ALIVE! Started, sounds rough like 3 of 4 cylinders are firing maybe. Then it revved up to 5k as I went for the box fan. I dashed back and flipped the choke on and it really revved 6-7k. Smoke from down under, shut off. (only happened first couple times)
I removed the vac lines 2016 to troubleshoot. All are well plugged to spec. New K&N Air filter, I still have the old one. Carbs rebuilt but not tuned. From seated position left to right, I spec'd temp on the exhaust around 100, 130, 100, 90 Celsius. The video is of the second run, with much the same effect. Throttle cable was too tight, but that's not the issue. Above 2k rpm it hits another level of fire goes to 6k rpm, and it will not return to idle.
START 2: Bike starts up fairly easy. Throttle cable was too tight. No happy medium, it either dies or wants to fire to 5 or 6k. After dropping throttle I was able to drop choke. No smoke out bottom. Sounds rough like 3 of 4 cylinders. This time temps were
130 120 130 110 by memory. The hotter one got cooler.
Order me if wrong...
1. Pull plugs check fouling?
2. Test floats again on bike.
3. Attempt to balance.
4. Air fuel screws only roughed in from soft bottom out.
!ALSO!
ONE of the carbs might still have the broken A/F needle tip from PO in the passageway leading to the throttle valve.
START 3: Ran again with minor adjustment to looser throttle cable and it purred a lil rough at 1k! Gave it gas and it spiked to 6k rpm. Doesn't return after it spikes any of these times and sounds rough. STARTS WITHOUT CHOKE OPEN.
As described above sitting on bike left to right:
93 61 98 90 Celsius
START 4: Adjusted throttle cable. Runs rough 1k rpm, have to hold throttle once a touch warm, okay to 2k rpm then goes haywire and jumps up to 5k 6k rpm. . I know you know what that means, and my searches aren't turning it up.
Now the pipes are more distinct. STARTS WITHOUT CHOKE OPEN
Ride seat left to right
100 50 105 80 Celsius
The 50 corresponds to the carb that had the air fuel needle broken (by PO rebuild ) and down through the passage into the carb butterfly engine side where those 3 little holes emerge on the top of the outlet riiiight where the plate stops. There is a slight impression where it hit on the throttle plate.. I'm thinking it's time to buy a new rack or individual carb for a final rebuild. Is there an efficient way to test this? Open air/fuel screw first?
Thx.
Pulled Spark Plugs
From seated left to right
1. Blackened
2. Cleanest, reads lower temp than others.
3. Browned a bit.
4. Browned a lil.
Start # 6?
Adjusted fuel screws left to right seated on bike:
3/8, 0, 1/8, 1/4 turn in
Temp at shutoff
70, 50, 50, 55 Celsius..
An improvement and it was longer around 2.2k before taking off to 5k 6k rpm. Keep going? Thx.
EDIT: Morning after... reading this article, and here are my notes even though this isn't specifically for CV34. Still searching for the article I found on CV34 rebalance.
www.cycleworld.com/story/bikes/kevin-cam...to-tune-carburetors/
1. Idle screw - general idle from throttle cable
2. Set idle: Air screws (fuel screws on CV34) . My KZ idles semi-well at 1k, so my messing with the screws last night was semi pointless. It takes off at the 2k rpm after some other passage kicks in...
3. Needles on the slides. I think in the rebuild they just screwed in to the plunger, and thus there is no setting of the c-clip to determine height. The article describes this as 1/8 to 1/4 throttle, which may be what takes me to the 2k point and things are good here.
4. Slide - unsure if there are different slides for the CV34, but this and next seems to be where the engine spirals out of control.
5. Checking Mixture on the Needle - unsure where I clipped if there were options on the rebuild kit. I may go dig the old parts out to see. I have to be too rich here. Outta control 5-6krpm,
6 - Needle Jet Tuning - if down to slide needle clip #1 and it could still improve, adjust needle jet. Not here yet.
7. Slow roll tune, Snap response tune, then road testing to see if the Main Jet is proper. I shouldn't need to do any of this adjusting since this is stock.
Alternate tests I might run today is switching the spark plugs of (1&3?) to see if the 50 Celsius exhaust starts firing before chasing other issues. And again, don't forget, I could have a broken fuel needle in carb 2nd from left seated on bike that is still stuck in the passage. Can I borrow a set of carbs?