Removing Smog Equipment from a California FJ1200

[Power2Go]

Greetings All,

I would like to remove all the smog equipment from my '91 FJ1200. I have the carburetors off to fix the plugged jet issue and it looks like the best time to simplify the system.

Is it as easy as simply removing all the hoses and the canisters and plugging the ports? Or are there hidden issues I need to be aware of?

Has anyone documented the modifications here?

Thanks for the help!

[CutterBill]

The only smog equipment on your bike (and mine) are the two carbon canisters which absorb the gas fumes from the float bowls and gas tank.  Removing them won't cause any issues, but neither will it improve performance.  But I understand how you would like to simply clean up that area.  I'm doing the same thing.  Just make sure the bowls and tank are in some way still vented.

Also, be sure to save the parts.  If California ever decides to start smog checking bikes...   
Bill

[Power2Go]

Thanks, Bill,

Do you know if there is anything in the smog system which, if it fails, will prevent the engine from running properly? I'm pretty much convinced, though, after reading other threads here, that the air pilot jets must be clogged.

This motor seems to behave as if the bowls run out of gas when the revs are increased. I can rev it up to about 3000 but it will not go higher and pretty quickly it drops and will not run faster than idle speed. However, if it stays at idle for a bit, I can then rev it up again. Also, it will not stay running under load. Are these typical symptoms of clogged pilot jets?

I can imagine all sorts of other causes, like a plugged fuel filter, poor fuel pump performance, clogged smog circuit, etc. It seems like the other descriptions of poor performance, caused by plugged jets, match this one pretty close - just not exactly.

The reason I'm leaning more towards the clogged jets is because the bike HAS been sitting idle for a few months and everything was working previously and, I might add, running well.

I'm going to shoot some carb cleaner through the pilot jets tomorrow but may end up pulling them out. If they're really bad, I guess I'll have to disassemble the carbs further.

Cliff

[CutterBill]

To repeat... there is no "smog circuit."  The carbon canisters are the only smog parts.

Your bike's symptoms sound like the typical fuel supply issue... the carbs are getting enough gas to idle and rev slightly, but not enough gas to run faster.  Most likely cause would be a clogged fuel filter.  Could also be something as simple as a pinched fuel hose (restriction.)  Check the fuel flow out of tank.  Check the fuel pump output.

[simi_ed]

I have a '89. I removed the canisters.  The 'boost valve' (near headlight, right side on subframe) only serves as an ignition advance on trailing throttle.  That's the total of the smog equipment on a 89.  

You have a fuel problem. Clogged jets, clogged filter, clogged needle screens-something.  Clogged anything in a set of FJ carbs means a crappy running bike.  

Take the carbs off & start cleaning.  Make sure the pilots are #40s. Get a set of stainless screws from Randy.  The OEM air box is a PITA.  I recommend Randy's Uni filters too.    
Follow the instructions in this link:http://www.fjowners.com/index.php?topic=655.0
Reassemble, ride, enjoy!  Be perpared to repeat the cleaning process (in small sections, if you're lucky) as needed.

This what I've done & do, YMMV.

Ed