[stel67]

Bike use to start right up, then added a Flex jet and it refuses to start when cold. Have to open throttle 1/4 turn or more and crank then it will eventually catch. Checked air boot and it is tight, clean Air Filter. Set it to 1 1/2 turns out no change. Also after put in flex jet if I closed jet all the way bike would still run. So I went to the next smaller pilot jet (40) So now have 40 pilot 155 main and JD Blue needle 3rd clip Alt 8500 Ft. The choke when puled does not seem to have any effect on the idle speed. Bike still bogs off line when throttle is pinned. Really not sure what to try next.

[staffy24]

yes after install of my flex jet my bike wont even run?

[crfsonly]

welcome to the site. prior to installing the jd jetting kit how did the bike start and run? if you have to crack the throttle 1/4 of the way to start it then i'd say the pilot is too small not too big.

ken

[stel67]

Bike use to start right up with the old jetting. That was a NCVS in 4th pos 42 Pilot 155 main and standard air screw set at 1 1/2 turns. Then added the flex jet with the same jetting and it was hard as hell to start. After that went to 40 pilot and JD blue needle 3rd clip no change still hard to start. What I do not understand is why when air screw is all the way closed the bike still runs? When I read the jetting section it says if you can screw it all the way in and bike does not die then your pilot is to big? Also bike is bogging off the line would not a larger pilot make that even worse? I do not have the JD instructions so not sure what it calls for as far as jetting at 8500 ft. Any one have set up for the alt handy?

[crfsonly]

Bike use to start right up with the old jetting. That was a NCVS in 4th pos 42 Pilot 155 main and standard air screw set at 1 1/2 turns. Then added the flex jet with the same jetting and it was hard as hell to start. After that went to 40 pilot and JD blue needle 3rd clip no change still hard to start. What I do not understand is why when air screw is all the way closed the bike still runs? When I read the jetting section it says if you can screw it all the way in and bike does not die then your pilot is to big? Also bike is bogging off the line would not a larger pilot make that even worse? I do not have the JD instructions so not sure what it calls for as far as jetting at 8500 ft. Any one have set up for the alt handy?

if it became hard to start after installing the RD fuel screw then you may have gotten something in the fuel screw area. did the o-ring come out without issue and was it replaced correctly? sometimes these o-rings break up and could clog the circuit. there's no reason if installed correctly and at the 1 1/2 to 2 turns out it would make it hard to start with the same jetting.

[stel67]

spent a hour or so working on bike. Took out flex jet o ring looked fine. Put in the stock fuel screw along with 42 pilot. Set fuel screw o 1 1/2 turns out. Would not start. Had to open throttle almost half turn to get it to start. Put in 45 pilot same issue, tried 40 pilot same issue. I am at a loss all I can figure is something got into the fuel screw hole but the rings on the screw both stock and JD look fine. Really regretting buying that Flex Jet bike ran just fine before I installed it. What I do not get is I went back to old set up and still have issue.

[staffy24]

the flex jet may be a coincidence in my case my left inlet is at 0 an i need a valve job

[crfsonly]

definitely not the flex jet...could be related to the installation rather than the product. when you removed the stock fuel screw did you removed the spring, o-ring and washer? was the o-ring in tack or was it torn up? if it was torn up then even the smallest bit of rubber could have traveled into the pilot circuit. check this.

also, are the carb boots on correctly and completely? also, check the hot start cable. this has a tendency when the carb is turned to install jets/fuel screw to pull out and then not be seated completely later.

[stel67]

Both O rings looked fine. Double checked the boots they are good. The more I think about it I am thinking the Hot start may be engaged. I need to check that next. What is the best way to check this? Not really familiar with this.

[crfsonly]

there should only be one o-ring for the fuel screw. for the hot start, check the cable is seated correctly. if you need to inspect you'll have to remove the hot start nut.

ken

[stel67]

When I say both O rings looked ok I meant on the flex jet as well as the stock fuel screw. Thanks or the information

[stel67]

Found the issue left intake was zeroed out, this was the last thing I checked due to the fact that I checked valves 20 hrs ago and they where good...guess when they go they go quick

[crfsonly]

that'll do it. yes, when they start to go they go quickly. you need a valve job.whatever you do, don't get talked into just replacing them without having the valve seats professionally cut. let me know if you have questions about our valve services.

ken