Missing pins in carb

[forexbob]

Tried to find what this is and what it's for and if this is an issue, but as I don't know what it's called, it's tough to search for.

Carbs 1 & 2 have a little "needle" but 3 & 4 do not.

Carb 2


Bigger

Carb 4



So what is this thing? What is it used for? Is it a problem that 2 of the carbs are missing them? Is it fixable? How many golf balls are on the moon? Sooo many questions!

Thanks again,
Bob

[crazy steve]

That's your idle adjustment screw; it looks like it's turned in all the way. You can't see the others because they're not turned in as far.

Why those are in that far is hard to say...

[forexbob]

Thanks Steve,

So unscrewing them all the way is no big deal then? I'd just as soon have them out of the way so I don't break them.

Bob

[WMarshy]

Should probably have them all some what close to eachother. I would count how many turns in #3 + 4 are from lightly seated and write them all down (might need it later but not likely), then back them all off that same amount to start with (I think 2~2.5 turns out is a good place to start from). When you do have them all cleaned and ready to run start the bike and see what happens!

Lots of reference material on this site about where to start with on mixture screws...

[DGXSER]

CAUTION!!! On those early model carbs do not turn that screw more than LIGHTLY seated. IT has a tendency to get stuck in the hole and snap off, and its a bugger and a half to get that broken tip out.

[planedick]

Pins

Looks like the tips are already broken off and stuck in the holes. They should never be sticking out that far anyway.

[forexbob]

How hooped am I?

So now that I've turned the carbs over I notice that carb one, that has the needle projecting out from the surface actually has NO idle screw. There doesn't appear to be anything broken off in the hole.

I assume that if there is no idle screw that the needle shouldn't be visible. And as it is, is it therefore stuck and what might I be able to do about it?

I need another bike. I don't think I'll be riding this one any time soon

Thanks
Bob

[planedick]

Easy

Just push the pin back up and out then get another idle screw...

[forexbob]

Better and better

So 3 and 4 don't even have the needles. I screwed the idle screws in all the way and nothing. The other two I've tried pushing back in but they don't move. Now, I haven't gotten a bigger hammer yet 'cause they seem a little fragile.

Can I get replacement needles?

Thanks
Bob

[DGXSER]

Yep, those screws can be had no problem. It is an interesting task to get the broken ones out. Alot of methods have been tried. Lately a member had a machinist buddy that made a really slick tool to do the job. Kind of a press made out of nuts and bolts and a small drill bit.

But there are other methods.

[natemoen]

Yes you van get.carb kits and they include the idle screws.

Recently someone used a small bolt with an acorn nut on the end and put it inside the carb and inscrewed the nut inside to pop the broken needle out from inside. Seems like the easiest and safest way of doing it.

[Ken Talbot]

For the ones that are already broken off, you can re-machine the ends by chucking the screw in a drill press and reshaping the end by holding a fine file and sandpaper against it. Use a good screw to give you a guide for what it needs to look like. OTOH, for the few bucks it costs, buying new replacements is a more sure fix. I did the re-machining fix for another owner when he drove 5 hours to get to my place on a weekend and we REALLY wanted to send him home with things working properly.

[forexbob]

As I'm missing one of the screws, I'll just get new ones all around. Problem is I can't find a part number. What is the actual name of this little thingy - Pilot Screw? And if so Bike Bandit wants $22 each? Is this correct? Ouch

Thanks
Bob

[crazy steve]

As I'm missing one of the screws, I'll just get new ones all around. Problem is I can't find a part number. What is the actual name of this little thingy - Pilot Screw? And if so Bike Bandit wants $22 each? Is this correct? Ouch

Buy the carb rebuild kits from Georgefix; these come with all the parts you need. Buying these singly will break the bank...

You can get the kits here:http://cgi.ebay.com/ebaymotors/4-YAM...item53e6ee34d4

[DGXSER]

If all you need are the mixture screws (aka...pilot mixture screw aka....pilot air screw, I just call it the mixture screw) you can messgae Goerge and ask about buying just the screws. He sells the components individually. But steve may well be correct on economics of it. Can't hurt to ask.