820 NOT PUMPING GAS

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Jim Waltz
Posts: 22
Joined: Sat Dec 22, 2007 11:39 pm
Vintage Karting items owned: 60's Nike? 5P700's
2 60's Sears Orange Krates (orig & rest/mod 91A)
64 SAE repro 820's
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Location: Livermore, CA
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820 NOT PUMPING GAS

Post by Jim Waltz » Fri Jan 01, 2010 11:19 pm

Ok guys, I need some help.

I've got a few 820's available to put on my yellow Lotz '64 SAE repro so I can make it to Adams.

So far two of them, an older original West Bend and a newer US Motors, have good spark, good or great compression, will hold 10 psi crankcase pressure and will fire if I prime them. However they won't continue to run.

Appears that gas is not pumping to the carb - even using my KT 100 starter adapted to the PTO with a long hex and a "jam" sockethead cap screw. Engines turn over very quickly with this starter (got tired of the recoil thing) so they ought to pump just like my KT 100's.

I have a nice new E.C. Carbs HL 306B that I have swapped out for the carbs that came on the engines. Makes no difference. Yes, I've double checked reed cage, gasket and carb pulse ports are all on the same side.

I'm very frustrated and don't want to miss Adams.

Anybody got any ideas?
Airborne! 1LT, HHC 101 AVN GP, 101 ABN DIV, RVN 1971

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steveohara
Posts: 411
Joined: Thu Jul 19, 2007 2:29 am
Vintage Karting items owned: 1969 Bug Sprint Mc 91B1
1965 Dart Gran Prix twin Mc100s
1963 Bug Scorpion ESll Mc45

Re: 820 NOT PUMPING GAS

Post by steveohara » Sat Jan 02, 2010 1:31 am

Jim,
You've covered all the normal bases so it is something odd. I love a challenge.
Send it to me and I'll make it run.
Include a return shipping label and there will be no charge.
Steve O'Hara

Gene Luzader
Posts: 62
Joined: Fri Jun 15, 2007 6:04 pm
Vintage Karting items owned: 1963 Simplex Challenger Twin West Bend 820's
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Location: Monroeville, PA

Re: 820 NOT PUMPING GAS

Post by Gene Luzader » Sat Jan 02, 2010 6:38 am

Jim
It sounds like you have the small vacuum hole from the crankcase to the carb blocked.
Check the gasket alighment and hole position.

Gene Luzader
412-824-8234

Rob Voska
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Joined: Fri Jun 15, 2007 9:04 am

Re: 820 NOT PUMPING GAS

Post by Rob Voska » Sat Jan 02, 2010 8:50 am

1. Fuel on?

2. Got fresh gas so oil didn't seperate?

3. Tank outlet plugged?

4. Good fuel line without cracks or leaks?

5. Carb inlet needles stuck? Take off carb top plates and check needle.

6. Check all holes for pulse alignment. Use a wire and check the carb gasket to both the manifold and carb.

7. Check for silicone or something that can swing out of the way of a wire but flex back into position.

8. Make sure plastic carb top has no air leaks. Just hook up a popoff gage and see where carb pops.

You should be able to pull engine over slowly by hand and the fuel should move a inch or so with every revolution.

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