Topic: Whaddya think? Plug chop results after rebuild...

[alacrity]

This was a cb550k with a farked piston
Now it has a new top end with 3mm over pistons kit from cruznimage on ebay in japan.
Cylinder block was decked a couple thou at machine shop so there is a teensy weensy increase in compression.
Carpy's 4-1
emgo cheap as dirt pods.
pd46a carbs fully disassembled and refurb'd.
105 main
42 pilot
stock needle in stock position
2 turns out on the magic screw.
bench synched then manometer synched

I had stock airbox and uni filter on it. It was starving for fuel with the stock 90 mains, and I didn't have any sizes till 105, and it was too rich with those and the stock set up. So that's why the pods. Plus, the airbox now makes a supergreat compartment for tools and a lock etc.

She pulls HARD -- like "Holy Crap Batman" hard, right from the bottom.  I'm loving it.  But unlike previous bikes I've done, on this one I can feel the transition between components in the carbs (from pilot to needle especially).

I am getting some intermittent crackle/gurgle sounds and every few mins one little pfft-pop back through an intake. You know what I mean? I hear it on idle and just off idle. It's rare.

Plug-chop done with Engine hot. In fact, earlier in the day it was running what felt like too hot after 20 mins on the freeway.

So my thought is maybe I am running a bit lean in the midrange... like I need to shim up the needles or (somewhere?) find another profile for this setup? Plugs are almost devoid of tan color.

I will follow this with a link to a video of it running.  :-)

[Jerry Rxman Griffin aka MuthaF'er]

Devoid of tan color. Richen until it runs worse and the plugs get dark\wet\foul then fine tune.

[alacrity]

Video of it running - on my tumblr page:

http://feelthemachine.tumblr.com/post/73901177054/77-cb550k-with-3mm-over-pistons-and-a-bump-in

[alacrity]

Oh yeah, and it has the cb650 cam in it!

[goldarrow]

Sounds great!

[alacrity]

Thanks goldarrow. I got it done just in time to miss the vvmc ride this morning.  :-(.  Oh well

And jerry rxman- there is some tan on the plugs just not enough of it.  I think I am gonna go out to the garage and try raising the needles a pinch with shim under


Sent from my iPhone using Tapatalk

[Stev-o]

Sounds awesome!   Makes me wanna change the exhaust on my 550. 

[alacrity]

 .  And that was recoded with the tiny mic on my phone.  I think I will try to do a higher quality recording later this week   

[lucky]

You just can't run pods with the stock needle setting.
Go one step richer.

Remember that the needle controls 1/4 throttle up to 3/4 throttle,
otherwise almost all of your driving.

[alacrity]

yep.
done.
thanks
other probs to chase now... like it never ends.