Dyna Muffler on GL1000, RPM's

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codyjames707
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Dyna Muffler on GL1000, RPM's

#1

Post by codyjames707 »

Hey everyone!

I recently installed some Harley Dyna mufflers onto my 1977 GL1000 and I have been attempting to balance the carbs, but the bike seems to be a bit high on the idle end. The vacuum tubes on the carbs are balanced (#2 looks off, but it is adjusted due to it being off from the start) and the idle screw seems to be in a sweet spot because if I loosen it, the bike will die out quickly.

So, with the idle screw and carbs seeming balanced, the motorcycle is idling between 1600-1800 rpm's. Obviously this is off from the standard 1000-1100 rpm's that most people aim for, but I'm wondering if this is due to the aftermarket Dyna mufflers that I have installed on it or if I am just blind to another issue I'm not seeing. It does seem to be sounding/running fine in this idle, not too hot or anything, but the standard idle rpm's have me second guessing myself. =/

Maybe I'm all good or maybe I'm messing up, hope to figure it out! =)

Thanks for your help!
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Re: Dyna Muffler on GL1000, RPM's

#2

Post by Whiskerfish »

Nope. Based on your description I would suspect something is off on your carb setup. The idle screw should be able to back it down to well below a 1000 without dying. It may sound less than ideal but a good rack of carbs on a decent 1000 engine should be able to hold a idle down to about 500 or 600. Either your engine is not hitting on all 4 at idle or your synch is way out of whack. Try getting it as low as you can and then figure out which jugs are hot and which are not. Spray bottle of water on the headers or pull plug wire or whatever. I do not know if the idle drop will work at that high of an idle but you may try that.
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Re: Dyna Muffler on GL1000, RPM's

#3

Post by flyin900 »

Something is off with the higher idle and it maybe a variety of things. If your sure there are no air leaks then I recall that there can be an issue with the mechanical connectors of the linkages where the sync set up is located. The one set that can be suspect is the sync set that balances the left bank right bank sync of the motor.
By bending the tabs slightly where the screw set is located it corrects a hanging idle. There was some written coverage done on this in previously posted info possibly from Pistol Pete, or another carb specialist.
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Re: Dyna Muffler on GL1000, RPM's

#4

Post by ritalz »

Possible there is not enough slack in the throttle cable(s).
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Re: Dyna Muffler on GL1000, RPM's

#5

Post by pidjones »

Also, try an electronic tach. Your mechanical tach is now ~45 years old. How accurate is it?
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Re: Dyna Muffler on GL1000, RPM's

#6

Post by gltriker »

Here's a yeah sure recommendation.
Set all 4 carburetors' air/fuel pilot adjustable screws at 3 turns out from lìghtly seated. Yes. Leave them set there 'til the end of time
Now, idle speed synchronize the carburetors, again. 900 rpm is maximum engine idling speed to synchronize at.

Just try it.

pidjones' recommendation to utilize an 'electronic' tachometer is Very Good advice!
Last edited by gltriker on Sun Jun 26, 2022 10:17 am, edited 1 time in total.
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Re: Dyna Muffler on GL1000, RPM's

#7

Post by pidjones »

The 3 turns pilot screw (3 1/2 on 78-79) is good. Honda sets them lean for emissions reasons, not performance or rideability.
"Love 'em all.... let God sort 'em out!"
Ex 2006 GL1800 - the Black Pearl SOLD! to make room for:
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1975 Red GL1000 project - ex Pistol Pete project
1972 Triumph T150V Trident rescue - finished and FOR SALE!
1976 Yamaha RD400c
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Ex 1978 GL1000
Ex 1979 GL1000
Ex '79 CB750F rat bike
Ex '86 SEi
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Re: Dyna Muffler on GL1000, RPM's

#8

Post by Fred Camper »

GL1000's are also not very sensitive to slight back pressure change with different brands of properly sized mufflers. No change to mine when I put Sportster Muffs on.
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Re: Dyna Muffler on GL1000, RPM's

#9

Post by redglbx »

On mufflers, mine couldn’t give a shite on what I use ! Now changing the head pipes to after market pieces with real collectors was noticeable vs the oe with one pipe just run into the side of the other. But probably wouldn’t have noticeable if it hadn’t been done back to back.

Did lean the jetting outa scosh but not enough to warrant any jetting changes since they are so rich on the mains anyway. A 1/4 more open on the idle screws more than made up for it.
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Re: Dyna Muffler on GL1000, RPM's

#10

Post by gltriker »

codyjames707 wrote: Fri Jun 24, 2022 10:40 pm Hey everyone!

I recently installed some Harley Dyna mufflers onto my 1977 GL1000 and I have been attempting to balance the carbs,

I'm wondering if this is due to the aftermarket Dyna mufflers that I have installed

Maybe I'm all good or maybe I'm messing up, hope to figure it out! =)
Thanks for your help!
20220621_153844.jpg
20220623_151912.jpg
The volume of exhausted gases discharged into the exhaust system is so small at engine idling speeds that, unless the mufflers were almost totally restricted, the effect those Dyna mufflers will have on your carburetors' engine idle speed synchronizing session is negligible.

I can tell you that with confidence and authority. My trike's 1975 engine with 1976 LTD carburetors installed ran well with Dyna Slash cut mufflers for approximately 15,000 miles. Harley-Davidson Catalyst mufflers. Both sides.
The engine would always, consistently return to a slightly rolling/loping 1100 -ish rpm engine idle speed, everytime. (Pilot air/fuel adjustments screws All set at 3 turns out from seated. all 8 valves' lash clearance set at 0.006", too)
Eventually, the right side muffler's Catalyst element finally became carbon fouled with a tank full of seemingly contaminated fuel.( 60 miles from home, by myself, had no choice but to ride.)
The engine still idled well as the restriction issue developed .
BUT Anything in excess of 3,000 ish, engine loaded rpm was tell tale that a genuine problem had developed.

Done ;)
Cliff (74yrs ;) )

Keep your eyes and ears open and you'll learn something new, everyday. tumb2

New users please visit our "Shop Talk" for common tips and help: <---jdvorchak
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^^^^^^^click up here^^^^^ :oldies

RE: a thorough fuel tank cleaning
"And your carbs will thank you. They no longer live down stream from a sewage plant." -gregforesi tumb2
"Can't see the paint when your looking thru the handlebars..........." -Oldewing ;)
"I'd rather Ride than Shine" -RAT tumb2 Me Too!!

Cliff

'75 GL1000 home built trike; http://www.ngwclub.com/forum/viewtopic.php?f=30&t=39996
October,2017 BOTM :shock: https://nakedgoldwingsclub.com/forum/page/Welcome

previous rides:
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Re: Dyna Muffler on GL1000, RPM's

#11

Post by codyjames707 »

Thank you for all of the replies! It really helps to make me feel less crazy on this whole thing. I'm still tinkering with it, but I at least have it down to 1200-1400 RPM's, so there's progress. I'll be tinkering with it today again, but all of your suggestions and help was HUGE, so thank you for the help again!

anim-cheers1

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Re: Dyna Muffler on GL1000, RPM's

#12

Post by ericheath »

Remember you are syncing everything to the base carb, #3. If you start with that butterfly too open, you can sync until you’re blue in the face and still have a high idle. Make sure the throttle plate can close all the way or very nearly all the way when you turn the idle screw down.

I use a method someone here posted many years back. He used the one of the three holes in the base of the carb throat as a guide. Set numbers three at about 1/2 of the hole covered, then match the others to it as best as you can visibly using sync screws. Start it, warm it up, if the idle is high or low use the idle screw on the bell crank. Once running reasonably well, sync the carbs to each other.
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Re: Dyna Muffler on GL1000, RPM's

#13

Post by gltriker »

Are you familiar with this ?
https://www.randakksblog.com/carb-synch ... /#more-383

Along with a probability two flat washers in the #2 and #4 synchronizer link assembly may be installed incorrectly, there is an additional issue with a very slight interference in that same synchronizer link that will cause difficulties when trying to idle speed synchronize the GL1000 carburetors.

Right now, I don't know where in this Forum that relatively unknown information is hiding, though. It requires a very slight nudge with a flat blade screwdriver in a designated location in that #2 and 4 carburetors' synchronizer to remedy the interference.

Seems that information was passed on, into this Forum by a Club member that was very fortunate to have been guided by Pete Boodie to successfully find and correct the very troublesome situation. May have been posted within the past 5 years. ??

I can't remember that Club member's name. Anybody here remember where that Pete Boodie information might be found?
Cliff (74yrs ;) )

Keep your eyes and ears open and you'll learn something new, everyday. tumb2

New users please visit our "Shop Talk" for common tips and help: <---jdvorchak
http://www.ngwclub.com/forum/page/ST
^^^^^^^click up here^^^^^ :oldies

RE: a thorough fuel tank cleaning
"And your carbs will thank you. They no longer live down stream from a sewage plant." -gregforesi tumb2
"Can't see the paint when your looking thru the handlebars..........." -Oldewing ;)
"I'd rather Ride than Shine" -RAT tumb2 Me Too!!

Cliff

'75 GL1000 home built trike; http://www.ngwclub.com/forum/viewtopic.php?f=30&t=39996
October,2017 BOTM :shock: https://nakedgoldwingsclub.com/forum/page/Welcome

previous rides:
1953 H-D Servi-car, naked, 1969-1978 (serial#53G1559 committed to memory!)
1980 CB900 Custom (triked) 1997-2003 .... R.I.P.
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