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.28 mac bogger

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kelsco99

Joined: 24 Jun 2009
Posts: 8
Location: Ontario

Posted: Fri Jun 26, 2009 4:34 pm Post subject: .28 mac bogger

i switched the .21 back plate on to the .28 mac.i ran 2 tanks at top speed seems ok.but i still have a slight bog on bottom.lean or rich it bogs slightly.has new clutch to.had a well known engine tuner try to tune it he had same problem.engine is now known as the bogger.thought the pull start leaking was the cause but at least my chassis will be cleaner. is there a known problem?

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kelsco99

Joined: 24 Jun 2009
Posts: 8
Location: Ontario

Posted: Sun Jun 28, 2009 5:38 am Post subject:

im wondering if the pipe is the problem it is an old ofna pipe .21.has good top end.could it bog on bottom with wrong pipe.

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Aron1

Joined: 09 Oct 2007
Posts: 61

Posted: Sun Jul 12, 2009 9:58 pm Post subject:

kelsco99 wrote:

im wondering if the pipe is the problem it is an old ofna pipe .21.has good top end.could it bog on bottom with wrong pipe.

Hi, try to remove one head shim. You will be able to rich a little the top end,
and temp will come down.

Aron

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kelsco99

Joined: 24 Jun 2009
Posts: 8
Location: Ontario

Posted: Sun Oct 04, 2009 3:27 pm Post subject:

it was the pipe old ofna .21

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