3k Stumble

[natemoen]

You want the gap to be on the wide side of the range. The gap shrinks as things wear.

[BA80]

Intake should be .006" - .008" or .16 - .20 mm

Exhaust .008" - .010" or .21 - .25 mm

Set to the wide end because these engines don't wear at the cam or the shim, they wear at the valve seat. That means the gap gets SMALLER as it wears.

Looks like you are good actually. .28 is a little wide but will run fine. Maybe a little noisy.

[spectra]

You want the gap to be on the wide side of the range. The gap shrinks as things wear.

Intake should be .006" - .008" or .16 - .20 mm

Exhaust .008" - .010" or .21 - .25 mm

Set to the wide end because these engines don't wear at the cam or the shim, they wear at the valve seat. That means the gap gets SMALLER as it wears.

Looks like you are good actually. .28 is a little wide but will run fine. Maybe a little noisy.

Thanks for the heads up! Well if it looks good then I will run with it then. Pick up some gasket maker on the way home and button it up and toss the vacuum gauge back on and sync again.

[TopCatGr58]

Yep I am new to these and learning. I just knew the carbs were really dirty so started there.

I am reading up on valves and also looking in my manual. A lot of good posts on here but now that all the pics are gone that stinks. I am a picture person

Thanks for the help!

In case you didn't see it, get and install Google Chrome browser, then check the settings, click on Extensions and get the Photobucket Embed Extension, and you will be able to see the photos again. Not sure how long this hack will work, but it does!

T.C.

[mschor]

Sync & tune on the center stand.

[spectra]

Sync & tune on the center stand.

That would work if I had one......PO took it off as it has a 4 into 1 on it.

I do have a set of factory pipes that came wit hit but they are not pretty at all. I may see if I can get them to work out as the 4 to 1 has been hit pretty good on the underside.

[DiverRay]

You can always MAKE something to work like a center stand! Best thing is to try and find a center stand, and just insert the two bolts when you need to use it. If not, try using some 2X4 blocks with a notch in one end for the frame. You do NOT need to lift the bike, just keep it almost upright.

[spectra]

Ok back together and it runs great in the garage.........take it out and falls on its face then goes but stumbles a bit till about 3 to 4 K. If I stay in the higher rpm range it runs fine.

Suggestions on where to go next ?

[motoman]

Thanks for the heads up! Well if it looks good then I will run with it then. Pick up some gasket maker on the way home and button it up and toss the vacuum gauge back on and sync again.

Actually, RE-SET idle mixtures.......then sync. Now double check idle mixtures, then re-sync AGAIN. Be sure and use a box fan of some sort in front of engine when tuning. Lastly, for sync to stay as set, shut bike off, flip and release throttle several times in order to seat screw to screw threads. Now start up and check sync again. Do this last thing a couple three times in order to seat screws in threads and sync to stay put where set. For the mid rpm range stumble, I'd remove fuel bowls and re-check those float settings for a start!

[spectra]

Actually, RE-SET idle mixtures.......then sync. Now double check idle mixtures, then re-sync AGAIN.

What is the key to idle mixture setting?

I have some time Thursday and am thinking of pulling the carbs off again and going through them one more time........I want to get this thing running good before I decide its fate.........

[motoman]

What is the key to idle mixture setting?

I have some time Thursday and am thinking of pulling the carbs off again and going through them one more time........I want to get this thing running good before I decide its fate.........

With other possible issues eliminated, back mixture screw out a bunch of turns with bike idleing. Slowly start back in till till slightest idle drop that stays dropped is noticed....stop immediately. now back mixture screw out 1/8th and no more than a 1/4 turn....done, go to next one and do the same, and last two the same way. This is known as the 'lean drop method'. May have to lower idle to the 1100rpm range as you proceed.
For a correct sync, idle may have to be lowered as you sync.

[spectra]

With other possible issues eliminated, back mixture screw out a bunch of turns with bike idleing. Slowly start back in till till slightest idle drop that stays dropped is noticed....stop immediately. now back mixture screw out 1/8th and no more than a 1/4 turn....done, go to next one and do the same, and last two the same way. This is known as the 'lean drop method'. May have to lower idle to the 1100rpm range as you proceed.
For a correct sync, idle may have to be lowered as you sync.

Thanks will try that but still want to pull the carbs one more time for ****s and giggles..........

After doing all the stuff tonight I put the gauge on there and all carbs were really close......I just had to tweak number 1 about an 1/8th of a turn to get it with the rest.

I just want this thing to run good when its on the street it always works great in the garage..........

[HalfCentury]

Did you replace the throttle shaft seals on the carb fuel rail?

If the seals are leaking, air will be drawn in causing an imbalance.

[spectra]

Did you replace the throttle shaft seals on the carb fuel rail?

If the seals are leaking, air will be drawn in causing an imbalance.

I did not.

[HalfCentury]

You may be able to spray starter spray around the throttle shaft seals while the engine is idling to see if the idle changes. The idea is the the starter spray fumes get sucked into the leaky throttle shaft seal(s) causing idle RPMs to increase.