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It's been awhile since an update.
Carbs took *a lot of work* to disassemble, clean in the dip bucket, scrub, clean in gas, scrub, blow out passageways with compressed air, scrub some more, reassemble, and finally got them back on the bike yesterday afternoon. I had to use the heat gun to soften the intake boots enough and I used a ratchet strap to apply initial pressure to hold the bottom of the carb intake at the bottom of the carb boot. Got the clutch side into the boot pretty quickly by hand, but the other side was fully hanging out and the assy was all cock-eyed. That's when the heat gun came out. I was able to push the last bit by hand and they popped in once the boots were warmed up. That's a good cheat
Downside: I have a overflow on #3 that I'm going to need to strip them off again for that looks like it's draining gas into the oil pan.... Needs an oil change anyway so no big deal. The rebuild kit I bought was kinda meh - https://www.amazon.com/dp/B0D17GK95S Nice that it came with 4 diff sized jets per carb, but I went with the original jets. I used new float seat valves, the float valves, and bowl gasket from each kit - but used the old of most everything else.
The original #40 pilots in the bike were really odd - no hole in the top. Never seen that ever before, ever. None of the original internals had the Mikuni stamping on them, but maybe the nozzle. Cleaned the small pin holes in the sides of the nozzles and pilots and reused them along with the original mains. Used my new brush kit to clean out the mains.
I'd ordered a new throttle cable, but it's way too long at almost 46", prob long by about 10". https://www.amazon.com/dp/B0B3JQJ88C Looking around for the right length for the throttle cable still.
Adjusted the choke rail so that all the choke valves had just the tiniest bit of play so that the valves weren't being pulled out by one actuator (??) that was too tight with the choke all the way off.
I used my fuel bottle hanging from my canopy to fill the short 8" stub of clear fuel line once the carbs were mounted. But, I could see the fuel level slowly sink down, me: that's not good.
Had already checked for spark, but wasn't the best spark I've ever seen. Confirmed that the coils were going to the correct plugs, 1-4 and 2-3. Compression is 140 on the outer cylinders, and 125 in the middle, didn't check clearances on the valves.
I hit the start button and it cranked good with the new battery, but didn't light up. No airbox on it, so I put a shot of ether into each carb and tried again, no joy. Not even close, just cranked, no bark. In my world I'm thinking I should have gotten something at this point if I have fuel, compression, and spark.
So I'm thinking ignition right now.
Action items:
- Grabbing 4 new NGK B8ES plugs today to replace the whatever-Tiger branded cheapo plugs are on it now, and gap them correctly at 0.6-0.8 mm
- Read the coils out with the meter to make sure they are in spec
- Check that the timing mark lines up, read the service manual or maybe basscliff
- There was a CDI test somewhere on here that I recall reading that I could use now, if someone has a link to that I'd appreciate it so that I can ensure that it is working correctly
- Put a timing light on each plug wire just to be sure I'm getting flashing from each out of the coils
- Assume nothing was done right on this before I drove it home/question everything, and assume that it was not running and parked due to sketch maintenance that left it inop
I'm back to Houston for a few months this Friday, and I really want this thing running before I go. But starting to feel really jammed up for time.
Carbs took *a lot of work* to disassemble, clean in the dip bucket, scrub, clean in gas, scrub, blow out passageways with compressed air, scrub some more, reassemble, and finally got them back on the bike yesterday afternoon. I had to use the heat gun to soften the intake boots enough and I used a ratchet strap to apply initial pressure to hold the bottom of the carb intake at the bottom of the carb boot. Got the clutch side into the boot pretty quickly by hand, but the other side was fully hanging out and the assy was all cock-eyed. That's when the heat gun came out. I was able to push the last bit by hand and they popped in once the boots were warmed up. That's a good cheat
Downside: I have a overflow on #3 that I'm going to need to strip them off again for that looks like it's draining gas into the oil pan.... Needs an oil change anyway so no big deal. The rebuild kit I bought was kinda meh - https://www.amazon.com/dp/B0D17GK95S Nice that it came with 4 diff sized jets per carb, but I went with the original jets. I used new float seat valves, the float valves, and bowl gasket from each kit - but used the old of most everything else.
The original #40 pilots in the bike were really odd - no hole in the top. Never seen that ever before, ever. None of the original internals had the Mikuni stamping on them, but maybe the nozzle. Cleaned the small pin holes in the sides of the nozzles and pilots and reused them along with the original mains. Used my new brush kit to clean out the mains.
I'd ordered a new throttle cable, but it's way too long at almost 46", prob long by about 10". https://www.amazon.com/dp/B0B3JQJ88C Looking around for the right length for the throttle cable still.
Adjusted the choke rail so that all the choke valves had just the tiniest bit of play so that the valves weren't being pulled out by one actuator (??) that was too tight with the choke all the way off.
I used my fuel bottle hanging from my canopy to fill the short 8" stub of clear fuel line once the carbs were mounted. But, I could see the fuel level slowly sink down, me: that's not good.
Had already checked for spark, but wasn't the best spark I've ever seen. Confirmed that the coils were going to the correct plugs, 1-4 and 2-3. Compression is 140 on the outer cylinders, and 125 in the middle, didn't check clearances on the valves.
I hit the start button and it cranked good with the new battery, but didn't light up. No airbox on it, so I put a shot of ether into each carb and tried again, no joy. Not even close, just cranked, no bark. In my world I'm thinking I should have gotten something at this point if I have fuel, compression, and spark.
So I'm thinking ignition right now.
Action items:
- Grabbing 4 new NGK B8ES plugs today to replace the whatever-Tiger branded cheapo plugs are on it now, and gap them correctly at 0.6-0.8 mm
- Read the coils out with the meter to make sure they are in spec
- Check that the timing mark lines up, read the service manual or maybe basscliff
- There was a CDI test somewhere on here that I recall reading that I could use now, if someone has a link to that I'd appreciate it so that I can ensure that it is working correctly
- Put a timing light on each plug wire just to be sure I'm getting flashing from each out of the coils
- Assume nothing was done right on this before I drove it home/question everything, and assume that it was not running and parked due to sketch maintenance that left it inop
I'm back to Houston for a few months this Friday, and I really want this thing running before I go. But starting to feel really jammed up for time.
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