Question about 2004 Yamaha YZ 250 F

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Is the power of 58 bhp at engine sprocket or wheels...cos it really doesnt seem that much to me...

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Its measured at the flywheel, but then you get losses through transmission, chain wheels etc

Posted on Feb 18, 2009

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Why is my power not going to rear wheel?


Is the rpm up higher for the given speed etc like maybe the clutch id slipping???? OR what are you saying exactly??

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Give the bike a thorough service. These engines are very strong, but as with any engine this can be compromised by bad or missed servicing. The vibration could be any number of things, but check the front wheel bearings and the fork mounts and also the chain and sprockets. if the chain is old it can cause a vibration which would seem as if it is coming from the engine. If you have to change the chain then do the sprockets at the same time. If you fit a new chain to old sprockets it will wear faster and cost more.

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How to inprove engine power by modification of exhaust system in motorcycle


Hi,
Modifying one part of your bike will some effect from another.
If you modify the exhaust system it won't guarantee a bigger additional power, it only just help the exhaust from the engine to go out faster. Become noisy too!
You must modify the piston, carburetor, crankshaft drive gear, and rear wheel gear to have the optimum power advantage you desire for real power from your bikes engine.
May I suggest, instead of the exhaust modification, you should start in the gearing system( crank gear sprocket, rear wheel sprocket, and chain )
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My 2003 sx 250 doesnt seem as power full as it should , you can feel the power there but nothing like my brothers yz 250 it,s like the powerband is only half cutting in or something like that ,,,, 50...


HI. REMOVE THE POWERVALVE COVER ON THE SIDE OF THE CYLINDER.
MAKE SURE THE ARM IS CLIPPED ON TO THE POWER VALVE ITSELF

START YOUR ENGINE AND AS YOU REV YOUR MOTOR YOU SHOULD SEE THE ARM ON THE POWER VALVE MOVE. IF NO MOVEMENT YOU WILL HAVE TO REMOVE THAT SIDE ENGINE CASE AND CHECK CHECK VALVE FUNCTION....CHEERS

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1 Answer

Honda vibrations


This one's a little tricky cause it could be a few things.
I'll try suggestions in the order of probability
  • Worn out chain & sprockets.(Or chain too tight or has a tight spot) Check this by raising the rear wheel off the ground,in neutral & spin the back wheel. If the chain & or sprockets are worn you'll feel it & hear it when you spin the wheel. If it has a tight spot,set the chain tension at the tight spot & lubricate well
  • Loose engine mounting bolts. If loose re- tighten.
  • Worn front sprocket shaft bearing. to check this(if chain seems ok) Remove the chain(note joining link direction of the circlip. The closed end faces the direction of rotation)Bike in neutral, turn the sprocket shaft by hand. It should turn smoothly.If it is notchy thats not good. It is a major job to change & can be expensive(So i hope its the chain &/or sprockets)
  • Broken tooth on a gear in the gearbox. I hope not as again a more difficult & expensive repair.
Hope this helps you narrow down your problem
Regards Andrew Porrelli

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1 Answer

Yamaha Thundercat 600 Drive knocking problem. Jolting/knocking felt throught the footpegs. Does not occur when clutch is in regardless of revs, does not happen when decelerating with throttle closed, seems...


remove the rear wheel & remove the rear sprocket and sprocket hub from rear wheel. (should just pull out) inspect the cush drive rubbers, chanches are they are destroyed & dissinagrated....replace them. check your wheel bearings in hub & sprocket plate.check axle. sprocket teeth & chain...reassemble and go riding..

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1 Answer

Sir, I own a Passion plus Bike 1996 make. 1.What would be the reason If I experience chain sounds-Usually while changing gears? 2.some sort of Shaking Rings noise from Engine , was it really mean that the...


The transmission consists chain sprocket assembly, with the smaller sprocket on the engine & a larger one at the rear wheel. The chain stretches and the sprocket teeh keeps getting worn whenever you accellerate or use the engine as a brake to slow down. This play can increase up to 2 inch,. thus on lower gear, higher mechanical advantage, looses since the sprocket of the engine transfers power after that play/gap/time required to tranfer the same power to the rear sprocket result of metal on metal hammer.
Tighten chain at regular intervals and change the chain sprocket if its still the original one. If the bike runs 50+ km in a day and/or at high speed, change the engine oil every 500 to 750 km running i.e. once a month. Whichever comes first. The oil becomes darker & looses it's viscocity(thin). Also after covering so many kms, if the engine oil had been low for that period & running at a good speed you might require a change of piston rings( 1 oversize) and then filed to fit without jamming the piston.........sodeep

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1 Answer

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Take the wheel off and remove the brake hub. Now clean out all the dirt and mud from riding in the creek and through mud puddles. The brake shaft has dried mud on it and can not rotate freely in the hub. You will probably need a plastic hammer to punch it out of the casing. clean the shaft and the casing hole the shaft goes through. Grease the shaft with waterproof grease.

Please rate this solution. Thanks!

Mar 29, 2009 | Yamaha Ybr 125 Motorcycles

1 Answer

Losing power in last gear


If all other gears are doing okay then I would check with your local dealers parts department and ask the number of teeth on the counter sprocket and on the rear sprocket on a stock dtr 250. The prior owner may have mounted a larger counter sprocket and / or a smaller rear sprocket on the bike. The drive ratio may be out of range such that the engine is trying to make for a really high top speed but just doesn't have the strength to do it.

Please rate this solution. Thanks.

Mar 18, 2009 | 2005 Yamaha DT 125 X

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