unwanted revving issues

[BA80]

I'll bet your idle problem is carbs out of sync.

Turn signals is either a switch (left handle bar) or a wire connection problem. check ALL the plugs for corrosion or loose connection.

[MarkD]

unwanted revving issues

Hi-- update on the revving. Installed new plugs, and re-synced carbs yesterday, they were very close. Still revving,and a hanging idle, but not nearly as bad. Exhaust burned my eyes, ( too rich?) so leaned air/ fuel screws ( turned them in). They were 1 1/2 out. Inspected plugs today-- still sooty, so turned in nearly all the way to lean them more. If they are still sooty at almost all the way in, this means the mix is still too rich, so will have to switch to mikuni jets ( T C suggested the K&L pilot jets are not accurately sized-- too big).
Turn signal issue solved--There was a wire at the turn signal handlebar switch that had become unsoldered, so I tracked it down upon COMPLETE disassembly ( this time), and resoldered it ( the 3 post black plastic component). Turn signals work 100%.
Any ideas on the sooty plugs appreciated, as well as any other suggestions on the hanging idle. Thanks!----MarkD

[BA80]

If you need a source of genuine Mikuni jets let me know. It sounds as though the pilot jets may be of the aftermarket persuasion.

[motoman]

If you need a source of genuine Mikuni jets let me know. It sounds as though the pilot jets may be of the aftermarket persuasion.

I see he has a Standard. Has anyone ever considered the petcocks leaking. By this I mean if leaking by the diaphram in the petcocks, fuel can be pulled tru the vacuum lines that go from petcocks to carb boots. Not usual, but have seen it happen on here once many yrs. ago. To verify, rotate pecock levers to rear(prime). To better verify on prime, remove the vacuum lines from either petcocks or carb boots, plugging either the hose if removed from petcocks or plug nipples on carb boots and fire that thing up. Let us know here if that can be eliminated as the issue.

[BA80]

That's a thought Brant but when the octy went fruit on my special it just sprayed fuel all over the bottom of my tank.

Double diaphragm.

Possible though.

[MarkD]

unwanted revving issues

Thanks for the responses, BA80 and Motoman. There is no fuel in the petcock vac. lines, I have disconnected the tank after each run , and they have been dry. I also had the petcocks turned to prime to fill the bowls after installing the rebuilt carbs, and vac. lines were dry then, too. I am close to having it run normally, but still hung at 2,000 rpms for about 5-8 seconds after blipping throttle. It's not racing to 6,000 after being held at 3,000 rpms though, only to near 4000, and for a shorter time. This was yesterday. Plug check today ( new plugs installed before firing it up yesterday) showed pretty sooty on #1,#3,#4, not too sooty on #2. Mix screws are almost all the way in to lean it out. They are K&L aftermarket jets....wish I had known about the genuine Mikuni being the best. That's my next move.
Thanks, and keep the ideas coming, guys, we're close to solving this.
Mark D

[motoman]

That's a thought Brant but when the octy went fruit on my special it just sprayed fuel all over the bottom of my tank.

Double diaphragm.

Possible though.

no octy on Standard, so it can easily pull fuel from diaphram to boots....... very rare, but a straight shot. Mark hinting that ALL the jets not being Genuine M. jets like U earlier stated to him is the likely path to follow in order to eliminate any question there.

[BA80]

no octy on Standard, so it can easily pull fuel from diaphram to boots....... very rare, but a straight shot. Mark hinting that ALL the jets not being Genuine M. jets like U earlier stated to him is the likely path to follow in order to eliminate any question there.

Yeah but those vacuum valves work pretty much the same way.

I went down that cheap aftermarket carb parts path when I first got okie. Beat my head against the wall until I went back to original Mikuni jets.

I've never looked back since.

[MarkD]

unwanted revving issues

Hi guys, it really is looking like Mikuni jets are the only way to go, and the K&L aftermarket ones I installed are inferior/oversized for the stated size stamped on them. TC said in all likelihood, this is the problem also. I will get the Mikuni jets, as it will be pretty easy to switch out, now that I can remove and install carb bank in under an hour (now that I've done it so much.....).
BA80-- where is the best source for the jets? Thanks everyone!
Mark

[BA80]

http://www.buyatvpartsonline.com/mik...ets-c-699.html

or

http://www.jetsrus.com/a_jets_by_car..._BS_series.htm

[BA80]

Just FYI, the pilot jets will be what's causing the biggest part of the problem you're experiencing.

[MarkD]

unwanted revving issues

Hi all and BA80-- just ordered the genuine Mikuni jets in the stock sizes (main and pilot). Thanks for the help here, and to T.C., also. The K&L jets seem to have a bad rep, deservedly so, I'd say. More info to follow after a few days when they are installed.....
Thanks-----MarkD

[DGXSER]

I am interested to see the difference, only change the jets, nothing else.

[MarkD]

unwanted revving issues

Good idea, DG, will lean up to factory specs ( needles out about 2 1/2 turns, and new Mik. jets. That will be the acid test as far as K&L v. Mik. jets. Anxious to get this bike in the breeze....

[TopCatGr58]

Mark,

The stock pilot screw setting is to start at 1-1/2 turns out, not 2.5. Remember these genuine mikunis WILL be leaner than the K&L's but you'll want to start with stock setting, and then adjust/tune as needed. With your straight pipes, you may find you need more turns out....but try stock first.

T.C.