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weird flat spot off idle gl1500

1076 Views 3 Replies 4 Participants Last post by  OnaWingAndaPrayer, 
T
Okay,
So I have a flat spot right above idle om my 89 Gl1500. The bike was ridden only about 250 miles over the last yr. before I bought it. Figured a little varnish so I dosed it with Seafoam. Also realized it was i bit cold blooded and will rev it a couple times before I ride off. Now it seems to hit a spot around 1500 - 2000 rpm where it just kinda stays flat, when I give it a bit of throttle it will surge forward and pull clean. Not real bad but gives some uncertainty especially when turning at a stop sign as there isn't any smooth momentum. I was curious as to how much play there should be in the throttle ? I can turn the grip about 1/4 inch before you can feel the pressure from the cable. The idle is smooth as glass at 800-900 rpm no surging etc. so not thinking of vacuum leak but could be wrong. Kinda leaning toward either adjustment on throttle cable or needs lubed or obstructed pilot jet. Any insight would be helpful. Thinking of pulling air cleaner housing and blasting carb cleaner on linkage and throats of carbs.
Sorry for the book,
Thanks,
Chris
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DriverRider
Transam1 said:
Okay,
So I have a flat spot right above idle om my 89 Gl1500. Also realized it was i bit cold blooded and will rev it a couple times before I ride off. Now it seems to hit a spot around 1500 - 2000 rpm where it just kinda stays flat, when I give it a bit of throttle it will surge forward and pull clean. Not real bad but gives some uncertainty especially when turning at a stop sign as there isn't any smooth momentum. I was curious as to how much play there should be in the throttle ? I can turn the grip about 1/4 inch before you can feel the pressure from the cable. The idle is smooth as glass at 800-900 rpm no surging etc. so not thinking of vacuum leak but could be wrong.
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That it doesn't surge at idle is a good sign. What do you mean cold blooded, can you elaborate.

Main problem seems to be the flat spot, can you recreate it on the center stand by just turning the throttle. If you can it may be lean and some more diagnostic work needs to be done. One area of concern would be the accelerator pump. However, if you can recreate it on stand by just holding the throttle steady with the engine breaking down it is likely to be the lean fuel condition.

http://www.goldwingfacts.com/forums.../426066-1500-fuel-mixture-diagnosis-test.html
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Cornpone
Transom,

The answer I gave you on the GWOF IS the answer, sir, at least IMHO.

Kevin/Tatanka
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OnaWingAndaPrayer
If I recall correctly the 88/89 Wing was known to have an off idle flat spot . It seems Mother Honda corrected by changing out the jets .

check this thread link for more info : 88 Off Idle Hesitation, Recall, Carb. 'Upgrade' Parts, Trigger Wheel.. - Steve Saunders Goldwing Forums
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