What to do first jet the carb or ignition

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soup325

soup325

Member
Dec 11, 2010
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Canberra
coming to the end of a rebuild, I have a new carb (dellorto SHA), and a home built modified ignition circuit. plus a shift kit


do I

A - throw all the new stuff on and try and tune it

B - put the NT carb and stock CDI and change one thing at a time.

C - new Carb with stock CDI on it to see whether I need to go up or down on the jet size. I have 10 spare jets to fit, so I have some adjustment. then change the CDI.

I wish I had an indoor bike trainer as a rolling road for tuning.

I an tending to go with C as I havent played with the timing of the mag.


any more ideas??
 
2door

2door

Moderator
Staff member
Sep 15, 2008
16,302
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Littleton, Colorado
'B' is the correct answer.
Do one thing at a time so you'll have some basis of comparison.
Get it running to your satisfaction then make a change. Once that change has proved beneficial, move on to the next. Unless you know where you're at, you can't know where you're going.
Tom
 
Greg58

Greg58

Well-Known Member
May 1, 2011
5,353
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Newnan,Georgia
As a rule I never change more than one thing at a time, if you do two or three things you don't know which new part or mortification helped.
 
N

nightcruiser

New Member
Mar 25, 2011
1,180
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USA
One thing at a time is the obvious answer. Personally I would start out with my stock/running setup then install the new CDI. Assuming your CDI is proper you should be up and running right away, some test riding would be in order. Once you're used to how she runs with the new CDI I would then change the carb. I figure your gonna have to do some sort of tuning on that carb anyways, so might as well do the tuning while running the ignition circuit that you're gonna end up with.... At least that is my way of thinking... Good Luck with your project!
 
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