Go Back   EcoModder Forum > EcoModding > Motorcycles / Scooters
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 01-24-2012, 08:50 PM   #1 (permalink)
Master EcoModder
 
Join Date: Oct 2011
Location: ellington, ct
Posts: 829
Thanks: 44
Thanked 104 Times in 80 Posts
MC tranny question

There is one thing about sequential trannes that annoys me.

You can't drop one into neutral for EOCing.

Yeah, you can pull in the clutch and coast, but, that's a PITA and not as efficient.

Would it be possible to make a sequential tranny that had a neutral spot on the high side of top gear?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 01-24-2012, 09:04 PM   #2 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,762

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,585
Thanked 3,555 Times in 2,218 Posts
Yes, in fact an early Vetter competitor did that (but on the low side of top gear). Not being as well versed in m/c transmissions, don't ask me how, but it was probably a relatively simple change to that internal gear selector arm/plate/whatchacallit.
__________________


  Reply With Quote
Old 01-24-2012, 09:25 PM   #3 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location: ÿ
Posts: 5,038

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 158
Thanked 269 Times in 212 Posts
There are already detents for neutral and the other gears, it is a ball on a spring riding on a drum of sorts. Trick is figuring out how/where to add more detents so you can feel it with your toe.

Since the bike HAS to fully disengage one gear before engaging another, there is such a position between every gear, but the vetter guy just added one between 4th and 5th (top), perhaps with a dremel and careful analysis and complete disassembly.

I've accidentally found these neutrals many times, especially when learning a new bike.
__________________
WINDMILLS DO NOT WORK THAT WAY!!!
  Reply With Quote
Old 01-26-2012, 03:04 PM   #4 (permalink)
Master EcoModder
 
Join Date: Oct 2011
Location: ellington, ct
Posts: 829
Thanks: 44
Thanked 104 Times in 80 Posts
Yeah, I've found them too, unfortunately.

After a few of those you remember to grab some clutch and wait till the tach dips back down below 10 grand before giving it another click......or you learn how to rebuild trannies.
  Reply With Quote
Old 01-26-2012, 06:04 PM   #5 (permalink)
Master EcoModder
 
Ryland's Avatar
 
Join Date: Jan 2008
Location: Western Wisconsin
Posts: 3,903

honda cb125 - '74 Honda CB 125 S1
90 day: 79.71 mpg (US)

green wedge - '81 Commuter Vehicles Inc. Commuti-Car

Blue VX - '93 Honda Civic VX
Thanks: 867
Thanked 433 Times in 353 Posts
Any reason no to just put a heavy duty free wheel on the motorcycle? seems like it would be easier to do then modifying the transmission.
  Reply With Quote
Old 01-26-2012, 09:04 PM   #6 (permalink)
EcoModding Lurker
 
greenjoe's Avatar
 
Join Date: Dec 2010
Location: Tennessee
Posts: 46
Thanks: 8
Thanked 8 Times in 5 Posts
Right on Ryland, I'm working on one now. It's a one way bearing (sprag) from a yamaha Rhino centrifical clutch. It will free-wheel after throttle decel, and be like nuetral in every gear, I'm pondering now of how to keep it clean & lubed while on the rear wheel??? Most starter clutches from any motorcycle work the same way.
  Reply With Quote
Old 01-27-2012, 06:37 AM   #7 (permalink)
Master EcoModder
 
Join Date: Oct 2011
Location: ellington, ct
Posts: 829
Thanks: 44
Thanked 104 Times in 80 Posts
What about just removing a cog? On a six speed that would mean pulling the 5th gear.
  Reply With Quote
Old 01-27-2012, 06:46 AM   #8 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location: ÿ
Posts: 5,038

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 158
Thanked 269 Times in 212 Posts
Quote:
Originally Posted by pete c View Post
Yeah, I've found them too, unfortunately.

After a few of those you remember to grab some clutch and wait till the tach dips back down below 10 grand before giving it another click......or you learn how to rebuild trannies.
I don't use the clutch when up-shifting, I just learn to be more deliberate on the shift when I unblip the throttle, finding the sweet spot for clean shifts and not bending the shifter forks Never had to rebuild a mcycle tranny.


Quote:
Originally Posted by Ryland View Post
Any reason no to just put a heavy duty free wheel on the motorcycle? seems like it would be easier to do then modifying the transmission.
The mod is actually pretty simple, grind/cut a groove in the shifter detent drum, a dremel and a ruler and a sharpie are the essential tools. If you unscrew the detent ball retainer, you might even be able to do it without much disassembly, but I wouldn't count on it.

Also I would never give up bump start ability willingly. That has saved my butt many times.
__________________
WINDMILLS DO NOT WORK THAT WAY!!!

Last edited by dcb; 01-27-2012 at 06:56 AM..
  Reply With Quote
Old 01-28-2012, 12:19 AM   #9 (permalink)
gil
EcoModding Lurker
 
gil's Avatar
 
Join Date: Aug 2008
Location: Watsonville, CA
Posts: 67

The Drift - '85 Toyota Corolla GTS
90 day: 28.26 mpg (US)

!Rally - '02 Subaru Impreza WRX
90 day: 27.68 mpg (US)

Cinnamon - '13 Honda PCX 150
90 day: 75.86 mpg (US)
Thanks: 62
Thanked 11 Times in 8 Posts
Does anyone here have a picture of where we would need to dremel.
  Reply With Quote
Old 01-28-2012, 01:38 AM   #10 (permalink)
Master EcoModder
 
Join Date: Dec 2011
Location: Boise Idaho
Posts: 842
Thanks: 39
Thanked 89 Times in 69 Posts
look up

slipper clutch
or
sprag clutch

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com