85 big red jet

[8586bigred]

85 big red carb I am rebuilding is missing a jet. I have done hundreds of these carbs and never seen one missing the small jet. I have the pilot, I have the main but the little jet beside the starter jet is missing and it isn't even threaded to accept one.

[8586bigred]

First hole is the position I am talking about

[Jmoozy27]

I'm pretty sure that a little rubber plug goes in that one. Flyingw would have more info. He is somewhat of an 250es ninja.

[tri again]

Does it have a Keihin number on it
like QA 01 or similar?
Some have plugs there and later, plugs into the side of that jet stack.
I can try to look at one tomorrow if you can get a # off yours

[8586bigred]

It's a qa 04. Is the tiny jet not used?

[8586bigred]

The other 2 85 carbs I have done had all 3 jets.

[tri again]

not to be a wise guy but did it run the way it is now?
Been so long I forget but even trying to get info from Keihin directly was
like musical chairs and I distinctly remember getting absolutely nowhere.
Almost time for flyingW to chime in, I hope.
I have one to do right now and at this stage of my life, I HATE surprizes.

do parts diagrams from servicehonda or bikebandit help at all?
I guess I'll be looking at those before my next autopsy and will
report back if I find anything of interest.

sn: so you didn't find a rubber plug rolling around in the float bowl?

[Dustin87R]

I just rebuilt the carb on my 86 and it was the same except it had a rubber plug inplace of the jet.

[8586bigred]

It had an extremely high idle like 2500 probably. There is no rubber plug. 86 up had the plug and a starter jet in the side of the pedestal. The 85 isn't suppose to have a plug. I'm telling you this thing is weird. It also never had the updated vent hose kit. It started cold like a champ though.

[Flyingw]

The QA04A carb is off of the 85 TRX250. The primary jet is not used on the TRX. I have tried to run the TRX carb on my mockup and on my SX and they don't run very well unless the intake is partially blocked restricting air flow.

[8586bigred]

Well I'll be. That is awesome flyingw. Thank you for the info. I have another carb. I'll check the other carb number.

[Flyingw]

If you have an 01A, 02A, 07A, or 08A, you're good. The odd numbers are ES and even are SX. Any one of those carbs will work on any year ES or SX. They all interchange. The 04A is not a good replacement for the ES or SX.

[redsox]

guy is a carb jedi

[8586bigred]

Man you have a wealth of knowledge. So someone has "tinkered" with this beauty before apparently. I am curious how you found out this carb info. Any manuals or service info?

[Flyingw]

Here is my tutorial on rebuilding these carbs.

http://www.3wheelerworld.com/showthread.php/161746-ES-SX-350X-Carb-rebuild-Tutoral?p=1257154#post1257154