.

 

[assquatch20]

Once warm, I don't think you're really gonna need choke, but the rod having an issue is certainly possible, though I've never seen that happen.



Did you check your float height? It would seem you're not getting gas to freeflow in until there's a vacuum, so it could be from the petcock to the float needle that you're having issues.

 

[silverhead]

It could be one of several things causing your problem, but the pilot circuit is most likely gunked up. That said, the enricher (choke) should bypass it and make the bike start. Float height is probably close if you've never taken apart the carb and messed with that.



My pilot jet was completely blocked when I got my bike. It'd run with the choke on but not with it off.



I had to use stiff wire to poke out the bad stuff and clean it with carburetor cleaner.

You need to see daylight through that hole. It's the primary source of fuel to the bike when the throttle is closed at idle.

 

[manotickmike]

Thanks!

So, any recommendations for a carb kit????? I'm leery of the local dealers. I'd be waiting for weeks, and paying through the nose.

Seems most of the Ebay sellers use generic pics, so you really don't know what you're getting.

I'll report back on what I find with the choke doing absolutely nothing.

Don't want to open this thing up while she can still ride it. Not without parts in hand. I'm hoping she can log enough time on it to go trail riding with us in a month or so.

 

[silverhead]

Honestly even at retail price you're best off going to a yamaha dealer. Every carb kit I've seen on ebay is not made with real TK parts (Keyster is crap in EVERY case I have ever purchased.)



I paid about 5 bucks (or less) for pilot jets and main jets at my yamaha dealer last week.



Really, what parts do you need? Make a shopping list of the things you want to replace. I can help you with the OEM part numbers if you want. Most of the OEM stuff is durable and doesn't need to be replaced, rather than just cleaned by hand. The carburetor on these bikes is pretty simple.



The only thing I can see needing to be replaced might be the needle valve and seat if the carb is leaking gas. Otherwise the bowl gasket is rubber and your carb shouldn't leak gas if your float height and your needle valve is working correctly.



Do you have a list of parts you think are failing? The shotgun approach of throwing in half-complete 'carb rebuild kits' almost always sets you back two steps behind where you started. I'm speaking from years of experience. In recent years I have made some REALLY cruddy carbs work like new simply from taking them apart and ultrasonically cleaning them and putting them back together.



The main items I can see as being throw-away and replace are the tiny rubber o-rings that seal the needle valve seat and some other things. Otherwise the factory brass is much nicer than anything from China, Taiwan, or even Japan in the case of some Keyster stuff..

 

[rbm]

Procycle sells a kit for the early carbs.

 

[manotickmike]

Well, I'm now an EXPERT with the early carb. G'head... ask me anything.

Y'know that video of the infantry soldier tearing his rifle down, cleaning and re-assembling endlessly?

That's me with that carb.

It was in pretty bad shape. Now Diane can start the bike (Her first!) without any direction or assistance.

 

[MTLHead]

So what'd you end up having to do? A simple cleaning? And where'd you end up getting parts? Just curious...