Yamaha_chop
Fabricator Extraordinare
Hey guys, hoping to get an answer here before the weekend so I can ride again. I got my chopper done and ready in time for the ride last weekend- not without my share of troubles though.
I'll post pictures of the first ride in awhile, but first, here's the backstory. Tried to get the bike running last thursday, was having problems even then. Bike did not want to fire on the left cylinder. Swapped the coil no change, pulled carbs completely apart and cleaned all passageways and blew them out with compressed air, no change. Then I swapped condensers, vroom, fired right up and ran great, Ok cool found it right? Sat. morning comes and I try to fire it up, bam same problem running crappy on left cylinder, mess around with it for awhile, change the ground wire on the condenser to the head, and vroom fires up great. Bike runs fantastic all day, do a few rides.
Sun. I go out to the bike, and it's doing it again! but a little different this time. It'll have trouble running at idle on both cylinders, but once under load the left cylinder kicked in just fine and it rode great. I went to lunch with it, and when I got back I looked it over and the only thing I could find is the crankcase breather tube cap had come off. I have the one with two outlets, so I just capped one off and have a hose running off of the other one. I put a new cap on the one side and it ran perfect again? Craziness i know I can't explain that one at all.
So now it's Sunday afternoon and the bike is running good. I decide to ride with my bro-in-law to a town about 20miles away. Things are going good bike is running perfectly when about 2 miles from our destination the bike backfires and starting running on one cylinder and popping like crazy out the exhaust. Also, my Bro-in-law tells me that just after the backfire the lights all went out.
I get my Dad to load the bike in the back of my truck to take home and look at later. Sure enough all my lights are blown. Guess i used too large of a fuse Anyway, the battery is toast, completely dry. I figure OK new battery, check to see if the voltage is too high and I should be good. I get a new battery and now it's running only on the right side again. Left side will kick in very occasionally, usually just an intermittent backfire every now and then. HOWEVER, now as never before, if I put the choke on, the left cylinder fires right up and the bike revs clean.
It would seem to me that maybe the pilot jet is somehow plugged again or something? I dropped the bowl earlier and everything looked really clean, but tomorrow I'm going to pull the carbs back off and disassemble them again.
I'm kind of frustrated at this point, I really just want to ride this thing, but it seems like I'm having problem after problem.
Pertinent points:
Timing is dead on
Points, coils, condensers are all good.
It definitely seems to be a fuel issue at this point.
BS38 carbs
I believe factory jetting can check tomorrow for sure, but it always ran great before
diaphrams are ok
straight through exhaust
Pod filters
Any questions you have or info you need to know hopefully I'll be able to answer. I'm writing this really late at night so I'm probably forgetting some important point, but anyway....
Thanks for any and all help
Sky
I'll post pictures of the first ride in awhile, but first, here's the backstory. Tried to get the bike running last thursday, was having problems even then. Bike did not want to fire on the left cylinder. Swapped the coil no change, pulled carbs completely apart and cleaned all passageways and blew them out with compressed air, no change. Then I swapped condensers, vroom, fired right up and ran great, Ok cool found it right? Sat. morning comes and I try to fire it up, bam same problem running crappy on left cylinder, mess around with it for awhile, change the ground wire on the condenser to the head, and vroom fires up great. Bike runs fantastic all day, do a few rides.
Sun. I go out to the bike, and it's doing it again! but a little different this time. It'll have trouble running at idle on both cylinders, but once under load the left cylinder kicked in just fine and it rode great. I went to lunch with it, and when I got back I looked it over and the only thing I could find is the crankcase breather tube cap had come off. I have the one with two outlets, so I just capped one off and have a hose running off of the other one. I put a new cap on the one side and it ran perfect again? Craziness i know I can't explain that one at all.
So now it's Sunday afternoon and the bike is running good. I decide to ride with my bro-in-law to a town about 20miles away. Things are going good bike is running perfectly when about 2 miles from our destination the bike backfires and starting running on one cylinder and popping like crazy out the exhaust. Also, my Bro-in-law tells me that just after the backfire the lights all went out.
I get my Dad to load the bike in the back of my truck to take home and look at later. Sure enough all my lights are blown. Guess i used too large of a fuse Anyway, the battery is toast, completely dry. I figure OK new battery, check to see if the voltage is too high and I should be good. I get a new battery and now it's running only on the right side again. Left side will kick in very occasionally, usually just an intermittent backfire every now and then. HOWEVER, now as never before, if I put the choke on, the left cylinder fires right up and the bike revs clean.
It would seem to me that maybe the pilot jet is somehow plugged again or something? I dropped the bowl earlier and everything looked really clean, but tomorrow I'm going to pull the carbs back off and disassemble them again.
I'm kind of frustrated at this point, I really just want to ride this thing, but it seems like I'm having problem after problem.
Pertinent points:
Timing is dead on
Points, coils, condensers are all good.
It definitely seems to be a fuel issue at this point.
BS38 carbs
I believe factory jetting can check tomorrow for sure, but it always ran great before
diaphrams are ok
straight through exhaust
Pod filters
Any questions you have or info you need to know hopefully I'll be able to answer. I'm writing this really late at night so I'm probably forgetting some important point, but anyway....
Thanks for any and all help
Sky