1981 XJ650 maxim intake boots YICS

Is this the correct size for the Y10 jet.

 

I can put a small metric rubber washer under jet bring it up 1/32nd

 

I’m too lazy to read read the whole thread. I can’t recall if you did this but I’d pull the carbs and set the fuel level 1mm higher and test again.

 

It seems a little fishy to me that the needles have no markings. Maybe you’re right @glennyboy - maybe they are some incorrect needles causing a problem. That’s the sort of thing that would cause a previous owner to say “jeez, I just rebuilt the carbs and it runs like trash, I guess I’ll just get rid of it”.

 

Fuel levels up to the gaskets trying this first.


My choice is to try this first with rubber washer .. or bring float level up, i did notice that most autos with stromberg carbs have the gas up to the top of emulsion tubes mine has the level lower ? but its up to the bowl gasket.. or get the rebuild kit with jets/emulsion tubes etc

 

That didn't work carbs off for full dismantle

 

The jet was higher by 2mm using washer, i was able to get a better mixture adjustment ...had good mid range but after 5k it had the surge, carbs off, rack apart found nothing wrong, boiled in soapy water, soaking overnight in strong stuff the wife uses in the washing machine lol...church of clean..getting rebuild kit, i dont understand whats going on, the new jet and emulsion tube etc coming ...if that dont fix it its got to be ignition?

 

A quick thought.
Are the air jets in the correct positions? (opposite of what the service manual shows is correct)
Did I ask that already?

 

Yes air jets in right order ..carbs back on the rack all clean, waiting for parts

 

Dam it I think I found the problem the floats were in upside down ... The past owners not the one I got the bike from put em in like that I never gave it a thought putting them back in same way.

 

Well that’s interesting

 

Yes its is ...even upside down the float height was ok, just less travel for the float, fitted right way it travels more, would this have anything to do with amount of fuel in the bowls?... I watched that Ausi guy doing a carb rebuild u tube..me thinking ...What did i miss.... and there it was

 

Do you have a good new fuel line that's properly routed/oriented? I had a problem once where the fuel line kinked when I fastened the tank which caused fuel starvation.

 

It absolutely will effect how much fuel is in the bowls. It's also a fairly common PO issue with Hitachi carbs.

 

Guy's I am loosing my mind I need a vacation I had the float's in the right way will not fit upside down

 

You sure? The one in the photo looked upside down

 

Upside down in the picture.

 

Yes upside down in pic me thinking it would work lol until i installed the float needle ..no way ..they will not work that way... all back together with new jets emulsion tubes etc ..wet float height 2mm below bowl gasket, engine running ..mixture done.... not run out yet..had to throw the towel in, dam humidity plus 90f never get humidity here in C/A.... I have a gut feeling i will still have the surge, only thing left is the TDI

 

Test ride this morning 5k 6k 7k no surge .... but if i snap it to full throttle i get the surge or could be stumble and it pulls through it maybe i am expecting to much.... maybe a slow TCI..i will leave it at that as i dont think i will be needing FT... came home pulled spark plugs, look ok, burning clean not lean/not rich ..adjusted mixture screws 1/4 turn out more, steady idle 1,100 rpm.... got side stand sorted out nice to have that working...

 

If it was the TCI I doubt that you would have any improvement.
A TCI failure won't clear itself up. It'll either not spark at idle, or lose reliable spark as the RPMs rise.
If you get to where you do suspect a faulty TCI there are a several of us that will be happy to test it on one of our bikes.