Greetings everyone, I am trying to diagnose some issues my KLR has.
1) Idle is fine but holding higher RPM causes random drops in RPM, also what should I set my bike to idle at? Currently its at 1800 RPM because to my ear that's where it sounded happiest.
2) My Speedo is about 10MPH over my real speed, which is annoying but not critical now that I know that.
3) Bike can be terrible to get started, this is probably because I need to do a valve adjustment though and I plan to do that once I get back from this work trip.
I have a petcock from eagle mike, I also have the choke cable delete. I have cleaned my Jets and they look find, I have also rigorously cleaned the fuel bowl and I do not believe the system is getting clogged. I have adjusted my float to 17.5mm. I think that's about it. OH, I have a cheap eBay coil and CDI box, I am wondering if they could be the culprit, although I have no real reason to suspect them.
Below minimum spec valve tappet clearance can cause Below minimum spec Cold Cranking Compression. Which causes reluctant starting and affects proper carburetion, especially at lower rpms. Normally we should use Full cold start Enrichener and ZERO throttle for cold start up (too many people play with the throttle, which reduces or Defeats the enrichener).
But with minimal or tight valve clearance we can get a little more compression if we intermittently open the throttle while cranking, which may 'light the fire'.
I will ask, 'how did you measure float height of 17.5mm'? With the carb held sideways & gently tilted until the needle just touches the brass seat?
Or with the carburetor completely upside down? With the carb turned completely upside down, the cushion spring in the float needle gets fully compressed by the weight of the float. When the carb is right side up the Fuel Level will be Too Low.
How many turns open is the low speed idle mixture screw? Did you confirm that the 3 tiny little Low Speed Transition holes under the bottom lip of the throttle butterfly plate also flowed aerosol cleaner freely (This is best checked with the mixture screw turned in to zero.)?
With valve clearance near upper specs & CCC between 80-125psi, a clean carb with fuel height near gasket level (+or - .5mm) in float bowl, with mixture screw between 1&3/4 to 2&1/4 turns open, a KLR should idle quite nicely at 1300rpm + or- 100rpm when fully warmed.