Title Edit: Serious Starting Issue (with audio)

[kml.krk]

I think the noise you're describing is just back firing out of the carb. Generally caused by a lean condition but the choke part doesn't make sense.....I see you rejetted, but what about the mixture screws? And maybe your choke cable needs adjusted a little- it may literary be starving the engine for air.

Fwiw, I'm not doubting you or your dad.

I have mixture screws at 3 turns out so mixture should be fine.

How should I adjust the choke? Should I adjust it in a way that max choke applied after adjustment is about 3/4 of what is now? Or the other way around so I can apply even more choke? (Logically thinking I would want to apply less since I am starving the engine for air, but I no longer know what is logical and what not  )

[mister]

I no longer know what is logical and what not  )

You haven't been speaking to government employees have you?

Sounds like you need to smoke some DMT to get proper perspective 

Michael

[Jared]

I also noticed that when starting using booster (jump starter) it didn't bang either with coke or with no choke.

I'm pretty sure you have  figured  it out...^^^^ ( but you're probably looking at it too hard...) .Get your fresh new battery in there and let us know what happens.
I have had bad batteries that would hold a "surface" voltage ...come up green on the charger -would even read a good voltage but were junk.

The sharp sound could be  the starter clutch disengaging/engaging  as you run the power down/engine is still turning.You have enough power to turn it over...maybe just enough to keep the starter clutch engaged -power drains enough for the starter rpms to drop...slightly lets off...now there's no load and it spins back up and tries to re-engage the motor that's still spinning.

After it's running- do a compression check if you're worried about valves ( check clearances too )- just to set your mind at ease...but since once it's running- it's fine- I don't think you have a problem there.

[kml.krk]

we checked valves on sat and they're perfect. we jumped the starter, it works excellent.

I am starting to think that there is no real problem = blame the battery.

It just bugs me that the battery passes load test just fine...

anyways, for now I will just start with no choke and wait for my replacement battery.

[Cosimo_Zaretti]

Hey I listened to your starting issue video, then I noticed your Leo Vince soundclip in the relateds.  I found that clip ages ago when I was still picking out a bike, I'm a bit of a fan of that pipe.

[kml.krk]

^^^
Cool!
I love that pipe too.
Sometimes on a quiet mornings it bothers me, but other times I love it.

By the way, problems with starting are gone for now.

1. I THINK that the problem was mostly related to mixture screws being 3.5 turns out, this was too much and bike got flooded during startup (that's why choke was making it even worse)
2. Weak battery didn't help (I got replacement and it spins the motor very well)
3. I also synchronized the carbs just to make sure they are OK
4. It got much warmer

I haven't had any starting issues since then!

Happy riding!