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Author Topic: Jet question  (Read 466 times)

Offline DanielK

  • Posts: 57
Jet question
« on: Aug 17, 2018, 08:26:08 »
I tried searching, but failed.
My CB650 has podfilters and missfire at low revs and full throttle. If I drive in 5th in 50 mph and give it full throttle it just gurgles. Shift to 4th and it revs as it should.

Is this to big main jet?


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--Daniel
CB650 -80

Offline focusinprogress

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Re: Jet question
« Reply #1 on: Aug 17, 2018, 09:16:44 »
it could be many things, but do a plug chop at WOT in 5th to see if you're too rich or too lean.
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Offline TheCoffeeGuy

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Re: Jet question
« Reply #2 on: Aug 18, 2018, 09:04:36 »
Typically too small a jet.  What exhaust?   What kind of pods?   Do they have clear passage for the carbs?  On my 850 the only pods that would work are Uniflow.  Eexpensive but they work.  The Emgo and KnN   didnt.

JMO
www.thecoffeeguy.ca Not your ordinary Blog site.

1968 Harley Aermacchi ML 125 Rapido, restored
1972 Honda Cl 450 engine rebuild, a day rider soon, now sold
1980 Suzuki GS850GL Street Brat  My other day bike
2000 Harley 1200 Sport S My day bike
1982 Honda CB650 Chopper light

Offline DanielK

  • Posts: 57
Re: Jet question
« Reply #3 on: Aug 20, 2018, 07:32:57 »
For now emgo pods. Better ones are in the mail. 4-2 exhaust. Not oem. Sito I think.

Path is as clear as it can be:)



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--Daniel
CB650 -80

Online irk miller

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Re: Jet question
« Reply #4 on: Aug 20, 2018, 07:59:35 »
Good chance they could need a bigger jet, but often the case is those style pods are blocking these jets:


Offline DanielK

  • Posts: 57
Re: Jet question
« Reply #5 on: Aug 20, 2018, 13:31:34 »
Good chance they could need a bigger jet, but often the case is those style pods are blocking these jets:
Good input! Which pods are recommended? I have a set of Ramair in it's way to me.
--Daniel
CB650 -80

Offline TheCoffeeGuy

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Re: Jet question
« Reply #6 on: Aug 20, 2018, 14:41:13 »
+1 on Irk Miller
www.thecoffeeguy.ca Not your ordinary Blog site.

1968 Harley Aermacchi ML 125 Rapido, restored
1972 Honda Cl 450 engine rebuild, a day rider soon, now sold
1980 Suzuki GS850GL Street Brat  My other day bike
2000 Harley 1200 Sport S My day bike
1982 Honda CB650 Chopper light

Offline DanielK

  • Posts: 57
Re: Jet question
« Reply #7 on: Aug 26, 2018, 10:07:41 »
Problem solved! It was severe lack of fuel... to small jet AND clogged fuel filter. No I have #120 main jet and free flowing fuel. Runs like a dream! :D
--Daniel
CB650 -80

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Re: Jet question
« Reply #8 on: Aug 26, 2018, 11:49:54 »
Sweet!  Going up on the jet is because of those filters.  Too much air.