Post up what you think are the 'must do' modifications to a Husqvarna 4 stroke dirt bikes and what 'must have' parts should be purchased. It will be assumed that things like jetting do not apply to the EFI bikes, and EFI modifications do not apply to the Keihin bikes.
I'll start. Some of these are going to sound trivial but think they are important.
Summary - Rejet, do the oil changes, and hang on
In order of importance to me.
- Check your air pressure in the tires.
- Oil filters & oil - be warned the first couple of oil changes will have orange flakes & other stuff come out of the engine - that is normal and is why the oil should get changed frequently when the bike is new.
- Read or at least glance at this thread: Important Information
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- Buy an after market fuel screw
- Buy the JD kit - or if you know how to re-jet a Keihin get those parts.
- "Let the stuff fall off the TEs that the TCs don't have", plug the port on the side of the cylinder that a vent hose was attached to, and route vent hoses like any other dirt bike - 2 hoses up under the gas tank, then let 2 hoses dangle along with the spill over hose at the very bottom of the carb.
- Watch these videos if you don't know how -
Remove the throttle stop & enable the AP video and How to re-jet and install fuel screw video
- How to adjust your fuel screw - read this
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- At some point early in the bikes life the valves should be checked - note the feeler gauge should go between the lift arm and top of valve, and NOT the cam shaft/lift arm like the video shows - video
- Consider changing the crossover tube between the radiators that goes over the frame - it may be un-reinforced similar to fuel line. Take it down to the auto parts store to get the correct size radiator hose or some like other types of hoses.
- Consider re-greasing the swing arm & stem bearings just like any other dirt bike.
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Popular optional items
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- Some people buy an extra air filter - I'm lazy and don't like to clean air filters.
- Some people find bark busters like the Cycra Probends to be a good thing - some don't.
- Some people put on carb vent filters which keeps dust out of the carb - a good thing.
- Some people like armor, etc - after market skid plates, radiator guards, pipe heat shields some don't think it is necessary. The bike certainly works well enough without those things until you hit something or burn your pants.
- Some people like larger tanks - but other don't.
- Some people put an after market axle nut on the front axle - again the bike works fine without that but it is a handy thing to have.
- Some people install a "Y" fitting where there is a "T" fitting where the larger radiator hoses come together.
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WARNING - letting these bikes idle in neutral unattended while on the kick stand COULD EASILY result in bike falling down unless auto retract feature is disabled. - Some people dislike the auto retract kickstand - here is one way to disable it:

That list may be updated in the future.
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