D&M spike air cleaner jetting?

Energy One
nymikeok

nymikeok

on the back wheel
I installed a Twister on my bike and if you gas it hard it starts popping at about 2500 rpm. if you just slowly roll on it everything is fine. What jets are you guys running in your spike air filtered bikes?
 
T

Thumper169

Well-Known Member
I've got a 31/78 but you have to take into consideration alt. and pipes as well, are you running baffles etc. etc. more info would be better but you can also find plenty of info by doing a search.
 
nymikeok

nymikeok

on the back wheel
no baffles on martin bros trendkills. I tried 31,32,33 and 76,78,80,82 in all the combos. The 33 is the biggest I have in my kit. It seems to fall at the transition circuit.
 
barhopper

barhopper

Another round please
Alot of people(me included) hate the spikes. Not enough air. I cut mine off, slid on a K&N. Works much better.
 
Little-Boo

Little-Boo

Well-Known Member
Troop Supporter
Elevation in my area is about 137 feet almost none. I use the XXX Carb with the 31 and 74 works good for me. :D
 
Raywood

Raywood

The Pirate
Staff member
Calendar Participant
Troop Supporter
nymikeok said:
ANYONE ELSE HAVE ANY INFO???
Click to expand...
What jets do you have in it now? Seems you are putting very large jets in it when you should be using smaller with that restrictive air cleaner cover.

I run a 29.5/74 combo with an exposed cone filter.

Plus your pipes aren't doing you any good either without some kiind of baffles.
Your motor is nothing more than an air pump and if you are running a 33/80 combo then you are just flooding it out.
Go get it dyno'd and have them put in the air/fuel analyzer.

:cheers:
 
kickstart

kickstart

Well-Known Member
Stock motor, 32/78, bowl vent plug removed, mean mothers with baffles, spike mounted Vertical and I'm at sea level.

Runs great and plugs are perfect!
 
Staffy

Staffy

Active Member
Had the D&M - moved back to stock....

Am in NJ - V&H 2-1 pipes, re-jetted to 32 and 80 last Friday and am as happy as ever :) :) ...will check the plugs in a few (may be a touch rich). Just an occasional pop on de-acceleration if any. Just couldn't get it right with the D&M. then again it could be me...

I would try the same combo with the D&M 32-80 make that your base line and then work up or down depending on the outcome.
 
Wildthing

Wildthing

Got Life?
I have the D&M spike with V&H Big radius with baffles.
Sorry but I can't remember my jets but I always have
decibel popping while decelerating. Sometimes when
I start the bike up it makes a loud bang like a 357 magnum.
Any ideas?
 
barhopper

barhopper

Another round please
Wildthing said:
I have the D&M spike with V&H Big radius with baffles.
Sorry but I can't remember my jets but I always have
decibel popping while decelerating. Sometimes when
I start the bike up it makes a loud bang like a 357 magnum.
Any ideas?
Click to expand...
Start by pulling jets and check the sizes. Know all your info first. Have you adjusted the A/F mixture?
 
nymikeok

nymikeok

on the back wheel
I think it is fixed. I went back to some of my old hot rod drag stuff. The s&s has a allen screw to the left side of the throat. pull it out. The carb seems to be vapor locking with the velocity stack. This is an extra bowl vent. It rides strong now.
 
francoblay1

francoblay1

The Spaniard
nymikeok said:
I think it is fixed. I went back to some of my old hot rod drag stuff. The s&s has a allen screw to the left side of the throat. pull it out. The carb seems to be vapor locking with the velocity stack. This is an extra bowl vent. It rides strong now.
Click to expand...
Yup, as is stated by S&S in their Manual... get rid of that Bowl Vent Plug. :up:

32/78 and 60 Air Bleed, @ Sea Level. Spike mounted vertical :2thumbs:

:cheers:
 
Last edited:
HMAN

HMAN

I just like my Freedom
Supporting Member
Stock 107. 32/78. .40 air bleed. MLB twisted pipes no baffles, bowl vent removed, D&M twisted spike mounted forward. I found if I run with the rain sock on, its great. Pull the sock and I get a slight miss at around 60-65.
 
ringo

ringo

Active Member
some people have great success with spikes and others for what ever reason cant make them work. Its like batteries, some people are constantly killing them and others rarely have to change them. I run a xxx mini taz and like Harry, run the rain sock all the time.
 
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