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Old 03-14-2013, 01:59 PM   #826
Leydos
2 Stroke
 
Joined: May 2012
Location: Brisbane QLD AU
Oddometer: 13
I run mine at 60:1 high quality synthitic (Motorex)as stated in the Manual, no spooge, no fouled plugs, 100+ hours and still starts first kick and pulls like the it did on day one. I think KTM have enough test data to know what pre-mix works, I find it irritating to ride behind someone running 40:1 on single trail, there is no need to subject fellow riders to a smoke screen just so you can maybe go four seasons without doing the bottom end instead of three.
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Old 03-14-2013, 03:55 PM   #827
DirtJack
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Location: San Antonio, Texas
Oddometer: 797
Quote:
Originally Posted by Leydos View Post
I run mine at 60:1 high quality synthitic (Motorex)as stated in the Manual, no spooge, no fouled plugs, 100+ hours and still starts first kick and pulls like the it did on day one. I think KTM have enough test data to know what pre-mix works, I find it irritating to ride behind someone running 40:1 on single trail, there is no need to subject fellow riders to a smoke screen just so you can maybe go four seasons without doing the bottom end instead of three.
Good advice. What is sometimes forgotten is that 40:1 is actually a leaner fuel mixture than 60:1.
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Old 03-15-2013, 08:46 AM   #828
Lolodesiles
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same as Leydos and no problem at all, almost 200 hrs
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Old 03-15-2013, 08:58 AM   #829
dirtyoffroad
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Location: merrimack,N.H.
Oddometer: 500
Quote:
Originally Posted by DirtJack View Post
Good advice. What is sometimes forgotten is that 40:1 is actually a leaner fuel mixture than 60:1.
how do you figure that?
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Old 03-15-2013, 09:24 AM   #830
ganshert
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Joined: Mar 2005
Location: Colorado
Oddometer: 7,919
Quote:
Originally Posted by dirtyoffroad View Post
how do you figure that?
The more oil in the mix the less fuel therefore 40:1 is leaner than 60:1. Not by much but it is leaner.

three things control air fuel ratio on a 2 stroke instead of just air and fuel on a 4 stroke

oil
air
fuel

We can assume air is constant...

40:1 provides 3.2 ounces of oil and 124.8 ounces of fuel / gallon

60:1 provides 2.1 ounces of oil and 125.9 ounces of fuel / gallon

40:1 is leaner as there is less fuel for the same quantity of air.

The question is what is the effect of a lean state due to more oil. Will the engine run hotter because it's lean or cooler because there's extra oil?
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Old 03-15-2013, 05:08 PM   #831
JohnE65c
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Joined: Mar 2010
Location: Florida
Oddometer: 33
Quote:
Thats good to know thats in there, also how well do these bikes respond to putting along and not killing it all the time, my old yz250 liked to foul plugs?
No problem with fouling at all with my '06 xcw.
I also have a coolant overflow catch tank.
Not sure if it's really needed, since it was on the bike when I bought it, but I never had any boil over issues in the Fl. sand.
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Old 03-17-2013, 07:15 PM   #832
Capt. Egregious
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Joined: Apr 2010
Location: Where the sewer meets the sea, Edmonds Wa
Oddometer: 336
Any of you 300 guy's using cooling fans or see a need to run a fan or overflow tank? I haven't got enough seat time on mine to get a feel for the cooling system.

How about db snorkel? I don't think they are in business anymore but anyone have first hand experience with the that sort of product?
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Old 03-20-2013, 07:15 AM   #833
CO/WV
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back to fuel capicity on my brand new leftover 300 xc. To ride the white rim trail...... 111 miles i will have 50 percent too little or 50 percent too less fuel.
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Old 03-20-2013, 12:11 PM   #834
AMCJEEP
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Joined: Apr 2009
Location: CT
Oddometer: 267
Quote:
Originally Posted by Capt. Egregious View Post
Any of you 300 guy's using cooling fans or see a need to run a fan or overflow tank? I haven't got enough seat time on mine to get a feel for the cooling system.

How about db snorkel? I don't think they are in business anymore but anyone have first hand experience with the that sort of product?
There is a db snorkel on mine. Not really sure of the pros or cons of it. It has been on the bike since I got it from chippertheripper I know he said he wished they still made them for his new 300.

Maybe he will chime in on how well it actually works. I haven't really ridden with any other 2-strokes, and have not tried running the bike with it off to see a difference.

i did find this though
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AMCJEEP screwed with this post 03-20-2013 at 12:16 PM Reason: make more sense
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Old 03-22-2013, 12:54 PM   #835
KingJeff
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Joined: May 2010
Location: Front Range
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97 EXC kickstarter issues

I have a 97 300 EXC that I got last year. We were in Moab last weekend, and all of a sudden I'm getting no friction at all on the kickstarter. I was able to roll-start it down hill to finish the ride, and there was no grinding or weird noise/feel, but now I'm home and ready to figure this out. I'm a novice wrench. Am I getting in over my head on this, or is it not that complicated?
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Old 03-22-2013, 04:14 PM   #836
RideFreak
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Joined: Apr 2009
Location: County Lockup, NM
Oddometer: 4,962
Quote:
Originally Posted by KingJeff View Post
I have a 97 300 EXC that I got last year. We were in Moab last weekend, and all of a sudden I'm getting no friction at all on the kickstarter. I was able to roll-start it down hill to finish the ride, and there was no grinding or weird noise/feel, but now I'm home and ready to figure this out. I'm a novice wrench. Am I getting in over my head on this, or is it not that complicated?
Taking off the sidecover and doing an inspection isn't difficult, the issue will probably be obvious once you have it open.
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Old 03-22-2013, 04:38 PM   #837
KingJeff
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Thanks RideFreak

Thanks! I'm going to pull it apart tonight
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Old 03-27-2013, 06:27 PM   #838
bykpimp
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Joined: Oct 2006
Location: Santa Cruz Ca
Oddometer: 1,408
Quote:
Originally Posted by KingJeff View Post
I have a 97 300 EXC that I got last year. We were in Moab last weekend, and all of a sudden I'm getting no friction at all on the kickstarter. I was able to roll-start it down hill to finish the ride, and there was no grinding or weird noise/feel, but now I'm home and ready to figure this out. I'm a novice wrench. Am I getting in over my head on this, or is it not that complicated?

Replace the top end. Piston, rings, piston pin bearing............. Sneek a peek at the crank while your'e in there.
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Old 04-10-2013, 10:44 PM   #839
Capt. Egregious
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Location: Where the sewer meets the sea, Edmonds Wa
Oddometer: 336
Rode the 300 last weekend at the Desert 100. This bike rocks. Here are afew pics.







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Old 04-10-2013, 10:54 PM   #840
Capt. Egregious
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And a couple more pics just for good measure

The side stand and a bunch of other parts I ordered from KTM Hutt back in February still havent come



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