“ The loser sees the difficulty in every opportunity…… the winner sees the opportunity in every difficulty”
Think about this at your next mud race…..
“ The loser sees the difficulty in every opportunity…… the winner sees the opportunity in every difficulty”
Think about this at your next mud race…..
Looking for some great video riding tips?
Checkout YOUTUBE and do a search on: Getting Started in Motocross
Changing a tire with Dunlop.
CLICK HERE to see the video.
This is an excellent tip for whenever you’re putting on new grips at the track and don’t have any glue.
Take 4 zip ties and put them inside your grip with the rigid side facing the grip and slick side facing the handlebar. You want one on the top, bottom, left and right all around the inside of the grip.
Then you slide your grip on, once its on simply take a pair of pliers and pull the zip ties out…make sure you have a good bite on the tie and pull slowly so you don’t break it off in there.
Your grip will be on there really tight to say the least, you don’t need to safety wire them, but I do anyway to make me feel better.
The zip ties help the grip go on easy, there is no messy glue and no drying time.
Question:
My bike won’t idle without the choke. Is there any particular reason for this?
Answer:
Your carb meters the fuel to your engine. The carb has three different sub systems:
Pilot Jetting – for up to 1/4 throttle position
Needle Jetting – 1/4 > 3/4 throttle position
Main Jetting – 3/4 > full throttle
These jets allow a fixed amount of fuel, the needle allowing an “operating band” of fuel metering.
To alter the amount of fuel, you can either increase or decrease the orifice (the hole in the jet). This applies to your pilot and main jet.
The needle jet is actually a needle. The fuel first passes through the main jet, then the needle limits the fuel flow (kinda like putting your pinky finger into a garden hose. Water still comes out, just not as much).
The reason your bike won’t idle:
Fuel Screw
The fuel screw allows more fuel through the pilot circuit. This very definitely affects low speed operation. To allow more fuel flow or richen up the bottom end, the fuel screw is turned counter-clockwise (or turned OUT). This IS richening up the bottom end.
To lean it out, the fuel screw must be turned clockwise (or turned in). The problem with this low speed/idle jetting is it is too lean. The only time I think you would turn it in is if you decide to ride your bike into the Rockie Mountains, where bikes are starving for air, which ain’t there!
Pilot Jet
First, your pilot jet is absolutely too small. You need to go up in size. The fuel screw on your carb allows a VARIABLE amount of fuel to pass through the pilot jet. This fuel screw WILL ABSOLUTELY affect your idle. The fuel screw has a spring behind it that allows you to turn it without it falling out of your carb. Turning it in REDUCES the amount of fuel (leaning the fuel/air mixture) and conversely turning it out INCREASES the amount of fuel (richening the fuel/air mixture). The bike IS starving for fuel at idle because the pilot jet is too small. Regardless of the fuel screw position, your bike NEEDS MORE FUEL. If you end up turning your fuel screw out 3 turns or more, your pilot jet IS TOO SMALL.
Needle Jet
The needle jet can be changed as well, or raised or lowered. Needles vary in diameter, AND taper in size, i.e. the tip of the needle is skinnier than the diameter half way up the needle. So as the needle is being pulled up, the needle gets skinnier. This allows MORE fuel as the needle is raised up via the throttle cable.
There is a clip on the needle that allows you to raise or lower the needle, effectively changing the amount of fuel flowing in this 1/4 > 3/4 throttle position. So, if you move the clip down, this effectively raises the needle. Since the needle is now higher in the carb, and we know the needle is skinnier at the bottom, MORE fuel will pass through in the midrange than before you moved the clip.
As for swapping out the needle, the skinnier the needle, the more fuel allowed into your engine.
Main Jet
At 3/4 throttle and higher, the ONLY thing metering fuel is the main jet. If your bike has problems at wide open throttle, the main jet is your culprit (unless it’s your ignition…???). A larger main allows more fuel.
When you modify your bike, i.e. cut your airbox lid, install a high air flow airfilter, you are changing the amount of air into the engine.
When you install an aftermarket exhaust pipe, more air (exhaust) is coming out of your engine.
In BOTH of these conditions, you MUST increase the fuel going to your engine to offset the air going into (or out of) your engine.
Moving more air means you have to move more fuel.
Elevation & Weather Changes
When there is a change in the weather or riding elevation, the amount of Oxygen or moisture will be the culprit. At higher elevations, there is less O2 available. You will need to jet lean to decrease the amount of fuel to compensate for the lower O2.
If it is humid, there is MORE water in the air, you MAY have to jet lean.
In the winter, bikes run lean. Because of the lower temps and humidity, there is more O2 due to density changes. Your bike will run lean, and you will benefit w/ RICHER jetting.
I hope this helps you understand carbs better.
Of course you could just avoid crashing all to together, but what fun would that be?
Racers! One of the major governing factors in good engine rpm is valve spring tension. To keep valve springs from fading out and lasting longer, try this tip:
At the end of each race day, turn your engine over to top dead center (TDC) on compression stroke this will put your springs in the most relaxed position causing less fatigue and spring sag when sitting over a long period of time.
Just about anyone can master the wheelie if they understand the correct techniques and get a lot of consistent, frequent practice in. Of course the key to mastering the wheelie is balance. There is front to back balance and side to side balance. The front to back balance is controlled with body movement, the throttle and rear brake, even the clutch at first in order to get the front wheel up. Once you have it up in the balance point range, it’s a matter of keeping it there and keeping it straight.
A precise, smoothly operating clutch is a must if you plan to beat your competition to the first turn or from corner to corner. Your clutch assembly houses a number of different components, and the clutch plates (most specifically the fiber plates) take on a lot of wear, especially if you shift like a clumsy gorilla. With a “burnt out” clutch, you may experience a dragging or slipping sensation when exiting corners or launching out of the gate; or your steed may even creep forward despite your clutch lever being pulled to the bars. If this is the case, your rear wheel is spending more time spinning than it is hooking up in the dirt, translating to a valuable loss of momentum. Ready to put the past, and your competition behind you? Pay attention. RECOMMENDED TOOLS: Large Ziploc bag, gear oil, new clutch plates (fiber and metal), 8 and 10mm socket or T-handle wrench, two small picks or flathead screwdrivers, torque wrench, clutch cover gasket
STEP 1:
We recommend pre-soaking your new clutch plates with gear oil to ensure that they’re wet and lubricated before installing them in your bike. The easiest way to accomplish this is to stack your plates together and in order, starting with a fiber plate and alternating with your metal plates (eight fiber and seven metal plates total for a five-speed transmission). If you’re not replacing the metals, no worries, but if you are, stacking them now will save you the hassle later. Once stacked, slide them into a large Ziploc bag and pour the proper weight gear oil on top of them. If you ride and change your clutch frequently enough, it’s not a bad idea to have a spare stack pre-soaked and ready to go for next time.
*Note: Metal plates do not have to be replaced as frequently as the fibers, but if you detect excess wear or discoloring, we recommend changing them.
STEP 2:
With your new plates marinating, wash your bike, if it’s not already clean. Starting with a clean bike is a must, especially in the area surrounding the clutch cover, to prevent dirt from getting into your motor. Next, lean your bike over so that the grip or fork leg on the opposite side of the clutch cover is resting against your stand. To gain easy access for clutch cover removal, use your hands to back bleed your rear brake as shown in the photo. By applying pressure with your palm or thumbs to the caliper, the brake fluid will be forced back in the line, ultimately allowing the pedal to freely drop down and out of the way of the clutch cover.
STEP 3:
When removing the clutch cover bolts with your 8mm, it’s good practice to loosen each bolt evenly to prevent warping in the event that the cover is still hot. With the cover removed, use your 10mm to evenly remove the clutch hub/spring bolts. Once the bolts and springs are pulled out, the hub cover (pressure plate) can be lifted off of the assembly. Now it’s time to remove those old cooked plates, but doing so in one full stack is difficult, so we use a couple of small-blade flathead screwdrivers (small picks also work well) to guide and lift each plate out of the basket separately.
STEP 4:
With the plates now removed, it’s a good idea to inspect the wear on the clutch basket, particularly around the ridges. Worn plates that are left in operation for too long may get sloppy and loose, resulting in clutch basket wear that could ultimately cause clutch slippage.
STEP 5:
Now it’s time to install your new clutch plates. Starting with a fiber, and making sure that each plate has a nice even coat of oil, slide the plate into the basket with either side facing out. The next plate in will be a metal one, and it’s critical that it goes in with the flat, machined surface facing out. Continue this process until the last fiber plate is installed. The height of the stack will be nearly flush with the edge of the basket.
STEP 6:
Finally, place the hub cover (pressure plate) back on top of the basket, install the springs, washers, and bolts, and evenly tighten them in a star pattern until gently snug. Using a torque wrench, torque each bolt to the manufacturer’s spec in the same star pattern, and then reinstall the clutch cover. If your clutch cover gasket is the paper type, replace it with a freshy as well.
Note: Depending upon the level of abuse, it’s a good idea to replace the clutch springs every two to three clutch changes.
Posted: Feb 08, 2008
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