Interstate carb springs

[brian1726]

I did the interstate carb spring swap on my 2000 std yesterday & much
to my surprise one the the springs had broken in half
Rode her to work yesterday & I was surprised by the difference.
cheers...
Brian 

[sandy]

Are you saying one of the original springs had broken? That would make a big difference.

[Chrisj CMA]

I did the awitch tonight as well, have not rode it yet, but the throttle is snappier, and feels more oistitive for lack of a better word....cant wait to test her out tomorrow

[Chrisj CMA]

Just got back from a ride on the Valkyrie Std with IS carb springs installed.  I guess we all hope for like 10 more hp every time we improve something.........of course that didnt happen, but I was well pleased.  I like to keep the throttle cables nice and tight so low speed control is very responsive.  Its not fun to deal with a delay in power because of throttle cable slack.  These springs made the engine perform like I adjusted the throttle cables.  It felt more responsive at low speed and that was my main reason for doing it.  Also I run a throttle boss and with these new springs there is a bit more resistance on the throttle so its harder to accidentally apply power with the palm of my hand and its easier to maintain a steady speed utilizing the throttle boss.

Really the best way to describe the improvement is.....It makes it feel newer again.  So, over all I think it was worth doing.

[Ricky-D]

with these new springs there is a bit more resistance on the throttle

That's the placebo affect.

There is no physical connection between the diaphragm springs and the butterfly valves.

***

[Chrisj CMA]

with these new springs there is a bit more resistance on the throttle

That's the placebo affect.

There is no physical connection between the diaphragm springs and the butterfly valves.

***

You could be right about that......I dont know, it felt better in a very subtle ways and maybe my explanation is lacking.....the point is, if you want to know if its worth the effort to do it, I say yes, its a nice little improvement IMHO

[98valk]

with these new springs there is a bit more resistance on the throttle

That's the placebo affect.

There is no physical connection between the diaphragm springs and the butterfly valves.

***

correct, they are vacuum carbs, engine vacuum determines if the slides are raised or lowered not the throttle.

[brian1726]

Went for a 200km ride yesterday with the wife on board & I was very happy with the results.
The throttle response is improved but 1 of the springs I took out was broken in half with the
top half sitting in the carb top ...very strange
When I get time,next mod will be a 4degree trigger wheel
cheers...
Brian 

[pocobubba]

I have a Standard and an I/S . The I/S throttle response does feel smoother and quicker than the Standard . Are the springs responsible for the difference ?  Why are they different ?

                                                        Thanks

[Pete]

I have a Standard and an I/S . The I/S throttle response does feel smoother and quicker than the Standard . Are the springs responsible for the difference ?  Why are they different ?

                                                        Thanks

To improve throttle response on the I/S as it weights more, the springs are slightly weaker.

[98valk]

I have a Standard and an I/S . The I/S throttle response does feel smoother and quicker than the Standard . Are the springs responsible for the difference ?  Why are they different ?

                                                        Thanks

weaker spring allows the slide to rise faster thereby pulling the needle out of the fuel well allowing more fuel to enter the air stream sooner. two reasons, to prevent any possible detnotation due to the faster advance curve of the ICM and due to the increased weight of a fully loaded I/S.
a weaker spring acts similar to an accelerator pump.

[Flrider]

Just got back from a ride on the Valkyrie Std with IS carb springs installed.  I guess we all hope for like 10 more hp every time we improve something.........of course that didnt happen, but I was well pleased.  I like to keep the throttle cables nice and tight so low speed control is very responsive.  Its not fun to deal with a delay in power because of throttle cable slack.  These springs made the engine perform like I adjusted the throttle cables.  It felt more responsive at low speed and that was my main reason for doing it.  Also I run a throttle boss and with these new springs there is a bit more resistance on the throttle so its harder to accidentally apply power with the palm of my hand and its easier to maintain a steady speed utilizing the throttle boss.

Really the best way to describe the improvement is.....It makes it feel newer again.  So, over all I think it was worth doing.

Chris

Did you do the needle shims as well or just the springs?

[Ricky-D]

There is nothing to be gained by making the engine run more richly. (ie. raising the needles)

These bikes already run rich and that has been well documented over the years, on this forum.

***

[salty1]

Chris would you also verify the part number of the spring you used? Thanks!

[Chrisj CMA]

Chris would you also verify the part number of the spring you used? Thanks!

sure its:  16050-MBY-671   And whether or not I can give the proper technical explanation, the net result I feel by changing the springs is a throttle that is more responsive at slow speed and more stable and highway speed.  I still think I feel more resistance in the grip.  Maybe its due to more vacuum pressure affecting the process but anyway....I like it.

And, no, I didnt change anything but the springs

[Hoser]

Chris would you also verify the part number of the spring you used? Thanks!

sure its:  16050-MBY-671   And whether or not I can give the proper technical explanation, the net result I feel by changing the springs is a throttle that is more responsive at slow speed and more stable and highway speed.  I still think I feel more resistance in the grip.  Maybe its due to more vacuum pressure affecting the process but anyway....I like it.

And, no, I didnt change anything but the springs

I have IS springs on my tourer, I like them too. Hoser 

[98pacecar]

Install is like, a 20-30 min,,,,,,,, job ??     

[Hoser]

Install is like, a 20-30 min,,,,,,,, job ??     

Yes

[Disco]

I switched to IS carburetor springs about 40K ago and couldn't tell the difference.   ???   

I switched to IS ICM about 12K ago.  I think I felt a small difference, but it's subtle.   

[98pacecar]

Says, these bikes use em,, stock.....

1999 GL1500CF A CARBURETOR COMPONENT PARTS
1999 GL1500CF AC CARBURETOR COMPONENT PARTS
2000 GL1500CF A CARBURETOR COMPONENT PARTS
2000 GL1500CF AC CARBURETOR COMPONENT PARTS
2001 GL1500CF A CARBURETOR COMPONENT PARTS
2001 GL1500CF AC CARBURETOR COMPONENT PARTS

That's    da tourer AND,,,  da interstate  isn't it?     

[Tundra]

When I went with the Interstate springs I wanted to believe I felt a difference, who knows? nothing noticeable to me.
  Then changed ICM, trigger wheel and went with a K&N filter, no pre-filter and shimmed needles. Now there is a noticeable difference and flat spot is gone. Runs like a Monster and the plugs look perfect. I will never touch it again, runs strong and good milage.

[brian1726]

I thought about shimming the needles,but was unsure of the shim's to use.
Can you shed some light on this?
Thanks...
Brian.

[Ken Tarver]

Pacer, all those are IS, that would be the CF designation.

Ken

[Tundra]

Brian1726
Best reference...
http://www.rattlebars.com/mtz/shims.html
 Hats off to Chet, who made this and all your valuable efforts and contributions to the Valkyrie community. You have been a great help to me over the years

[98pacecar]

Pacer, all those are IS, that would be the CF designation.

Ken

Ok thanks,,,   

  Can you tell me the difference between the ''A'',, and ''AC'' ?     

[Jess from VA]

Pacer, all those are IS, that would be the CF designation.

Ken

Ok thanks,,,   

  Can you tell me the difference between the ''A'',, and ''AC'' ?     

CF is interstate.

CT is camel toe.

[fudgie]

Pacer, all those are IS, that would be the CF designation.

Ken

Ok thanks,,,   

  Can you tell me the difference between the ''A'',, and ''AC'' ?     

CF is interstate.

CT is camel toe.

 
 

[The emperor has no clothes]

Pacer, all those are IS, that would be the CF designation.

Ken

Ok thanks,,,   

  Can you tell me the difference between the ''A'',, and ''AC'' ?     

I think the AC is the California model but I could be wrong, but they are correct about CT being the cameltoe model

[Bone]

Mine is a 98 Black and Chrome Camel Toe.  Always wanted one of those AC (air-conditioned) models only available in the warmer states.

[Hoser]

Here is a picture of the camel toe model.  Hoser   

[berdoobuck]

Hope there's someone out there.
Working on my '98 std.  Have 6X6 pipes, which were too damn loud (I would have got a HD if I wanted lots of noise).  Installed 12" baffles.  Much better, but then way too rich.  Fiddled and adjusted (does Honda make those air/fuel mixture screws so hard to adjust deliberately? ) I had to take it back to the shop for a second adjustment.  Now the bike runs much better, but it only starts to stride when I get to turning 2800 rpm.  Here's the question -- will the IS springs improve the low end sluggishness, or should I look at changing out the needles?  The commentary I've read is all to the good but my concern is that my Fat Lady, being a '98, is it a good fit with these springs?

[quexpress]

Hope there's someone out there.
Working on my '98 std.  Have 6X6 pipes, which were too damn loud (I would have got a HD if I wanted lots of noise).  Installed 12" baffles.  Much better, but then way too rich.  Fiddled and adjusted (does Honda make those air/fuel mixture screws so hard to adjust deliberately? ) I had to take it back to the shop for a second adjustment.  Now the bike runs much better, but it only starts to stride when I get to turning 2800 rpm.  Here's the question -- will the IS springs improve the low end sluggishness, or should I look at changing out the needles?  The commentary I've read is all to the good but my concern is that my Fat Lady, being a '98, is it a good fit with these springs?

If you change out the needles, your Valk will run lean (not good) because of the 6 by 6 exhaust.
IMHO you either change the exhaust and the needles, or leave it as is.

[berdoobuck]

Hi, Quex -- Yeah, when I put the baffles in the 6X6 the bike really started running rich -- so rich that after 20 or 30 miles the plugs were too loaded to work.  What I'm after is some feedback about putting the IS springs into my carbs.  The posts I've read all seem to be talking about '99 and later.  As I said, with the altered exhaust, my bike won't dial up until I get to about 2800 rpm.  I'm thinking that if I put in the IS springs, I'll have better throttle response at a lower rpm.  Thanks for getting to me about the needles -- I don't think they need changing.  I think if I trim the plug diodes and put in the lighter action springs, the low end performance will improve.  Don't want to open things up if the spring change out won't work on my '98.

[quexpress]

Hi, Quex -- Yeah, when I put the baffles in the 6X6 the bike really started running rich -- so rich that after 20 or 30 miles the plugs were too loaded to work. 

You could lower your needles one notch (leaner) and see if it improves. If not, lower it oner more notch. These Cobra needles are usually set in the middle. You therefore have some play.

What I'm after is some feedback about putting the IS springs into my carbs.  The posts I've read all seem to be talking about '99 and later.  As I said, with the altered exhaust, my bike won't dial up until I get to about 2800 rpm.  I'm thinking that if I put in the IS springs, I'll have better throttle response at a lower rpm.  Thanks for getting to me about the needles -- I don't think they need changing.  I think if I trim the plug diodes and put in the lighter action springs, the low end performance will improve.  Don't want to open things up if the spring change out won't work on my '98.

I/S springs could help getting a quicker response but I believe that you should address the rich condition first.
Hope this helps.

[BnB Tom]

I switched to IS carburetor springs about 40K ago and couldn't tell the difference.   ???   

I switched to IS ICM about 12K ago.  I think I felt a small difference, but it's subtle.   

  Maybe you already HAD Interstate springs and just ended up replacing with different Interstate springs?      

[berdoobuck]

Nothing like I/S on the bile.  I got it from a salvage yard about four years ago and have been earning the savings with my own sweat.  Any case, I did have the bike tuned at the local dealer, so running rich is unlikely.  I'll hold the needle adjustment, and I'll put in the I/S springs.  Take things one at a time: change springs, test drive, pull plugs and inspect, see how it plays out.  I'll leave a post with update.  Thanks guys.