rpm's go up while shifting


Information and questions on GL1500 Goldwings (1988-2000)
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kt0937
Posts: 21
Joined: Sun Sep 19, 2010 12:14 am
Location: Rowlett, TX
Motorcycle: 1989 Goldwing 1500, Blue

rpm's go up while shifting

Postby kt0937 » Mon Jan 02, 2012 3:18 pm



OK, here is my story. I have a new to me 89 1500 with 149k. I have lubricated the throttle cables so it snaps back when you let go. When I go to shift, while pulling in the clutch and backing off the throttle the rpm's DO NOT go down which actually makes them go up with no clutch engaged. Also does the same thing when down shifting except when I shift from 3rd into 2nd and then it does what it should. I know I'm missing something but what? Any help would be welcomed. Vacuum line? Relay switch or other part? I have no idea.



User avatar
virgilmobile
Posts: 7649
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: rpm's go up while shifting

Postby virgilmobile » Thu Jan 05, 2012 10:38 am

I've found problems with vacuum lines.Mostly the ones with a sharp 90* bend in them.There's one on each manifold(left and right side) 2 on the carb assembly and 1 under the carbs,below the rubber mat.
Here's a link for more info.These hoses (at the 90*) can weaken,get very thin and collapse under deceleration rendering the carb control system useless.
http://www.hrot.org/martino/carb/index.htm

User avatar
kt0937
Posts: 21
Joined: Sun Sep 19, 2010 12:14 am
Location: Rowlett, TX
Motorcycle: 1989 Goldwing 1500, Blue

Re: rpm's go up while shifting

Postby kt0937 » Sat Jan 07, 2012 9:59 pm

I pulled the carbs today and looked at the vacuum lines under the rubber mat. Wow were they bad. Just touched them and it crumbled to dust. Not enough time to finish before I had to leave for work (overnight shift) so I will finish tomorrow and repost. Thanks for the help.

User avatar
virgilmobile
Posts: 7649
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: rpm's go up while shifting

Postby virgilmobile » Mon Jan 09, 2012 4:50 pm

While your checking things out,check your shifting lever for abnormal end play.I consider more than 3/16 free travel to be something to look at.I've posted about this as my 88 was badly worn and leaking oil from the shifting rod (50k miles)...viewtopic.php?f=6&t=9365 and the repair......viewtopic.php?f=6&t=9448
One other question,does yours still have the original cornering lights(that may not work) ??
Neither of mine would light up..I found both relays were bad and the lights are old style motorcycle headlight bulbs.I've converted them to a standard park/turn lamp and replaced and rewired a new relay to run them as marker lights and turn bright for cornering. :)
I can't leave well enough alone...I just gotta tinker a bit. ;)

User avatar
kt0937
Posts: 21
Joined: Sun Sep 19, 2010 12:14 am
Location: Rowlett, TX
Motorcycle: 1989 Goldwing 1500, Blue

Re: rpm's go up while shifting

Postby kt0937 » Mon Jan 09, 2012 5:01 pm

Mine does not have the cornering lights. As for the shifter, it is a bit loose but not leaking. I'll read the post and see if I can fix it myself. Thanks for the help

User avatar
kt0937
Posts: 21
Joined: Sun Sep 19, 2010 12:14 am
Location: Rowlett, TX
Motorcycle: 1989 Goldwing 1500, Blue

Re: rpm's go up while shifting

Postby kt0937 » Sun Jan 15, 2012 5:53 am

After replacing ALL the vacuum hoses I am happy to report that it has made a huge difference and runs like new now. Now to deal with a non working compressor :oops:




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