How to Increase a GL1200's top speed


Information and questions on GL1200 Goldwings (1984-1987)
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TenGallon
Posts: 9
Joined: Mon Mar 18, 2013 9:48 am
Location: Scranton, Pennsylvania
Motorcycle: 1986 Honda Goldwing GL1200 Aspencade. 1996 Honda Shadow ACE VT1100C2.

How to Increase a GL1200's top speed

Postby TenGallon » Fri Mar 29, 2013 7:39 am



I have gotten my 86 aspencade up to aproximately 100% (accounting for speedo variables) of its top speed quite a few times now and one thing that continues to get me is the power it has right up till it just STOPS accelerating. It seems to be behaving as though I have hit some form of governer on the motorcycle yet I am unable to find any documentation on any such thing on the gl1200s. My questions are these;

1. Does the gl1200 have a governer or rev limiter on it, or any other external factor that limits Its abilities to 115mph.

2. If said limiter exists, is there a documented and/or mechanically safe way to remove said limiter. Also, if the limiter were removed, what possible fallout would occur in terms of mechanical stress on the motor transmission etc. from running at such high rpms and mph.

P.s. I have seen quite a few posts where people are "curious" about a goldwing's top speed even though they have only "flirted" with the idea of going so fast :P I make no excuses for my love for speed and encourage others to be true to their nature as well. However, with this said, I FIRMLY believe that with great power comes even GREATER responsibility. Do not wake up one day and twist that throttle thinking you are just "too cool". Learn the road, Learn your motorcycle, and learn yourself. And above all, when that day comes, it will most likely NOT be you who makes the final mistake that lays you down. So scan ahead, and dont be a fool through the twisties :P Safe Riding, and always tell your loved ones how much they mean to you.



DaveClayton
Posts: 14
Joined: Tue Sep 29, 2009 1:24 pm
Location: Maple Ridge, BC
Motorcycle: 1985 GL1200 LTD

Re: How to Increase a GL1200's top speed

Postby DaveClayton » Wed Apr 03, 2013 1:38 am

Never found any kind of governer on any of the wings that I have owned. Sounds like fuel starvation to me. Try cleaning out your fuel filter and see if that makes a difference. I have a 85 LTD (fuel injected) and backed off the throttle at 136 MPH but it was still pulling hard and would have gone faster but enough was enough. They are not designed for that kind of speed with all the slopes and curves on the front ferring I was waiting for it to start floating but it did remain and feel stable. I did not notice what the tach was reading at that speed.

TenGallon
Posts: 9
Joined: Mon Mar 18, 2013 9:48 am
Location: Scranton, Pennsylvania
Motorcycle: 1986 Honda Goldwing GL1200 Aspencade. 1996 Honda Shadow ACE VT1100C2.

Re: How to Increase a GL1200's top speed

Postby TenGallon » Thu Apr 04, 2013 6:34 am

There may indeed be fuel starvation, as i have a slight hesitation ( dead spot) around 1500 to 2000 rpms. however, i ran another speed test and i have confirmed that 1st through 4th the rpms go up to 7k but in 5th the motor stops at exactly 5500 rpms. which is the advertised 115 mph top speed. i asked around locally and the common concensus is that i need a new ignition computer (not sure if i have that right) to change rpm setting, which is a problem because no one knows of these parts made for an 86 wing.

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virgilmobile
Posts: 7647
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
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83 GL1100 standard
84 GL 1200 I

Re: How to Increase a GL1200's top speed

Postby virgilmobile » Thu Apr 04, 2013 7:33 am

TenGallon wrote: i have a slight hesitation ( dead spot) around 1500 to 2000 rpms.


My 84 had the same problem....When you get in that rpm range...use a little "choke" and see if it won't smooth out.
On mine,I could hold at 2k rpm...add a little choke and it would pick up.....It was fuel starved in that range...viewtopic.php?f=5&t=9179

TenGallon
Posts: 9
Joined: Mon Mar 18, 2013 9:48 am
Location: Scranton, Pennsylvania
Motorcycle: 1986 Honda Goldwing GL1200 Aspencade. 1996 Honda Shadow ACE VT1100C2.

Re: How to Increase a GL1200's top speed

Postby TenGallon » Thu Apr 11, 2013 3:08 pm

Thanks for the imput. However, i have enough fuel to get up to 115mph, i just have to get through that "dead spot". What i am interested in doing is achieving a speed of over 115mph. it seems to be narrowed down to some form of rpm governor. i need to find out how to bypass it.

TenGallon
Posts: 9
Joined: Mon Mar 18, 2013 9:48 am
Location: Scranton, Pennsylvania
Motorcycle: 1986 Honda Goldwing GL1200 Aspencade. 1996 Honda Shadow ACE VT1100C2.

Re: How to Increase a GL1200's top speed

Postby TenGallon » Thu Apr 11, 2013 3:14 pm

P.s. sorry, I'm on a mobile. i see now what you were responding to. i had the same problem on my vt100c2 and yes, adding some choke does clear it up :)

BigBro
Posts: 55
Joined: Sat May 19, 2012 9:33 am
Location: Port Orchard, Wa and John Day, Oregon
Motorcycle: 1984 GL1200i Interstate

Re: How to Increase a GL1200's top speed

Postby BigBro » Fri Apr 12, 2013 9:35 am

Besides getting a little more fuel to it by using the choke slightly.

The top end speed usually becomes a factor of having enough horsepower and torque to overcome the drag coefficient.

One thought since 5th is overdrive .7 to 1 or something like that. Try dropping back into 4th that is a 1 to 1 ratio and you could actually go faster up.

Personally, while I like the speed, these things are not as stable as I would like at those rates. around 90-95 on a calm day you can feel the front suspension starting to unload.




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