what is this bike worth?

[pimpchevy07]

yea i bought the cr. it seems pretty clean. it was owned by a guy who owns a streetbike shop. compression seems good but i still plan to rebuild the top end next season. it came with a brand new renthal sprocket set. what is the best chain to get, and how do i know what length to buy?

 

[ketsair]

yea i bought the cr. it seems pretty clean. it was owned by a guy who owns a streetbike shop. compression seems good but i still plan to rebuild the top end next season. it came with a brand new renthal sprocket set. what is the best chain to get, and how do i know what length to buy?

bike shop will have the spec on length, but you'll need a chain breaker, as far as best chain, depends on what you're looking for, free rolling chain (least resistance, roller chain, long lasting & no quite to free rolling, o'ring chain, longest lasting chain, X'ring, you likely won't feel the power difference between any of them till you enter the pro ranks and are pushing the bike to it's limits, but if you buy the cheap roller chain, lube it every ride or it will heat up & stretch, ruining the new sprockets

 

[monsterSJ]

its only worth about $800 on a good day

 

[ANT]

the only reason 2 strokes have to be rebuilt so much is because the lubrication is much poorer compared to a 4 stroke that has dedicated oil passages and lubrication points. the crank basically bathes in oil all the time and the valves/head constantly have oil pumped across their surfaces.

lubrication in a 4stroke motor is superior to a 2stroke that shares its lube with the gas in the same chamber/surface areas.

think about how much oil a 4stroke crank sits in at all times compared to how much oil comes across a 2 stroke crank during extended periods of WFO operation.

hate to break it to you but yamaha's 4-strokes mxer's have such a poor lubrication design for their cranks and top-ends; all they depend on to lube everything is just the crank splashing oil up on everything and thats not enough. All other motors actually have little jet type things in the cases that actually shoot oil up underneath the piston and all over the bearings. I have seen countless yamaha F motors fail because of it. I had a YZ250F and it blew the crank and pistons because of that twice. My buddies yz450f same exact thing, they all blow up the same way. You can search for it too a lot of them blow. The lower rod bearings usually gets trashed and causes the gear on the crank that turns the timing chain to almost sheer which sends more metal shavings everywhere. If you get even more lucky the rod will snap and destroy your cylinder. There are actually aftermarket companies that modify the yamaha cases so that they lubricate the crankshaft and top end more.

i have owned bikes and rode for 7 years. i like 4 stroke bikes, but they are so heavy. i only way 155 so it is much easier for me to rip around a 2 stroke on the track. how do you hone a cylinder?

THe newer four strokes are so light now that the weight doesn't matter. I wiegh 150lbs. and i'm 5' 6" and my ride is an 06' CRF450 and I have no problem handling it. The two stroke you will get tired on faster becuase it takes more work to keep your speed up than it does on a four stroke. You can hone the cylinder in that bike, it is a nikasil bore so don't run out and buy just any hone. The only thing you can use is an Aluminum Oxide 240 grit hone, it is the only hone that wont tear out the nikasil. If you don't want to go that route then you can use 400-600 grit sandpaper just make sure you lube that cylinder up good with some wd-40 or something when your honing it. You want to try to keep the cross-hatching at about a 30 degree angle from horozontal, it's important you do that because that is how your cylinder walls get lubed properly. You don't have to go crazy with the hone just enough to deglaze the cylinder.

 

[ANT]

haha i knew it was a little off topic but when you talked about how they both get lubed that reminded me of that.

 

[stvbird]

I just sold my 1994 KX125 in FL for $1000. It looked like crap, the tires were dry rotted anbd the only thing I can say good about it was that the engine was strong. Someone worked the deal, I just signed the title when $1000 was in my hand. I'd say if a 1999 is any kind of decent, $1500 isn't that bad.

With that said, I will not own another 2 stroke bike or quad, especially a Kawi. I was learning to ride and the power band was so strong, it spun the bike sideways in the air when I jumped in the wrong gear. The landing tore me up.

I find a 4-stroke much more desireable, and when you learn to ride it, it will run just as fast as any 2-stroke (and vice versa).

I had a KX125, Honda XR100, and a Warrior 350. I realize the KX125 was the fastest and hardest to ride, but I absolutly hate the power band on 2-strokes. Hate hate hate. Smooth raw power of a 4-stroker is where it is at. Yup.

Of course you hated the power band on a 2 stroke if you were on a KX125. Ride a GasGas 300 or KTM 300 then see what your think about power band. A four stroke will never lug as low as one of them, and I have a KTM 525 and that sucker is a tractor and it still wont pull as well down low (I mean low low). I sold a 05 KTM 300 smoker and got the 07 525 XCW and miss my 300 2 stroke in a bad way. Besides, modern 4 strokes are disposable. If the motor goes just part it out cause it aint worth fixin.......


Brrraaaapp!!!!

 

[TEEEE]

Of course you hated the power band on a 2 stroke if you were on a KX125. Ride a GasGas 300 or KTM 300 then see what your think about power band.

Thank you! I have a 250 XCW smoker and it rocks (and lugs). Sorta wish I would have gone for the three hundy, but that will be my next bike. Of course, it isn't an MX'er...

 

[Wolf Child]

Thank you! I have a 250 XCW smoker and it rocks (and lugs). Sorta wish I would have gone for the three hundy, but that will be my next bike. Of course, it isn't an MX'er...

You think it lugs now?

Do the SX mod and it will really lug.

I have it done to my 250exc and it's the shizz:brap:

 

[TEEEE]

You think it lugs now?

Do the SX mod and it will really lug.

I have it done to my 250exc and it's the shizz:brap:

Yeah, I've heard of that...right now I just need to get some more seat time on it. Trying to get ready for three races in the next three months, maybe the SX mod over the winter. Need to get my ass out to the garage and fix a leaky countershaft seal right now...

 

[steveyz250fpilot]

and also to find a 250 thumper anywhere near your $ range it would likely be one of the older yz250f's they were not a reliable bike until after a few years mfg, they were an extremely expensive bike to race in the 1st years of their production, my top end maintenance was new rings before every main event, new piston every other ring, was usually approx 10hrs of race/practice time. ALWAYS clean the powervalve train when taking the cylinder off!!! if you're just play riding likely a 250 will go a year before you need anything, unless you play kinda hard

I rode the living shiot out of a 2001 Yamaha 250f (the first year they came out) That was the most reliable bike I ever had. I never had a problem out of that bike.