20 Most Recent 2003 Suzuki RM 125 - Page 2 Questions & Answers

throttle cable is either routed wrong or just hanging up or pinched somewhere when installed.

check crank bearings. could be bad,if so it will suck air.

Jet 2 step above standard ex: if you are standard at 110 go to 112.

Air set at 2.1/4 turns from soft seat.

sounds like trash in the carb clogging the main jet

meetering passages are still abstructed need to boil carb in hot water and use carb cleaner and hi pressure air again if air screw are cap on your model find them remove cap and air screw also need cleaning.Mr Cee's cycle and atv repair.

without the parts in front of me i would say IF they look the same they may marry up, rule of thum is only replace cases in pairs.Or could you have the case welded?

side stand switch? dirty fuel /water in tank / carby

Ether a stuck float valve, or a sheared quarter moon key on the magneto/stater. Not enough info

There are basically 3 things needed for an engine to run. 1) good fuel, 2) good compression and 3) a strong spark. If you don't have all three, your bike won't start. When you kick it over, do you get spark? You will need to pull a spark plug and check it...if it looks fouled, either use a fine sandpaper to clean it (for testing) or replace it (recommended). If you aren't getting spark and the plug looks okay, you have to look farther "up the chain" to find the problem...possible bad cable to spark plug? Work your way back. It could also be a bad ground...just some things to look at.

cam chains are normally tensioned automatic so if slack then check its working and all guides ok , if yes replace chain asap !

put a small amount of fuel down plug hole , replace plug and see if it tries to start and if it does then clean the carb and tank and replace the fuel !

is engine 2 or 4 stroke ? 2 stroke then is there a water system as you must drain first then undo bolts ! 4 stroke then same as 2 stroke but then you must tdc cams etc and then remove cams and chain etc then remove head !

what valves

when you select 1st gear it it easy or do you have a slight dragging feel ? can you select 2nd gear before you set off , have you checked adjustment and when was last time clutch replaced or checked for condition ? it is a service item !! P...

Need specialist tools to open forks, best option is to take forks off bike and take them and new springs to a bike shop to have them do it. But why change them, do you have any idea if the new ones will be better for your weight and style of riding?

For checking the ohms you will need the repair manual. Should be there the values and the "how to". First you should ckeck the on/off button to see if him is the fault.If you don't know that you have spark or not you could check that easily. If the bike has starter is better. If not, you will need a second person to kick the bike and another one to watch the sparkplugs. The checking method is next: remove a spark plug and fix it on the engine everywhere you want but be sure that the sparkplug ( the wrench zone ) is on metal surface but the electrode should be in the air ( not touching the engine ). In this time press the starter button if the bike has starter or kick the bike. If in this time you see no spark on the elctrode gap that means the problem is the spark, coil, the ignition coil itself or the wires that power the ignition coil. How to check that? By purchasing the repair manual for you bike.

Start with standard jet which should be 260 for a Mikuni carb

he Tires

• Change your tires to paddle tires or sand tires. These are available at most motorcycle shops or online retailers. These tires enable you to push and stay on top of the sand, giving you traction where normal tires would not work.

The Air Filter

• Use a heavily oiled air filter with a sock protector around the outside. This provides extra protection where fine sand particles could bypass your air filter, and enter your engine causing significant damage. Clean and oil your filter frequently when riding in the sand.

The Fuel Filter

• Use an in-line fuel filter or, if you already have one, change it frequently. This will keep fine debris from the sand from entering the engine through the fuel system.

it may just be dirty carb jets or no fule from the tank getting to the carb if it runs better with the choke on its likly to be jets blocked up