No Gen-3 so I went to the other side
- Thread starter Dennis
- Start date
Cool bike but the tractor in the back ground is more my thing....I'd live on that....
The tractor is very slow, but it does move snow quite well.
The Big Red One
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Man do I love my 2 strokes (and that exhaust smell, especially the bean oil).... I had pretty much every 2 stroke street bike made, and all my dirt bikes were 2 strokes, including my three wheelers and banshee. Only 4 stroke dirt bikes I've owned were dual sports.
Enjoy that smell and powerband
Thanks! This is my first 2-stroke bike so I'm learning about the carb right now. It appears rich and blubbery in the above idle and below 3/4 throttle range. I dropped the needle from the stock #2 to #1 groove last night. I will see if it helped, otherwise I may take it to a local guy that is good at tuning them. The power is really cool, I just need it to run cleaner.Man do I love my 2 strokes (and that exhaust smell, especially the bean oil).... I had pretty much every 2 stroke street bike made, and all my dirt bikes were 2 strokes, including my three wheelers and banshee. Only 4 stroke dirt bikes I've owned were dual sports.
Enjoy that smell and powerband
Tuning 2 strokes can be an ongoing event...
Oiling can be an issue-both the type of oil used and sometimes the oil injector itself as it requires maintenance as well. The older injectors could be adjusted for flow but I'm not certain about the newer ones. Air temperature, elevation, barometric pressure all affect how a 2 stroke runs...
I was fortunate as my late father was a whiz at tuning 2 strokes, he could work magic with them.
Injector? I mix oil and fuel. I understand about changes in weather. Yesterday was low 60's which was pretty warm for this time of year here. I may have to wait another month to really get it tuned. My experience with my buddy last summer was the he didn't change his tune at all over the summer and it worked well enough. That's what I'm hoping to achieve.
I would have thought it was injected....interesting.....
Check your mixture then...if you are off even by a bit, it will drastically affect how the bike runs (and lasts). Too much oil and it runs blubbery and seems to have no snap when you get on it...to few oil will make it run snappy but will cause it to over heat and burn pistons.
What kind of oil are you using?
To be 100% honest, having do deal with my CR250R where I had to mix the gas and oil was a huge PITA after a while...the fuel had to be mixed and used pretty much right away because even fuel evaporation affected the mixture...I had an XR350R at the same time and found myself riding that more and more and eventually getting rid of the CR just because of having to mix fuel.
I'm using Amsoil Dominator at 50:1 as recommended by a few folks, including the local YZ250 expert. My buddy ran that in two KTMs last summer with no issues at all. I just need to get the initial tune closer. Maybe it is now that I adjusted the needle but I haven't tested it yet. I'm waiting on weather at this point. It ran fine at idle and at or above 1/2 throttle. At steady state cruising it was blubbery. It was easy to wheelie in third gear with a crack of the throttle. It is responsive.
pcs
Registered
2 stroke ratio opinions are all over the place and some people lose their minds over this topic. the oem jetting is set up for the oem ratio thats in your owners manual. if u change the ratio of premix the jetting is affected bc you are changing the flow characteristics of the fuel mix. also ratios will vary from different disciplines of motorsports when considering the same engine. mx guys can get away with leaner ratios than desert or sand drag for example. things to consider, gasoline is not a good lubricant, so leaner ratios will reduce piston life if all other variables are the same. also fouled plugs are easier to replace than a top end. im not an expert but have spent enough time on the dyno, desert racing, and sand drag racing atvs to known a thing or 2. good luck.
The Big Red One
Registered
You have the right idea... raising the clip a notch (which drops the needle) will lean it out slightly in the midrange, where you seem to be running rich. Also remember not to over oil your air filter... that will also cause a rich condition. Once I had my bikes jetted right I never changed them for the weather, don't worry too much once you get it running right it'll be fine
You won't have to worry about adjusting valves like your 4 stroke buddies to keep the valve train from self destructing, or oil changes every couple of rides.... just keep the air filter clean and replace the tranny fluid once a year along with the other recommended maintenance and she should last you for ages.
That's one of my favorite things about 2 strokes is the low maintenance
.... that and the addictive hit of power 
Yamaha recommends 30:1 in the manual. I can't imagine the factory jetting with that ratio. Maybe in -1500 DA that would work, but it wasn't right for me. They recommend 15:1 for break-in! The service manager was spot-on. I dropped the clip and it runs much better now. The plug cleaned up from being wet to being dry in the middle, still a little wet around the outside but that will probably clean up as it gets more runtime. The service manager and a few locals say they change the plug at the beginning of the year and don't foul them. I think I'm pretty good right now and am not too concerned about pistons. They are cheap, and eventually that is a good reason to go to the 300 kit ....
Yep, I think I'm good now. The service manager was on the mark. He has owned a lot of them, and races as well. I'm just enjoying my first 2-stroke and a dirt bike with some power. I think the new 2-strokes are pretty good compared to my memories from my youth.You have the right idea... raising the clip a notch (which drops the needle) will lean it out slightly in the midrange, where you seem to be running rich. Also remember not to over oil your air filter... that will also cause a rich condition. Once I had my bikes jetted right I never changed them for the weather, don't worry too much once you get it running right it'll be fine
You won't have to worry about adjusting valves like your 4 stroke buddies to keep the valve train from self destructing, or oil changes every couple of rides.... just keep the air filter clean and replace the tranny fluid once a year along with the other recommended maintenance and she should last you for ages.
That's one of my favorite things about 2 strokes is the low maintenance
A word of advice? Carry a couple plugs and a plug wrench with you....
I'm not sure what you are going to do with this bike but they are pretty high strung and no good at all for trail riding.
I used to do a little moderate trail riding with my CR and it sucked for that. They like to be revved.
LOL I have six of them with my gear. I bought 4 of them before I got the bike then realized I had two on the shelf from a mixed bag of stuff that came with a kid's bike my buddy bought. Our riding is a mix of motocross tracks, ripping around in the woods (lots of on and off throttle) and we do some technical stuff. For sure it won't like the low speed stuff like the KLX did, but I was typically the rider leading us into that. My buddy with the KTM 250SX didn't foul a plug all summer, and neither did his kid on the small KTM. They both ran the Dominator at 50:1 with no issues. I'm just gonna charge ahead and see how it goes. So far really liking the bike, for the hour I have on it.
Sounds like a plan...always good to err on the side of caution and not get stuck in the woods somewhere.
I must have been too gentle with my CR as it fouled plugs quite a bit if I was trail riding. I used Amsoil synthetic and can't remember the ratio I used.
That bike had a DG pipe, Boydson reeds and was punched out with a Wiseco piston....it ripped....almost too much...I had to get rid of it or die on it....
busakiller
Registered
Woot woot. 2 stroke life. Glad to see you converted to the braaap. Bike looks great and Yamaha makes a great bike and the only big 4 that still makes 2 stroke I believe. Rebuild on them is super easy and cheap. Compared to a thumper 4 stroke in the motorcross bikes. It’s nice having a dirt bike for when the weekends don’t turn out to be the best for weather.
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