Dirt Bike FAQ

Cerbat Motocross Track
Kingman
520-757-7438
Motocross

Canyon Offroad Park
Sun City
623-434-4363
Motocross

ET MotoPark
Queen Creek
480-926-6688
Motocross

Mammoth Motocross Track
Mammoth
520-487-2731
Arenacross

Motoland MX Track
Casa Grande
520-421-1716
Motocross

MotoGrande MX
Casa Grande
602-326-8293
Motocross

Nomads Motocross & ATV Club
Sierra Vista
520-458-5297
Motocross
Quads

Pima Motorsports Raceway
Pima
520-762-8771
Motocross

Speedworld Motocross Park
Surprise
623-546-1206
Motocross

Thrasherland Motocross Park
Glendale
623-877-2361
Motocross

If you are just after trails to ride on type in www.trailsource.com and that will give you trails in the area

Parts are completely unavailable. As in they don't even make any spare parts.

The 200cc bikes don't even have the power of a Honda XR100 that is half the size.

also www.rockmountianatvmc.com cheaper but still good quality

If you want to spend a little more money you can have the flywheel lightened at BBR for a hundred bucks. This will let you motor rev like a 2-stroke and make it pick up RPM's fast. If you do alot of wide open riding, this is the thing to do. "This will take away some of your bottom end."

If you still want more than get a big bore kit. If you do go with the big bore kit thin you will need to go with 26mm carb. The stock carb was not made to handle a bigger bore than stock.
P.S.- It is better to buy a complete kit than have the stock cyl. bore. Watch e-bay for these items and do not buy a china knock-off.

Normally,,all those type motors are very easy to start if the engine is in Good Condition,,,or even fair condition.
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Some things that can make them hard to start.

*Low Compression.
That can be caused by several things.
You Really need to have the compression checked with a gauge to determine if it's within proper range.
Should be about 120 psi minimum.

If it's Less than that,nothing will really help much.

"Low Compression" is usually thought to mean "burned-up / wore out Engine",,,,and that's often true.
But not Necessarily.

Valve Clearance Adjustment,,and Timing Chain condition will affect it also and make the compression a bit lower.

>>>Adjust the Valves to .003"
That's Looser than recommended setting of .002".

>>>Make sure the cam chain is adjusted right.
Sometimes the adjuster "sticks" and doesnt really work right.
Also need to check the chain for wear.
Both things are easy to do.

CARBURETOR:
These things are so small even the Tiniest amount of gum/varnish/deposits will make them behave badly.
Easiest thing to do is try some Cleaner added to the Fuel tank.
Use FUEL INJECTION cleaner,,,not "carb cleaner"—it works much better.
Chevron Techron ,,or Seafoam are 2 good ones.
Don't Overdose it thinking that "more is Better".

You may ultimately have to remove the carb and take it apart to clean it.

The Intake Manifold "never" gets loose on original,genuine Hondas.
On all the Clones,,,,it's a crapshoot.
If they Do get loose the Gaskets will leak air,,and cause hard start,bad running.
Or,,if Carb has ever been removed ,,,it's tuff to get them to re-seal without using new gaskets.

Ignition System/Spark Plugs:
Most of the late model versions all have electronic ignitions.
They usually work OK,,,and are Usually NOT adjustable.
When they FAIL,,,almost always it fails like a Light Bulb.
They just Quit Working at all,,,,no mysterious misfires,,no intermittent problems that come & go.

So IF it sparks,,and eventually Runs,,,
there's 99% Odds the CDI Ignition is working OK.

Spark Plugs.
Try an NGK Iridium Plug.
DO NOT expect it to "FIX" anything,,or even Cover-Up any sort of problems elsewhere.
Make sure everything Else is in good order First.

They are NOT Magic Plugs,,,but they DO improve starting because they can fire under a much wider range of conditions,,including Weak Ignition system,,,or partially flooded,,,very cold temps,,,etc,etc

They're expensive ,$8~10.
It Wont FIX anything,,but they can definitely help

Get a Service Manual if you can.

If You cannot find one,,,early Honda 50 & 70 Manual is Close enough to give You general basics

…………………………………………………………..
You will have to register,,but You can get Free Manuals here

http://www.repairmanualclub.com/

These will help.
Remeber,,these are NOT Identical to Yours,,not even the same engines,,70's and 90's are Different.
But they can give you an idea how the things are laid out,,,and valve adjustment,timing chain stuff is basically the same.
Carb Clean/Rebuild PROCEDURE is sorta generic,,,things like that.

Consider them only HINT,CLUE,or GUIDE,,,,and NOT actual,accurate service manuals for Your bike

Honda S90-CL90-C90-CD90-CT90 Shop Manual

Honda SL70, XL70K1 Factory Shop Manual, English

Good Luck with it

KTM has the best suspension, lightest weight, most options and the most power. It is the most expensive and parts can be hard to get. The suspension is great but fussy to adjust.

The Yamaha is great for both racing and trail riding. YZF is better for racing and the WR for trails.

The Suzuki and Kawasaki are about the same and are good for both and they have very tough motors.

The Honda has great suspension and is easy to ride fast but the motors wont last the longest.

BTW, Cycle News sucks and I wouldn't put much trust in what they say. They mostly do street bikes anyway.