Flatspot

[slalombuggy]

Have you tried playing with the accelerator pump cam on the carb? I've been able to get rid of any flat spot by adjusting that even with a 009.

brad

[EVfun]

The W100 cam is the twist here. What works with a stock cam no longer completely applys. Perhaps someome with direct experience with that combo can chime in. It will be best if you outline the rest of the build including the exhaust system.

With a stock engine except for an 009 one of the local old timers told me to solder up the hole in the throttle blade. That would eliminate some unmetered air at low throttle positions. Perhaps that would work on the softness from your extra cam at low rpms.
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[dhumsn]

Glad its a good one. Ill have a lpok at it whem in more tonight. Its never been serviced. Then are you saying the holes on the bitterfly i must close up?

I live in a small town with no real mechanices just new part fittets

[dhumsn]

The build is

Standared heads and pistions

W100 cam and a perfirmence exshoust where all 4 pipes is the same length and no back box in place

[dhumsn]

I sucked bacume advanced it dose not loos power but i dont see the plate move when i suck it bit i dont think ill be ablebto move it with sucking it

[wcfvw69]

[dhumsn]

Yeah it needs a service but in south africa hermanus good luck no real old school mechanices her anymore. Ill youtube how to do it and just pop it on my bakkie on a vacume line ti see if it works good or see if i can find anybody with a test vacume pump like you said. I did put new plugs in she is very happy now jist need a timing light on her for the 7.5 and the i need ti set the carb. Im trying to see if i can get play out of my link pins and king pins now well thats my next step.

Send me your email the ill email you some pics and things of my build

[FreeBug]

For the link pins: first grease them, then tighten them, and check for slop. If it's still there, you'll need to change the bushings.

Saying this because I met I guy who disassembled the things before even trying to tighten them, bushings were fine, much time wasted...

[EVfun]

I can think of a quick vacuum can function test if you have a strobe timing light and a tachometer. Run the engine at 2500 rpm with the vacuum can connected and determine the timing. I find a white grease pencil can make a good temporary mark on the pulley. Then repeat the test with the vacuum line unplugged and capped at the carb. You should show less advance.
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[Cribbs74]

Modifying a Kadron for vacuum is covered in the Kaddyshack tech section. I did it in an hr with some JB weld, drill bit and an old vacuum barb off of a 34-pict3.

I have a 1679, W100 with an SVDA. No flat spots.

Is the flat spot off idle? Or at speed when getting on the gas? If it’s off idle it’s more than likely the distributor, at speed it’s probably the accel pumps.

Ron

[dhumsn]

Gearbox ration? Gearbox number starts with sfas1213

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[modok]

Always complaints with the PICT and flat spots
You never hear any complaints about round spots.

[mark tucker]

many dist inflected flat spots can be covered up with carb work, thats covered up.... and many flat spots inflected by the carb can also be covered up with some dist work... but if you fix both you and your motor will be happyer. also some flat spots can be repaired at the tire stores. but sadly not all.