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Author Topic: 4th gear  (Read 433 times)

Offline Chris_248X

  • Posts: 5
4th gear
« on: Aug 16, 2017, 05:31:07 »
Hey all,

I have a 125cc and i just changed my sprockets to a 17 / 34.

I have an issue when i get into 4th i am always under revs. So i lose speed rather than gaining any and the engine does not sound like he is enjoying it...

1st : 35km/h
2nd : 70km/h
3rd : 100km/h
4th: 87km/h

Does anyone have an idea how i can change this ?

For info: stock CDI, OORacing orange performance coil, NGK spark plug, Mikuni carb.


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Offline 1fasgsxr

  • Posts: 1075
Re: 4th gear
« Reply #1 on: Aug 16, 2017, 09:10:03 »
Sounds like you need to change your gearing again. What is stock gearing?

Offline orrible-64

  • Posts: 696
Re: 4th gear
« Reply #2 on: Aug 17, 2017, 04:10:45 »
You are too tall, go back to 16 front


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Offline orrible-64

  • Posts: 696
Re: 4th gear
« Reply #3 on: Aug 17, 2017, 04:12:24 »
You need serious head work and a much better flowing exhaust  and probably quite a few  other mods  before you can go that tall


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Offline orrible-64

  • Posts: 696
4th gear
« Reply #4 on: Aug 17, 2017, 04:24:33 »
I run 17, 34 on the salt but is too tall for my bike on the road and it has many more mods than yours e.g. 150 cc. 15 , 34 would be a good start even. A good exhaust will get the bike going better. Then head work with bigger valves  .


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« Last Edit: Aug 17, 2017, 04:29:20 by orrible-64 »

Offline stroker crazy

  • DTT SUPPORTER
  • *
  • Posts: 3638
  • crazy as a fox
Re: 4th gear
« Reply #5 on: Aug 17, 2017, 06:23:27 »
My 'Ace' runs 17/35 which is perhaps a tad too tall.

And that is with 150cc, better exhaust, carby mods, etc..

Crazy
“Ride like the Wind” W.H.

Offline Sneikz

  • Posts: 183
Re: 4th gear
« Reply #6 on: Aug 18, 2017, 06:14:04 »
Agree with all the above.  Too tall! You're a basketballer!

I currently run 17/38. It would be impossible with standard kit. I have larger carb, better header and exhaust, CDI.

I support increasing front sprocket as this relieves the chain.

I will be swapping out the 38R for a 37R tomorrow lifting the ratio from 2.24 to 2.18.

I'll report back on how it goes. It may be a tad too tall. In which case I will have to loose weight. (Which probably is a good thing)

Anything taller than 2.18 should only be for highly moded or 150cc

Don't forget to check the database sprocket sheet:
https://docs.google.com/spreadsheets/d/1USvziYIyzfyxfZA1YYpQf9eP4djb0GLWbvWcmME88Gk/edit#gid=218053251
« Last Edit: Aug 18, 2017, 07:25:01 by Sneikz »
The Silver Bullet Thread: http://www.dotheton.com/forum/index.php?topic=71205.0
Silver Bullet Pics: https://goo.gl/photos/EXyfM3K42BHp2D6w9
Aces on the net: https://goo.gl/c8QmjP
Silver Bullet mods booklet: https://goo.gl/97mGRI
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Offline 1fasgsxr

  • Posts: 1075
Re: 4th gear
« Reply #7 on: Aug 18, 2017, 08:02:41 »
check out gearingcommander.com it can be helpful.