I recently got a motorcycle it‘s a kawasaki ninja 250 a small bike and I‘m a big guy both height and weight wise I know the bike is way to small for me and once I finish learning to ride the bike I plan on getting something like a yamaha r1 or something similiar to that. Now my problem is that when ever I‘m riding I feel like the rear tire is trying to come out from under me wether I‘m going straight or around a corner although it‘s worst going around a corner does any one know why this might happen? is it because the bike is to small for me and getting an R1 will help or is this common? Any on have any suggestion?
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Being that you stated, you are a big guy, As everyone has suggested first add or check tire pressure. If this does not fix it. Take it back to the dealer and have the service tech. check the alignment of the rear tire to see if they put all the bushings in or if something fell off. It also could be a bad bearing in the read wheel. All three are possible cures to this issue. Moving to a larger bike. Check out these bikes before deciding on one. Also check out the link below for bike stories from the master riders. Touring/sport bikes. BMW 1200, Has electric adjustable windshield, abs brakes, very quiet bike. Honda 1300 w/abs brakes, it's just like the BMW for less money plus a 7.7 gal tank. Triumph Rocket III Classic, great ride. Super Bikes. Suzuki Hayabusa has the fastest bike on the market Yamaha YZF R1 very light bike pretty fast. 998cc. Triumph Daytona 675cc, nice ride, cool sound.
I'm well over 200 lbs, and I've ridden on a bike with half the engine size of your Ninja. And even that tiny CB125 didn't do what you are describing. It definitely sounds like something is wrong back there. I'd first check the condition of the tire and next the condition of the suspension and rear axle. Get this fixed promptly. Learning how to ride a bike is enough trouble without mechanical problems that make the bike unstable. And with an R1, you're likely to have even more trouble keeping the back tire stuck to the pavement with the kind of horsepower that bike has. You may even find the Ninja to be more comfortable - supersport bikes are not exactly built with comfort in mind, while the littlest Ninja can accomodate a surprisingly wide range of riders.
both answers were good, but I need to fill in some gaps. have someone behind you to see if the rear tire is rolling straight. You might get away with tilting it up and spinning the rear tire to see if it is straight, but it's better to have someone behind you. you do not need to be going fast-side street going 10 to 20 MPH will do fine. the tire should be PERFECTLY straight. if it wobbles then it's one of two problems. 1. bent rim (not likely-but possible) 2. look at the axle bolt on the rear tire/wheel. there are marks on the swing arm (that's the thing the axle is bolted to) make sure the bolt is at the same mark on each side. NOW, more than likely it's just a matter of not enough tire pressure. the bike's small--you're big and heavy-so you might need to go over the recommended tire pressure. see what the recommended pressure is-it will give you two pressures more than likely-light load and heavy load-go with heavy load. immediately go out and try it around corners-stay close to home(or whereever you put in the air) you want to do these tests very quickly (you do not want to drive enough to heat the air in the tires-so a couple blocks should tell you if it's right) keep going up on the pressure until the shakes stop. also check chain play-the book should tell you, but it should be around 3/8 play up and down total 7/8 (when the chain is slack-depending on where the rear wheel is the chain will tighten up and loosen up)
