Author Topic: 2104 Grom.. 2t conversion  (Read 6042 times)

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Offline m in sc

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Re: 2104 Grom.. 2t conversion
« Reply #105 on: February 13, 2020, 02:46:27 PM »
so, i finally swapped out the rear sprockets. went from a 35 rear, to a 32, then went to a 30 (the smallest they offer that i can run). its actually a 250 nighthawk (?) rear sprocket because its a 520 chain.  so, the final ratio is the (largest) front sprocket, 14t, and smallest rear, which is 30. thats a 2.14 ratio, which is insane on a bike, usually.

also dropped the main jet one size, which puts it lower than stock on jetting, but my suspicion is the velocity in the intake is so high, its just pulling a lot of fuel. which is ok. I can run it wot and it doesn't run warm and the plug  chops look perfect.

The interesting thing is its so smooth, its -almost- boring, but its overall not. weird.

 :patriot:



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Re: 2104 Grom.. 2t conversion
« Reply #106 on: February 13, 2020, 10:14:56 PM »
It's a elevated 2 stroke stocker!
Way better than a motocross engine....
Can't wait to see it in person at Deals Gap meet, maybe I'll feed Mark too many beers and steal it for a ride>>> :celebrate:

C
RD machine work, boring, porting, cranks and engine building.


Chuck 'SUPERTUNE' Quenzler III
Team Scream Racing LLC
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cqsupertune@tampabay.rr.com

Offline m in sc

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Re: 2104 Grom.. 2t conversion
« Reply #107 on: February 14, 2020, 10:04:19 AM »
Anytime, Chuck.  :clap: :patriot:

Offline Tuck

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Re: 2104 Grom.. 2t conversion
« Reply #108 on: February 14, 2020, 04:02:53 PM »
Nice Job, I bet it's a great wheelie machine. :vroom:

Offline m in sc

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Re: 2104 Grom.. 2t conversion
« Reply #109 on: February 14, 2020, 04:07:27 PM »
Nice Job, I bet it's a great wheelie machine. :vroom:
Thnaks.  oddly, not as much as one would think, which is fine by me. i mean, it will but not unless you want it to or you slam it from gear to gear.
 

Offline Kawtriplefreak

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Re: 2104 Grom.. 2t conversion
« Reply #110 on: February 14, 2020, 06:22:10 PM »
I want to ride it too!! :metal: :metal:

Offline m in sc

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Re: 2104 Grom.. 2t conversion
« Reply #111 on: February 20, 2020, 07:52:28 AM »
small update. fit an in-bar clamp flush water temp gauge from koso.

cleans up the look a bit.





also, did mileage runs monday, this was pretty typical, mixed riding.  31 mpg.





now, just need to mod the spare tank i have for more capacity, and the weather to be better.


Offline SoCal250

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Re: 2104 Grom.. 2t conversion
« Reply #112 on: February 20, 2020, 08:16:21 PM »
79 Yamaha RD400F     77 Yamaha RD400D      91 Yamaha TZR250R
75 Yamaha RD250B     75 Yamaha RD200B (project)
75 Yamaha RD125B     75 Yamaha RD125B (project)
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