Is this Normal RPMs stay high


Information and questions on GL1200 Goldwings (1984-1987)
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sundog
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Joined: Sat Jun 05, 2010 10:53 am
Location: sanford, ME
Motorcycle: 1985 GL1200A Aspencade
1976 honda GL1000 LTD

Is this Normal RPMs stay high

Postby sundog » Thu Jun 10, 2010 10:47 am



Hello I am new to the whole world of Goldwings I bought a GL1200a last week 45,000 and in real good shape.
When I shift from 3rd to 4th,or 4th to OD @ 45 mph, I pull in the clutch and the RPMs rise about 500 rpm with my hand off the throttle.
In OD if I pull in the clutch the RPMs stay around 2250 and just hang there. If I shift early 1st to 2nd at 10mph 2nd to 3rd 20mph
3rd to 4th 30mph than 4th to OD/5th @ 35 it doesn't happen. If I am in neutral and not moving the RPMs rise and fall like every other bike I've had.
Is this normal and I just need to shift early than my past rides.



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thrasherg
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Re: Is this Normal RPMs stay high

Postby thrasherg » Thu Jun 10, 2010 12:04 pm

This does not sound normal, I do not have a 1200 but have never heard of this behaviour. An engine should always return to idle when the throttle is closed and the clutch pulled in.. Do you have a cruise control? and is it misbehaving? otherwise I think a bit of investigation is required.

Gary

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sundog
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Joined: Sat Jun 05, 2010 10:53 am
Location: sanford, ME
Motorcycle: 1985 GL1200A Aspencade
1976 honda GL1000 LTD

Re: Is this Normal RPMs stay high

Postby sundog » Thu Jun 10, 2010 2:01 pm

I don't have cruise control. I have never had this happen before. I had an idea that my clutch is not disengaging all the way.
It only happens when I am rolling.

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thrasherg
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Motorcycle: 2004 GL1800, 2005 Honda Shadow 750, 2008 Yamaha R6 with RG500 engine, CRF450X, CRF230, CRF250X, XR200, CR500

Re: Is this Normal RPMs stay high

Postby thrasherg » Thu Jun 10, 2010 2:15 pm

If the bike is stationary with the engine running, is it difficult to move from 1st (or 2nd) to Neutral? A dragging clutch as you describe might keep the engine RPM up when the bike is moving, but would more likely display itself by making it very difficult to locate Neutral when the bike is stationary. Next time you are out, could you start riding, get into second gear and then when you have some speed pull the clutch in and select neutral? If the engine still revs up (and the bike is in neutral) then you will have shown that it is not a dragging clutch, if the revs drop as it goes into neutral (with the bike still moving at a reasonable speed) then it would suggest a dragging clutch. I really doubt it is the clutch, but it should be quite simple to prove one way or the other. :)

Gary

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WingAdmin
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Re: Is this Normal RPMs stay high

Postby WingAdmin » Thu Jun 10, 2010 3:10 pm

You can also start the bike up when it is on the center stand, put it into first gear, and pull the clutch in. If the rear wheel still turns, then you know the clutch is dragging. You'll need to do this when the engine is warm, as the cold oil is viscous enough that it can couple the input and output parts of the clutch.

If the clutch is dragging, first thing to do is to bleed it. Air in the clutch line can cause a dragging clutch, and this is the easiest (cheapest, fastest) fix. If after bleeding it's still dragging, then you're on to more involved (read: expensive, time-consuming) solutions.

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thrasherg
Posts: 1837
Joined: Tue Oct 20, 2009 11:21 am
Location: Plano, TX
Motorcycle: 2004 GL1800, 2005 Honda Shadow 750, 2008 Yamaha R6 with RG500 engine, CRF450X, CRF230, CRF250X, XR200, CR500

Re: Is this Normal RPMs stay high

Postby thrasherg » Thu Jun 10, 2010 4:32 pm

Wingman suggestion will work as well, although I find most wet clutches have enough drag (due to the oil they are immersed in) that testing on the center stand is often unsure (most bikes will turn the rear wheel with the clutch pulled in and you end up using your foot to stop the rear wheel turning and trying to decide if the amount of force you use to stop the back wheel is due to a dragging clutch or just the oil). As Wingman says make sure the engine is good and warm so the oil in the clutch will drag less.

Gary

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sundog
Posts: 9
Joined: Sat Jun 05, 2010 10:53 am
Location: sanford, ME
Motorcycle: 1985 GL1200A Aspencade
1976 honda GL1000 LTD

Re: Is this Normal RPMs stay high

Postby sundog » Fri Jun 11, 2010 5:57 am

I will try both idea today after work and will report back on what happens. I worked late last night and could not play with the bike.

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sundog
Posts: 9
Joined: Sat Jun 05, 2010 10:53 am
Location: sanford, ME
Motorcycle: 1985 GL1200A Aspencade
1976 honda GL1000 LTD

Re: Is this Normal RPMs stay high "its fixed"

Postby sundog » Wed Jun 16, 2010 6:14 am

I told my guy what was going on and he said it was a vacuum leak around the carbs.
Later he told me the leak was around #1 and #4 carb, and that there was grease pencil markings that said
gl1200 on #1 and #4 carb so some had replaced them with junk yard parts. all said and done he mounted my new tires and
fixed the problem @ a cost of 200.00 the bike runs fine.




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