Jetting Sux!!
Posted: May 20th, 2012, 1:18 pm
I have never been a genius when it comes to jetting.....However my bikes always ran decent enough in the different conditions that I rode that jetting was never really a problem for me. 1 size up or down here or there always got things running good. For my first CR500 though I am not so sure. On the plus side I have really learned alot about jetting.
Here is the issue.
Stock PJ carb and I hope to upgrade to a PWK when I get the funds.
Was running the factory 170 main, 55 slow, stock needle in the 4th, stock slide, air screw 1 1/2 turns out.....blah, blah, blah...
I read somewhere here that the CR500 came jetted fat as a pig from the factory.
At my current level of 4000ft the bike ran like complete ass from zero throttle to full throttle. Not to mention that the bike will start on the first kick with the choke off when dead cold. Sounds Fat!!
Per suggestion from Bob (thanks brother) I dropped the main down to a 162 and the slow to a 52.......Top is way better but not where is should be. Bottom still sucks. Mid is ok.
I ordered a DGN needle as a starting point for the mid.
I plan on dropping the slow jet to a 50 now to see if it cleans up the bottom. As I play with the air screw with the 52, the rpms don't rise up at idle until I'm more than 2 turns out.......I'm guessing still rich on the slow jet.
I'll leave the main alone until I clean up my jetting from closed throttle to 1/4 throttle.
When all is said and done I might be as low as the high 40's on the slow and high 150's on the main with a leaner needle. Does this sound right? Is the jetting really that rich from the factory?
The other 2 problems I have.....No matter how many times I set the float height and check all the parts and areas having to do with float height, the bike while idling will sometimes trickle a little fuel out of the overflow
Is this normal? Because if I am overflowing, that could also be the reason I'm rich down low.
Second, when I pull up on the choke it wont stay engaged.....I don't hear the little click when I pull it up. To choke the bike I have to turn the choke knob as if I were raising the idle to full idle. Is this something I can fix or do I need a new choke/idle plunger?
HELP!!!!
Here is the issue.
Stock PJ carb and I hope to upgrade to a PWK when I get the funds.
Was running the factory 170 main, 55 slow, stock needle in the 4th, stock slide, air screw 1 1/2 turns out.....blah, blah, blah...
I read somewhere here that the CR500 came jetted fat as a pig from the factory.
At my current level of 4000ft the bike ran like complete ass from zero throttle to full throttle. Not to mention that the bike will start on the first kick with the choke off when dead cold. Sounds Fat!!
Per suggestion from Bob (thanks brother) I dropped the main down to a 162 and the slow to a 52.......Top is way better but not where is should be. Bottom still sucks. Mid is ok.
I ordered a DGN needle as a starting point for the mid.
I plan on dropping the slow jet to a 50 now to see if it cleans up the bottom. As I play with the air screw with the 52, the rpms don't rise up at idle until I'm more than 2 turns out.......I'm guessing still rich on the slow jet.
I'll leave the main alone until I clean up my jetting from closed throttle to 1/4 throttle.
When all is said and done I might be as low as the high 40's on the slow and high 150's on the main with a leaner needle. Does this sound right? Is the jetting really that rich from the factory?
The other 2 problems I have.....No matter how many times I set the float height and check all the parts and areas having to do with float height, the bike while idling will sometimes trickle a little fuel out of the overflow
Is this normal? Because if I am overflowing, that could also be the reason I'm rich down low.
Second, when I pull up on the choke it wont stay engaged.....I don't hear the little click when I pull it up. To choke the bike I have to turn the choke knob as if I were raising the idle to full idle. Is this something I can fix or do I need a new choke/idle plunger?
HELP!!!!