Off Idle Hesitation or Bogging


Information and questions on GL1000 Goldwings (1975-1979)
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drfrank01
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Off Idle Hesitation or Bogging

Postby drfrank01 » Wed Aug 19, 2015 9:24 am



I have a 77 GL 1000. It has sat for several years maybe as many as 6 or more without starting. When I got it I found some basic problems with timing and point settings and corrected these and found a broken plug wire as well so I know it was not run for a while. Hooking up some gas (Tank was rusty so did not use it from there) the bike cranked and started with very little effort on my part and after a short warm up it idled smoothly.
I was very surprised and I have done nothing to the carbs to date except check and sync them and adjust the idle mixture to some extent (Very little was needed). This Bike came with Jardene 4 into 2 headers and the motor was very CLEAN and I think some work has been done on the engine (Only God knows what, but there is absolutely NO engine noise no ticking or the chain in the trans clanking etc). I have run the bike about 5 times now and taken 2 15+ mile rides on it. It idles smoothly when stopped and runs INCREDIBLY well when you get it moving BUT....

Coming off Idle from a stop it wants to bog or hesitate and you have to flutter the throttle to get some engine speed or power and once you get moving It runs VERY well, much faster than the other GL I have.

Air cleaner is new but I have not done any carb work to this point. I have had other bikes with Tuned Exhaust headers and have had them over jetted to aid performance but I don't think this is the problem here although it may be. I am leery of messing with the carb jets and have not checked the condition of the plugs for lean or rich mixture yet. (They are used plugs as well and I am going to replace them before the next ride.

I am going to recheck the timing

When I checked the idle mixture adjustment the screws were OUT about 4.5 turns average. I reset them to 2 and believe now they are bout 2.5 turns out.

Any suggestions?

thanks
Frank



flash1942
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Re: Off Idle Hesitation or Bogging

Postby flash1942 » Wed Aug 19, 2015 9:39 am

With the exhaust system you have you might want to experiment with the main jets and sometimes the transition from idle range to power can be improved with a size larger idle jet. Yes a plug check is important.

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spiralout
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Re: Off Idle Hesitation or Bogging

Postby spiralout » Wed Aug 19, 2015 9:55 am

Read these before you go messing with the main and idle jets. That usually isn't necessary with exhaust modifications on the 1000.
http://www.randakksblog.com/how-to-cure-off-idle-flat-spot/
http://www.randakksblog.com/special-tuning-tips-for-77-gl1000s-carb-top-service/
Actually, you should read everything on that site about the 1000. Great tips there from the master.

drfrank01
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Re: Off Idle Hesitation or Bogging

Postby drfrank01 » Wed Aug 19, 2015 10:06 am

Thanks for the links.

I knew I had read about the off idle hesitation somewhere but forgot where.

Frank

flash1942
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Re: Off Idle Hesitation or Bogging

Postby flash1942 » Wed Aug 19, 2015 2:46 pm

Randakk has something there.

Old Fogey
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Re: Off Idle Hesitation or Bogging

Postby Old Fogey » Wed Aug 19, 2015 6:57 pm

Before you run it much more, change the timing belts! In fact before you run it ANY more, change the timing belts!
Yes, it really is that important.
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drfrank01
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84 BMW R100 RT SOLD
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Re: Off Idle Hesitation or Bogging

Postby drfrank01 » Wed Aug 19, 2015 7:38 pm

I believe this motor has been worked over pretty well which is why I did not get into the carbs right off the bat.

I checked the timing belts and they look brand new. Thanks but I thought of doing that when first started on the bike.

I have some jets as per the off Idle fix from randakk and will drill and replace the original idle jets with the new ones to see how that works.

Thanks all you guys for the help and info.

Frank

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spiralout
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Re: Off Idle Hesitation or Bogging

Postby spiralout » Wed Aug 19, 2015 8:11 pm

drfrank01 wrote:...and will drill and replace the original idle jets with the new ones to see how that works

Frank

idle air jets, not the idle jets. Maybe just semantics, but important in this case. Shimming the needles made more of a difference than the air jets did on mine. Good luck!

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Re: Off Idle Hesitation or Bogging

Postby Old Fogey » Wed Aug 19, 2015 8:29 pm

The timing belts will look like new seconds before they snap! You simply cannot tell by looking at them.
Trust me on this. Or do a timing belt search on here and other forums. 5 years or 25K miles on a running bike. If it has been sitting for along time without the engine being turned over regularly, the belts can take a set due to being under tension.
A pair of belts will cost you under $40; a wrecked engine considerably more!
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'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

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Re: Off Idle Hesitation or Bogging

Postby WingAdmin » Thu Aug 20, 2015 10:16 am

drfrank01 wrote:I checked the timing belts and they look brand new. Thanks but I thought of doing that when first started on the bike.


Old Fogey knows of what he speaks: replace the belts! The worst thing that can be done to timing belts is to let the bike sit for a time without running. Belts that are are going to fail the next time the bike is started can look exactly the same as belts that were put on yesterday - you cannot tell the state of timing belts by inspection, as the wear happens internally.

Read the intro here for more info: viewtopic.php?f=14&t=9774

drfrank01
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84 BMW R100 RT SOLD
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Re: Off Idle Hesitation or Bogging

Postby drfrank01 » Thu Aug 20, 2015 1:35 pm

I thought about what was said and agree. I ordered the belts and will replace t hem when they get here.

Seems to me that many cars sit as oldies and junkers until someone gets them and runs them without issue (I have a friend who does just this) without timing belt failure.

BUT better safe than sorry.....

thanks
Frank




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