Just some help with float hieght

OK so I noticed that with my carbs off bowls off and upside down that my floats are falling down past the top of the enrichment tube is this to far? Also I am running rich. I only got one screw out my bowl the other three are buggered in something fierce. should i tube test with the one bowl? thanks ya'll

 

stankinjankins:

When inverted the bottom of the floats will be lower than the bottom of the pilot tube.

Lucky for you I put new float valves in mine today. Measured from the bottom of the floats to the rim of the carb body to get them close with the new needles and seats. There is some variation, but they are all near 9/16 of an inch.

You could move one bowl around to check the levels, awful lot of work (seems a shame to pull the bowl off the one you just got spot on). Also hard on the gaskets. While you've got it apart I'd recommend getting the stuck screws out and some replacements in.

 

Micarl im getting real discouraged with my bike and I've tried everything save drilling them out to get the screws out. Also my yamaha dealer has to order everything!! I'll call them today and drill them out but 9\16 of an inch is what I need as a start. Thanks so much for being patient with me. Thanks Micarl

 

Well looks like im gonna have to wait a little while for the money to order 3 new plugs at 45 dollars. anyone know a cheaper place to get them?

 

I've got my old ones here somewhere. PM me your address and I'll send them to you.

Not perfect but they should hold the fuel in until you get replacements.

 

Stinky:

This thread might be some help --

http://www.xjbikes.com/Forums/viewtopic ... screw.html

-- it's a complete write-up of drilling out and replacing the drain screws in the Hitachi carbs (including the online source for stainless replacement screws).

Good luck!
Herb

 

thank you all for the help and write ups I'm looking to ride this joker soon. And with all ya'll helping me it will be alot sooner

 

did you try heat, i mean lots of heat
there's nothing in there to melt and a regular burnzomatic won't melt aluminum
pb blaster after it cools off a little, not before it'll just cook out and get like tar
put some in the hole where the gas is going to come out too
wait till its cold
softscrub or dry cleanser on the screwdriver tip
have at it

 

To tell you the truth Polock I don't think the drains have ever been taken out of this thing. I tried heat with a pen torch and an impact tool and a buddy helpon holding it but to no avail. I only got out one. the other three look as if they where screwed in to far. Also I let them soak in PB Blaster for 4 days. PB inside the bowl and in a muffin pan. I hate the Owner before my buddy gave it to me cause it sat around for something like 10 years with no activity what so ever. Needless to say it was in bad shape when i got it. I've sank right around 400 dollars in it so far and I'm still agood ways off from road worthy.

 

You probably are not using enough heat.

BTW, I got my carbs back on and the 9/16 number I gave you put them exactly right.

 

Mighty sweet MiCarl I'll dial in 9\16 and check as soon as i get the plugs. Thanks man.

 

Here's something to think about when using heat:

The material that you are trying to heat needs room to expand. So, if a (big) nut is seized on a bolt, you would want to start heating the nut on the outside, and work your way in. Try applying this to you bowls.

Also, try to keep the heat away from the screw that you are trying to remove. You don't want that screw to expand otherwise you won't be making any headway. If you've had heat on the bowls for a long time, or you have reheated several tiimes, that screw would be pretty hot, and expanded, too. At this point either let everything cool down and start again, or try quenching the screw with a few drops of water/pen lube. The rapid cooling of that screw might just be enought to break the tread lock.

Good luck.

 

Carb bowls are aluminum. Screws are steel. Coefficient of expansion on aluminum is much higher.

When applying the right amount of heat where the threads are in the bowls the bowls should practically spit the screws out.

 

ok i'll try heat again because the actual screw heads on the screws are not messed up thier just siezed in there pretty tough. thanks for the advise yall

 

OK I tried more heat and guess what happened? Yup i broke the two half moon shapes into one have moon shape. Not gonna try heat no more. Just gonna use a drill bit and an easy out now. Also tell me what yall think of this. I've got a friend with a lathe, and i was going to see if I could fabricate one of these plugs. I'll keep ya'll updated I might be able to do it pretty easy and if so i'll try to sell/give to people on the site if i'm successful.