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Old 12-28-2003, 7:33 PM   #1
 
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Any 2 stokers out there

Curious as to the premix and ratio you are using. I am purchasing an 87 CR500 next month from a friend and will probably put a new top end in and rebuild the carb so I need to know what you guys recommend. When I had my 86 KTM 500MXC I ran silkolene but times have changed and there may be something comparable or better.
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Old 12-28-2003, 8:02 PM   #2
 
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Re: Any 2 stokers out there

Got yourself a stump puller there eh? Careful with that monster. The oil's out there are all pretty good now adays but people still have their favorites. I myself (and for a few years now) use the Yamaha 2-R for my oil. It does it job but the best part is that I have never had any carbon build up problems. I have yamaha's now but my honda's ran it also. Me,myself and Irene..lol.. love that movie would start at 40:1 mix and go from there. Check the plug for color. Needle adjustment or jetting from there if needed. My.02
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Old 12-28-2003, 11:02 PM   #3
 
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Re: Any 2 stokers out there

32:1 pretty standard for MX bikes. Any modern oil will be fine, find whats available localy. Unless your souping it up, theres probaly no reason to run the best stuff out outhere. Since you asked, I run Castrol A727 in my 2 strokes, but they are high strung GP bikes. My stock 2 strokes I have had good luck with Yamalube 2R as well, and they dye in it makes it easy to remind you that you have premixed your fuel.

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Old 12-29-2003, 12:24 AM   #4
 
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Re: Any 2 stokers out there

Yamalube 2-R @ 32:1 for me too.
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Old 12-29-2003, 9:52 AM   #5
 
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Re: Any 2 stokers out there

Thanks for the input. I'll do some checking today to find the best price in town.
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Old 12-29-2003, 11:44 AM   #6
 
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Re: Any 2 stokers out there

Klotz super techniplate - 32:1. In my old KX500 it was the only oil I used that didn't foul plugs and it smells great, too.

Be careful with that man-eater, by the way. Those old CR5's were monsters. I had an 83 CR480 that was no slouch.
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Old 12-29-2003, 11:52 AM   #7
 
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Re: Any 2 stokers out there

Mobil 1 MX2T in Philips oxygenated race fuel. I like MX2T 'cuz it's fairly cheap (for a quality synthetic), works great, and if you forget to go to the bike shop, you can buy it at an auto parts store on a Sunday on your way to ride. The guys on DRN are really into this combo, and so was I after trying a bunch of different stuff!

Typically around 32:1, although sometimes a little more oil if I want to lean the bike a bit and am too lazy, or don't have a smaller mainjet to put in.
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Old 12-29-2003, 11:59 AM   #8
 
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Re: Any 2 stokers out there

Ive had about 1/2 a dozen motocrossers as well as an RGV and Have used many different oils and I usually just use Castrol TTS, I know its been around for a while and isnt the latest or greatest thing out there but its always easy to get hold of and have never had any problems with any of my bikes! My younger brother has a CR500 at the moment thats has had a bit of engine work done and we just run it at 40:1, The 500 is a big slow reving engine and can handle quiet a lean oil/fuel ratio 50:1 or even leaner shouldnt be a problem (Ive heard of ppl running ratios of up to 100:1 but I wouldnt try it myself )
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Old 12-29-2003, 12:12 PM   #9
 
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Re: Any 2 stokers out there

I don't understand what people hope to gain by leaning down their fuel/oil ratios so much. There were ASME White papers by McCulloch (spelling?) showing how more oil in the mix made more HP in their motors. If you want to research it, dirtrider.net has tons of info on the topic, with the experts all seemed to agree 32:1 or lower was best.

I used to run Blendzol (love that castor smell) in my pre-power valve bikes, and Yamalube R too.
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Old 12-29-2003, 12:22 PM   #10
 
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Re: Any 2 stokers out there

Originally Posted by luvtolean

I used to run Blendzol (love that castor smell) in my pre-power valve bikes, and Yamalube R too.
It's the castor beans in Klotz that makes it smell good, too. That oil mixed in VP C-12 race gas is the sweetest smell there is. It smells like race day.
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Old 12-29-2003, 10:57 PM   #11
 
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Re: Any 2 stokers out there

Originally Posted by luvtolean
I don't understand what people hope to gain by leaning down their fuel/oil ratios so much. There were ASME White papers by McCulloch (spelling?) showing how more oil in the mix made more HP in their motors. If you want to research it, dirtrider.net has tons of info on the topic, with the experts all seemed to agree 32:1 or lower was best.

I used to run Blendzol (love that castor smell) in my pre-power valve bikes, and Yamalube R too.
On air cooled bikes, when we run the Streets of willow in the summer (105+ degrees) the guys will run 18:1, rejetted accordingly, and it makes more power by keeping the motors cooler. I also never understand why people insist on running 40 or 50:1. I rode offroad with an old timer once (he was 72 at the time on a KX500!) and he swore by 50:1 plus an ounce or ounce and a half of Marvel Mystery oil. Said he never had fowled a plug in 50 years. The oil plus MMO probaly put it around 30:1.

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Old 12-30-2003, 12:53 AM   #12
 
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Re: Any 2 stokers out there

Before my water cooled Katoom 500, I had an air cooled 84 YZ490 that I mixed 20:1 since I was in West texas. Never had a fouled plug but I am sure I could have gotten a little more umph out of the beast. That 4 speed tranny wasn't all that bad either. Now a Honda will go into the list of dirt monsters. Hopefully, she has been well taken care of in the past 17 years. I know most of them were sitting in the garage but I don't know how Emery rode it when he did get it out for a spin. I am definitely hoping for more fun than repair work. Seals have a tendecy to go bad just sitting there but he was fairly certain the only things it would need were a new top end and carb cleaning.

I'll post pics when I have her at the house.

Ahhh the smell of Castor...brings back memories even though I never ran the stuff... I can still remember its very distinct aroma.
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Old 12-30-2003, 4:18 AM   #13
 
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Re: Any 2 stokers out there

Originally Posted by Mavic
Before my water cooled Katoom 500, I had an air cooled 84 YZ490 that I mixed 20:1 since I was in West texas. Never had a fouled plug but I am sure I could have gotten a little more umph out of the beast. That 4 speed tranny wasn't all that bad either. Now a Honda will go into the list of dirt monsters. Hopefully, she has been well taken care of in the past 17 years. I know most of them were sitting in the garage but I don't know how Emery rode it when he did get it out for a spin. I am definitely hoping for more fun than repair work. Seals have a tendecy to go bad just sitting there but he was fairly certain the only things it would need were a new top end and carb cleaning.

I'll post pics when I have her at the house.

Ahhh the smell of Castor...brings back memories even though I never ran the stuff... I can still remember its very distinct aroma.
Ist pretty easy to make up a case pressure tester. Not only do seals go bad, but sometimes there is no gasket between the cases, just a sealent that can harden and leak. A flat plate of aluminum cut and drilled to fit over the reed cage opening makes a good blockoff, then pressurize the engine to a couple of psi through the spark plug hole.
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Old 12-30-2003, 8:40 PM   #14
 
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Re: Any 2 stokers out there

Thanks for the info. From what I have heard, 5psi is the starting range with 1psi per minute an acceptable leak rate. You know of any other specs?
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Old 12-30-2003, 9:26 PM   #15
 
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Re: Any 2 stokers out there

Originally Posted by Mavic
Thanks for the info. From what I have heard, 5psi is the starting range with 1psi per minute an acceptable leak rate. You know of any other specs?
5 psi max is what I have heard. Listen for hising sound, and make up a soapy water solution and brush it along the case seams, cylinder to block joint, etc.
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