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Jet Sizes

  • Thread starter Thread starter Staninator
  • Start date Start date
S

Staninator

Guest
Aloha gents,

I've installed a stage tres dynojet kit on the horse but I'm curious if I should insert the 155 or 160 main jet? Dynojet states that for a stock exhaust with pod filters 155 should be okay but with any aftermarket headers or slip on, you should use the 160. Anyone had any issues with this dilemma?
 
Staninator said:
Aloha gents,

I've installed a stage tres dynojet kit on the horse but I'm curious if I should insert the 155 or 160 main jet? Dynojet states that for a stock exhaust with pod filters 155 should be okay but with any aftermarket headers or slip on, you should use the 160. Anyone had any issues with this dilemma?
Click to expand...

I'm sure before anybody will be able to help you they will want to know what is your exact setup ? (pods, aftermarket exhaust, stock exhaust ... etc)

-Dave
 
5azzmonkey said:
I'm sure before anybody will be able to help you they will want to know what is your exact setup ? (pods, aftermarket exhaust, stock exhaust ... etc)

-Dave
Click to expand...

I have pod filters along with straight pipe exhaust from yeah pair of cylinders.
 
Staninator said:
I have pod filters along with straight pipe exhaust from yeah pair of cylinders.
Click to expand...

why is it a dilemma? go with what DJ says and see how it runs.

you have pods and an aftermarket exhaust, so go with the larger mains, as they instruct.
 
Alright thanks guys! I was just double checking because I was having idle issues initially. I don't want the air to fuel ratio to be crazy.
 
even if DJ recommend those jets it doesn't mean that they will be perfect for your application. you may still have to fiddle about with jet sizes or needle positions to get everything right, but you will be in the ball park to start with, saves having to guess a starting point and spend a fortune on jets.
 
Staninator said:
I have pod filters along with straight pipe exhaust from yeah pair of cylinders.
Click to expand...
A picture is worth a thousand words.
Is this like what you are talking about by straight pipes?

1981_cb750-bobber_dave-jansen.jpg
 
I'll try the 160s first then I'll drop down to the 155s if I lose power. Before I would idle very high (3k) and it wouldn't start up if left sitting for long.
 
Staninator said:
I'll try the 160s first then I'll drop down to the 155s if I lose power. Before I would idle very high (3k) and it wouldn't start up if left sitting for long.
Click to expand...
First of all, main jets have NOTHING to do with starting and idling.

Second, you don't necessarily change jets "because you lose power".
Do measured runs at specific throttle openings (RPM doesn't matter all that much, it's throttle opening), then inspect your plugs.
THEY are the ones that will be the authority on whether you need to re-jet.

.
 
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