Lowering bike I'm the proud new owner of a 2001 640 LC4. I have a serious offroad bike (YZ250F) for competition and tough trails. Would like to lower my 640 to make it a bit easier to handle on the road and easier trails I anticipate riding on. I am 6' with a 33 inseam and it's still hard for me to swing a leg over! I have done a fair amount of suspension work and am able to lower the forks and shorten the shock. Main question is

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schwinn 700c trail way Questions & Answers - Fixya

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you sure can. You just need to get one that has the same size diameter steering tube as the one you currently have. You will need some special tools to remove the headset races that are pressed on to the fork and then you can move them to the new fork.

As far as "upgrading" to a longer travel fork, take into consideration that when you do this, you will change the geometry of the bike, effectively "slackening" the head tube angle and they will dramatically affect the steering of the bicycle, it will turn very "sluggishly" and feel like it flops from side to side almost.

Not a big deal if you are on the street, but in a technical offroad situation, this can be a problem if you are not used to the new handling dynamics.

Bicycle frames are literally built around the forks for their handling characteristics. But you say, "I see this done on motorcycles all the time." Yes this is true, but the devil is in the details. On motorcycles a "triple-tree" crown is used and typically the lower tree is machined with the proper offset factored in so that longer forks can be used without lifting the frame and affecting the handling. The one major factor that determines the handling characteristics of two wheeled travel is the measure of the front wheel's "trail". Google it and you will find volumes of information on it and how it is measured. For bicycles there is a "sweet spot" of trail measurement, most manufacturers keep this as a proprietary secret. Before you actually swap out the forks, you can calculate how the longer forks you plan on installing on your bike will affect the trail measurement on your bike to determine if you want to ride the bike this way, before you spend the money. Only you can decide if it is better to save up the money to buy a longer travel bike with the correct geometry or not.

good luck and wear a helmet. More suspension travel just allows you to ride faster off road, so you might be going OTB (over the bars) with the new, longer travel, option. :-)

There are lowering kits available. But, your bike is for use as a competition machine. If it is too big for you then get a smaller bike.If you lower the machine it will no longer function in the way it was designed. In other words it will have less ground clearance, so it is a waste of time having this particular model. If you take some of the padding out of the seat and then recover it that should lower the seat height.

Air to fuel ratio is important to starting and running your bike. A lean condition is when you have too much air for the fuel, this makes HEAT. A rich condition is too much fuel for the air, this FOULS plugs. An easy way to adjust this is to change the clip position on your main jet needle. THis is accessed from the top of the carb. It is mounted in the center of your slide. Try raising your needle position, by LOWERING the C-clip one notch.(lower the clip to raise the needle)(raise the clip to lower the needle) See if it runs better and cooler. if its better, but not perfect, try another notch lower, to raise the needle. Raise needle = richer Lower needle=leaner/hotter. Also check to be sure you have correct gap and heat range for your plug. 0.5-0.6mm gap

it sounds ok-cause more rpm uses more voltage--this bike has a batt coil ign and if batt is low or ded thel be no spark

Sounds like a bad connection to the sever or the game could be scrathed