Wifey went to ket the kids, so I had time to run around a little.

The air/fuel mixture screw was at 4 1/4 turns out !
Wow! No wonder it was running rich!

I adjusted to 3/4 of a turn out. I left out the white spacer, and moved the clip on the jet needle up to the 3rd position.

We'll see how that goes.  

It took awhile for the bike to start up after doing the work to the bike.  Had me worried for a little bit.  

I just found an old picture of the jets....this is a stock jet needle and shows the spacer that I used (you don't need).

The spring pushes against the clip and the spacer merely changes the upward position.  You have slots and you can adjust that distance.  Moving YOUR clip to a lower slot makes it richer.  Moving it up a slot makes it leaner.

You have backfires and need to be richer.  Where did you start?  Do you remember?

Okay first....to the 3/4 turn on the idle mixture.....with bike hot and idling, turn the screw on the right side to the fastest smooth idle speed.  It isn't the number of turns...but the fastest smoothest idle that matters.  Mine is about 2 turns out, but with different pipes and mods, everyone is a little different.

Now if the bike is idling too fast (seems to you), then lower the idle speed with the idle speed screw on the left side.  Since you don't have a tach, just lower it to just above a loping speed where letting out the clutch and accelerating is smooth without stalling or revving.

How is it so far?

I always start mine with the choke halfway out and wait about 20-30 seconds until I hear her start to gag.  Then I give her a slight throttle while pushing the choke in.  After that I usually let her idle for another minute or two just to circulate oil before riding.

Well, today's the first day I've had a chance to actually ride for more than a few minutes since adding the MAC muffler and rejetting.  She backfired worse than before and when going from higher throttle to nothing (when coming to a stop) she died twice.  I was wondering if she might.  Just with higher throttle and then sharp drop off, she kinda choked.  I'm sure it's a result of leaving the spacer in after adding the DJ kit.  I thought it might be too lean - especially with the major difference in airflow with the MAC muffler and K&N air filter done at the same time.  On Saturday I'll be removing the spacer and leaving the needle setting where it is at the 4th notch down.  That and changing to either a 155 or 157.5 Mikuni main should fix it right up, I think.  The Mikuni jets should arrive within a few days and that part won't require tank removal.

Firefighter wrote on 12/31/69 at 16:00:10:


No it isn't normal.  I gotta ask...Are you real new to riding?  Is it dying because of rider error when you start out?  As Rob says, 1/2 choke is helpful, but the weather is also warm right now too and it shouldn't need much choke.  Are you using the clutch and gas correctly to start, or is there a problem with the bike?  Is the idle speed too low?

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Okay, you adjusted it after you got back, not before.  2 turns out should be better than the 3/4 that it was.  Next time, take it for a ride before you make any adjustments to find out what change 2 turns made.

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Let's define "backfire".

Is it a "pop, pop, pop" or a 'boom'?  

And when does it "pop", or "boom'" while you are riding?

Keihin set as above gives wheelspin in second in the wet.

Clive W  

Savage_Greg wrote on 12/31/69 at 16:00:10:


Ok, referring from the top, I now have my needle set on "3".  It was on "4" and it seemed too rich, BUT, I didn't adjust the fuel mixture screw any, but it was set really lean.

I would say the slots are closer than the distance of the spacer.

I haven't removed the tank anymore since I moved it to the 3rd position.  I am gonn go right now and run it for a few and get it good and warm and see how it goes.