[Brad Clem]

I know I’m late, but I’m interested in a few things if you still got them.

PWK Carb (no pump around)

40mm soft axle

Bead breaker

Motul Oils

bamaclemathotmaildotcom

[Brad Clem]

If you have decent experience working on stuff, you should be able to do this.  Rocky Mountain ATV has a 3 part YouTube video that I used the first time I did it.  You will need a few specialty tools.

Tip: Do not let the transmission fall out or lose order of its parts.

[Brad Clem]

John

The short intake is a GFK.  Is there an advantage to using that vs the other?  I’ve done some driveway testing and it seems to dump fuel into the airbox.  I’ve used the angled intake with the pwk and it works well, but I wondering if its optimal.  You’re using the dellorto pump that doesn’t require a return line?

Matt

I run an open class.  To clarify, I used the PWK in my last test, because I couldn’t get the dellorto to run consistently.  If I run the engine is high rpms in gear on the stand, it does fine.  But if I let off and hit the gas again, it appears there is little fuel in the line.  If I open the choke in time, it won’t die.  I tightened the zip tie and added the plug top as John suggested and it seems better.  My next thought it to move the T closer to the pump as it is currently 3 inches from the carb and may add more reserve fuel.

I’m using an adjustable main jet to get in the ballpark, but have run through static jets as well.  268 atomizer, 55 idle, 22 needle on clip 2.  I’ve moved the standard float up and down without change.

[Brad Clem]

No, I haven’t been able to get out lately.  This weekend or next hopefully.

I can’t get something off my mind and maybe if I mention it here, there is an easy explanation.  The kart came with a dellorto carb with a straight intake.  In the box of misc parts, I find a spare dellorto and an angled intake that has a larger boot (it fits the pwk 38).  Then on the spare engine is another angled intake and notation on both by that it was modified by Super-Dyne (same on the engine).  So, if you’re keeping count, I have 2-38mm intakes, 2-30mm dellorto carbs and 1-30 mm intake.

So my thought is that someone kept whatever carbs were being used for this setup and threw in the 2 dellortos.  I don’t think it is normal to use a pwk for a k9b, so what other ~38 mm carb would have been optimal for a modified k9b?

[Brad Clem]

I configured the fuel delivery as Mr Martin suggested and replaced more line while using the pickup from the Honda.  The AX event Sunday was wet, so I did not get a good full throttle testing application.  I never found a “smoking gun”, but it did not exhibit the issue at hand.

Thank you guys for your help.

[Brad Clem]

That’s a coupler at the bottom of the picture

[Brad Clem]

[quote quote=80769]– Pump-to-carb/return line.[/quote]
Pulse line and feed line (pump to carb) are new.

Pulse fitting appears to be ok.

2 sets of reeds and cages have been in it.

Fuel pump is new.

No static restriction.  No apparent dynamic restriction.

Left or right, it does not discriminate.

Output fuel line had a Y that fed carb and return, while blocking the other port at the pump.  I put a new pump on and re-routed pickup in, return out, carb out.

The pickup tube was hardened and would not come off either end.  I just now put the one from the Honda on it (replace with known good) and will test at an autocross on Sunday.
Thanks for all the replys.

 

[Brad Clem]

I see that you are maximizing volume on the carb side of the pump.  I will reroute as you suggest.  I have a filter on the feed line to the pump.  Would this cause a loss of pressure?  Should I move it to the return line to increase fuel pressure fed to the carb?  Then change the carb screen more often.

[Brad Clem]

Confirmed pickup tube is clear, no cracks in the line.  Vent is open.

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