Currently I have my bike jetted for the 90 degree weather but lately its reaching highs of 50's and maybe 60's. Well my bike has developed idle issues as well as 1/8-1/4 throttle flat spot.
Here's a rundown of what I've got
74 TX 650 motor
Pamco Ignition (original)
Dynatek Coil
NGK plugs w/resistor ends
7mm wires
UNI Pod filters
Straight pipe exhaust
Ignition timing is set to HBB specs
HHB PMA
Jetting is as follows
Main jet 137.5
Pilot is 47.5
Needle is stock
Air screws are turned 3 1/2 turns out from base.
When the weather is warm (80 plus) out the bike runs perfect. No stumbling issue or anything. Plugs look perfect light chocolate brown. As soon as its gone to winter the bike stumbles and hesitates ONLY at idle or off IDLE. As soon as the bikes 1/2 throttle it clears up and takes off. When I pull the choke out while riding the bike the stumble somewhat goes away but does not clear up completely. The bike will not warm up at any point if I don't have the choke out and my hand on the throttle flipping it back and forth.
From everything I've read in the carb tuning guide Im thinking that I need to go larger on my pilot jets. Thing is I am already at 47.5 and I do see that they go up to 60. I currently have some adjustable needles that I have not installed but am out of larger pilots.
Would the consensus be to go larger on the pilot size 52.5~55 and throw the adjustable needles in at the same time?
Thanks in advance, and if Im forgetting something ask away!
Here's a rundown of what I've got
74 TX 650 motor
Pamco Ignition (original)
Dynatek Coil
NGK plugs w/resistor ends
7mm wires
UNI Pod filters
Straight pipe exhaust
Ignition timing is set to HBB specs
HHB PMA
Jetting is as follows
Main jet 137.5
Pilot is 47.5
Needle is stock
Air screws are turned 3 1/2 turns out from base.
When the weather is warm (80 plus) out the bike runs perfect. No stumbling issue or anything. Plugs look perfect light chocolate brown. As soon as its gone to winter the bike stumbles and hesitates ONLY at idle or off IDLE. As soon as the bikes 1/2 throttle it clears up and takes off. When I pull the choke out while riding the bike the stumble somewhat goes away but does not clear up completely. The bike will not warm up at any point if I don't have the choke out and my hand on the throttle flipping it back and forth.
From everything I've read in the carb tuning guide Im thinking that I need to go larger on my pilot jets. Thing is I am already at 47.5 and I do see that they go up to 60. I currently have some adjustable needles that I have not installed but am out of larger pilots.
Would the consensus be to go larger on the pilot size 52.5~55 and throw the adjustable needles in at the same time?
Thanks in advance, and if Im forgetting something ask away!