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Author Topic: Surging  (Read 1089 times)


  • Grand Gearhead
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Re: Surging
« Reply #15 on: November 10, 2012, 08:17:34 PM »
IMHO, (yes i abbreviated!) no cat more soot and vice versa.
My 20p worth.


  • Grand Gearhead
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Re: Surging
« Reply #16 on: November 11, 2012, 01:08:56 AM »
......................with the Hitcock header, EFI Silencer & stock airfilter in place I went for a decent run yesterday with no issues............

Interesting .....  was the K&N one of those POD types that attach to the throttlebody,  or,  an oiled gauze replacement that fits in the stock airbox. ?

There is a whole other thread about the apparent evils of short intakes, the main point being to have a stored volume of filtered air that can readily fill the cylinder during the intake period.
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1971 Triumph Trident
1969 CB450
1966 Sears (puch) 250


  • Grand Gearhead
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Re: Surging
« Reply #17 on: November 11, 2012, 02:28:19 AM »
Hi guys, I have an issue where at approx quarter throttle and with no load on the engine there is surging present, I believe the correct term may be hunting?
Thanks in advance :-\

             Surging is pretty much the correct term for bike engines. Hunting is more what older governor-controlled diesel engines would do when they couldn't get along with their old worn out governors. They would hunt for an RPM where both the throttle & the governor were happy. They'd oscillate up & down x number of rpm never quite being happy with each other.
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Re: Surging
« Reply #18 on: November 11, 2012, 05:14:35 AM »
An oiled gauze replacement that fits in the stock airbox