I have a 2002 suzuki drz 400 it has spark and fuel but will not start . I checked compression and it has a 120psi . Also looking for a wiring diagram for the bike
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Get yourself some " Contact cleaner" aerosol to clean the contacts in your ignition barrel. Access should be fairly easy if you remove the headlight and fairing. Sounds like you have been in mud or dust, contamination has most likely got into the switch. Check and clean the kill switch on the handlebars while you are at it. Happy Trails!
Low compression will affect the engine's ability to idle. So, check the compression. You need to see at least 140 psi of compression in order for it to idle well. Low compression can be caused by insufficient valve tappet clearance. If the valves are adjusted properely and the compression is still low, then there's internal engine work that needs to be done.
If the compression checks good, then you've either got plugged up jets in the carburetor, or an air leak between the carb and the engine that is preventing it from idling.
Make sure you are using the choke - which is actually not a choke, but a fuel enrichment circuit in the carburetor. The lever is located down on the carburetor. Also, you can try draining the fuel from the carburetor float bowl. Sometimes, just enough water will collect in there to make it difficult to start when cold.
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