The 2-stroke thread

lol, tons of people think it's a Suzuki.

 

Zuki or not, is that smoker efi?

 

The Yami's are still carb'd

Smokers are like the red headed step child when it comes to R&D

 

It's carbureted.

 

I kinda prefer carb for a 2 stroke, unless the efi system was smart enough to compensate for different oils, oil ratios, etc.

 

Sadly yes, or is it that they are just that simple.... wouldn mind having the throttle control of EFI though.....

What does oil ratio have to do with the computer compensating for fuel air mix? Just wondering what your thoughts are.

 

You would have to program the system for the oil ratio you are going to run. Just like you have to jet the bike now for different oil ratios.

If you run more oil, you will have to up the amount of fuel flowing through the carb or throttle body or you will have a lean condition.

Nothing different from how it currently is. You just would use a laptop instead of pulling the carb apart.

 

I was thinking like the old huskys that didn premix the oil but ran a seperate feed instead for mix oil. A setup like that would then allow the bike to adapt to conditions.

 

You could but it's not needed. There are already aftermarket EFI retrofit kits available for 2 strokes. They work fine with premixed fuel.

Adding oil injection systems bring it's own set of problems. You need a separate oil tank, and an oil pump. They tend to be less consistent, and more prone to failure.

 

Yeah I guess that was my question, how sensitive is the oil ratio with jetting? obviously running more oil causes there to be less fuel in the mix causing a lean condition when compared to the same jetting with less oil but I'm just not sure how lean...

Oil injection systems scare me, my rd350 has one that I'm stupid paranoid about, always checking the hose fittings etc

 

The oil displaces the fuel as you said. How fat you can go is a matter of testing, go up and couple main sizes and hammer it!

Most guys I know with RDs and RZs just premix the fuel and ditched the Oil injection system. But they are all track guys sooo..not so convenient for a daily needing to stop for gas.

 

Just as a point of reference between my KTM and Yamaha 250's. My KTM was setup for 50:1 and the Yamaha 32:1. The KTM was running a 172 main jet and 45 pilot. Yamaha a 180 and 50. Same needle on the middle position and both run the air screw 1 turn out. Both also have the same reed system, same pipe and silencer.

I'm also running VP C8 fuel. If I were running pump gas I would have needed to up the jet size a bit more.

 

Hell yeah 1st place in Nationals, currently in 1st place in the Series!!! I want that #1 plate baaaad.
And I'm doin this shit on a clapped out 2005 YZ250 with a big bore kit, whoopin the 450s and fancy euro 300's...

Senior (40 yrs. & up) “B” - Cumulative Race Times by Place
Place Rider# AMA# NHHA# Rider Name Club Sponsors Brand Lap 1 Lap 2
1 N736 962019 N736 Jason Watson BADGERS Leatt, TBT, Cycle Gear, TUbliss, Dirt Digits
YAM
2:00:21 (2) 3:31:53 (1)
2 N759 819409 Frank Zugovitz
BET
2:00:50 (3) 3:34:16 (2)
3 N188 892751 N188 Scott Aldridge Fly racing, Motoshop, KTM Country
KTM
1:58:38 (1) 3:39:18 (3)
4 N833 1108282 N833 Bruce Tookey
KTM
2:07:42 (4) 3:53:30 (4)
5 O999 810277 Matthew Mcgowen UNITED
KTM
2:13:21 (5) 4:13:30 (5)
6 N859 280532 N859 Carl Westphal JAVELINA RACING, MOTOREX, ONEAL
KTM
2:16:11 (6) 4:14:58 (6)
7 N838 2198214 N838 Tetsunori Sukenobu
HON
2:17:58 (7) 4:15:49 (7)
8 N867 963258 N867 THOMAS HUNDTOFT
KTM
2:19:03 (8) 4:22:54 (8)
9 N843 2202589 N843 Hideyuki Fukuoka
HON
2:27:12 (12) 4:24:59 (9)
10 O13X 911575 Gary Lipczynski JACKRABBITS
YAM
2:24:20 (11) 4:28:56 (10)
11 O34 899007 Bob Boals BADGERSMC
KTM
2:24:14 (10) 4:31:48 (11)
12 N320 920852 N320 Steve Grieb C&D Cycle Center
BET
2:23:36 (9) 4:32:11 (12)
13 O16 3011964 N112 Jason Becker BADGERS 3Bros ktm , Petra Geosciences
KTM
2:33:20 (14) 4:36:40 (13)
14 N113 1107997 N113 Daniel Hamilton
HON
2:29:25 (13) 4:46:40 (14)
15 N821 907626 N821 Garrett Wichmann
KTM
5:24:57 (15)
DNF O17X 1078914 David Scales
HON
3:36:00 (15)
DNF O20 810351 David Tullar SO CAL
YAM
4:09:21 (16)
DNF O104X 910576 O104X Paul Le Tourneur
KAW

DNF N839 2753971 N839 Curt Van Valkenburg
KTM

DNF N857 1092806 N857 Tony Jewell
KTM

 

Congrats!!! That's awesome.

Also thanks for the jetting info guys, it makes sense.

I finally got around to doing the fork seals on the new yz, it was my first time messing with upside down forks, not too bad with the right tools. Pvc seal driver ftw!

 

Congrats Jason thats awesome man!

Watching 2 smoker vids on youtube has me itching for summer time!
https://www.youtube.com/watch?v=-cwImtQw3WA

 

Thanks guys! Mixin gas and haulin ass!! Or tryin to anyway....

 

Congrats man!

 

Thanks guys, so far I am 1st place in the National Series after 2 rounds, 6 more to go!

 

Looks like Chad Reed will be riding a KX250 in the opening ceremonies in Atlanta tomorrow, this week is 90's throwback week for supercross