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Chirping in exhaust #243419
03/16/09 11:08 pm
03/16/09 11:08 pm
Joined: Aug 2001
Posts: 63
Central Ohio
Steve in Ohio Offline OP
BritBike Forum member
Steve in Ohio  Offline OP
BritBike Forum member
Joined: Aug 2001
Posts: 63
Central Ohio
1968 Lightning, new carbs, Boyer, recent rebuild bottom end. The left side has given me problems for a while. It won't idle and there is a popping and chirping from the left exhaust. The right side it fine. I try to start using only the left plug and it won't go. The right side alone is great. I thought air leak for popping, but can't find anything wrong. Any suggestions on where to look?
Thanks in Advance
Steve in Ohio



'68 A65 Bitsa
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Re: Chirping in exhaust [Re: Steve in Ohio] #243464
03/17/09 2:27 am
03/17/09 2:27 am
Joined: Mar 2009
Posts: 7
canada
B
blackfli Offline
BritBike Forum member
blackfli  Offline
BritBike Forum member
B
Joined: Mar 2009
Posts: 7
canada
Check compression on cylinder.If substantially lower than the right,I'd look for either a burned or tight exhaust valve or perhaps a head gasket problem-ya gotta start somewhere.
Glenn

Re: Chirping in exhaust [Re: blackfli] #243469
03/17/09 2:43 am
03/17/09 2:43 am
Joined: Aug 2001
Posts: 4,518
Owego, NY, USA
Mark Z Online content
BritBike Forum member
Mark Z  Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 4,518
Owego, NY, USA
I would first swap the HT leads at the spark plugs. If the problem stays on the same side, you've ruled out ignition. Then swap the carbs. If the problem stays on the same side, then you've ruled out the carbs, and you can turn your attention to the engine.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: Chirping in exhaust [Re: Mark Z] #243473
03/17/09 2:52 am
03/17/09 2:52 am
Joined: Aug 2001
Posts: 3,348
Michigan, USA
BONZO R.I.P. Offline
In Remembrance
BONZO R.I.P.  Offline
In Remembrance
Joined: Aug 2001
Posts: 3,348
Michigan, USA
I'm liking the way Mark Z is thinkin , simple logic will get you through ..

Just a thought , I once saw a beeza with a chirpin sound on one hole and it turned out to be a bad piston ring.

Like Mark , I would gp forth with a leakdown test .

FWIW-BONZO

Re: Chirping in exhaust [Re: BONZO R.I.P.] #243486
03/17/09 5:38 am
03/17/09 5:38 am
Joined: Oct 2008
Posts: 5,166
Gnashville
DavidP Offline

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DavidP  Offline

BritBike Forum member
Joined: Oct 2008
Posts: 5,166
Gnashville
Steve,
Maybe we should put our heads together. All my chirping comes from the right side.
The first thing I found was that idiot former owner had mis-matched throttle slides.
Warm weather has returned. I shall try all Z's suggestions.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
72 T120V cafe project "Mr. Jim"
72 T150V yet to be named

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