G
gman086
Well-known member
What's the compression? Looking for a 13:1 version in billet (not cheater).
Thanks,
G
Powder addiction Head. Yes or NO
- Thread starter RIZZ
- Start date
What's the compression? Looking for a 13:1 version in billet (not cheater).
Thanks,
G
Got the det light as well, changed back to the E plug, light went out. Had the shop run codes, my resister had failed, 35 dollar test and a 3 dollar part fixed it.
J
joshua335
Well-known member
13:1 cheater
R
racerjb
Well-known member
Yes, I would consider the PA with Clutching to be a good Stage 1 motor mod without the need of doing the pipe and fuel controller. I run the 12.5 head with Fastrax clutching and have been very pleased with the mid range performance. It makes the sled snappier. Like mentioned before there is no top end gain but I do like having the stronger mid range for most all around riding. I felt it made my sled more fun when boondocking, ditch banging those trails into the mountain, wheeling, cookies, short climbs where you need the mid range due to no entry speed, etc.
Only negative I would see is if you have a long warranty and don't want to mess with that. I only had a one year warranty on my 2011 so getting the PA head was a no brainer.
Only negative I would see is if you have a long warranty and don't want to mess with that. I only had a one year warranty on my 2011 so getting the PA head was a no brainer.
I have been increasing the compression on all of my ktm 300 2 strokes for years with awesome results. I am ordering a 13.1 power addiction head from brad for my 13 pro rmk 600. I ride 6-10k and know this will be a great mod in combination with the Carl's clutch kit I got.
i seen a buddy put brads 12.5 head on 2012 rush 800 and nothing else was done to the sled besides some clutching work
and i ran a pcv with clutching work and he couldnt look at me...from the time with started to finish he was behind me the whole way
he was 1-2 lengths behind me....i was not impressed at all,
specially what hp gains he claims to get from it
i was going to order one myself and after seeing this first hand i will not be ordering! best of luck to anyone who orders
not bashing the porduct or brad himself! just giving my 2 cents like everyone else
there is alot more reviews of the head working amazing but i just didnt see it
maybe the 13.1 heads run great but were unable to run them at sea level
i think compression went up 5lbs
and i ran a pcv with clutching work and he couldnt look at me...from the time with started to finish he was behind me the whole way
he was 1-2 lengths behind me....i was not impressed at all,
specially what hp gains he claims to get from it
i was going to order one myself and after seeing this first hand i will not be ordering! best of luck to anyone who orders
not bashing the porduct or brad himself! just giving my 2 cents like everyone else
there is alot more reviews of the head working amazing but i just didnt see it
maybe the 13.1 heads run great but were unable to run them at sea level
i think compression went up 5lbs
F
frog
Well-known member
Cranking compression and compression ratio are two completely different animals. Remember that fuel is your number one enemy. You can run 13.1 at sea level but GOOD 91 octane is a must. Just because the pump says 91 doesn't mean that is what actually is going in the tank. IMO if you want an aftermarket head and you want to "feel" the difference, run a higher compression than pump fuel for your elevation and add enough race fuel accordingly otherwise the gains are minimal for the amount invested.
A few years ago the rule of thumb was:
13.1 0-3K
13.5 3-6K
14.1 6-9K
14.7 9K plus
Now with fuel quality dropping at the pump those numbers still hold true, BUT 1-2 gallons of race fuel is needed in order to keep detonation under control. If no race gas is available or not wanted you need to drop the ratio to:
12.5 0-3K
13.1 3-6K
13.5 6-9K
14.1 9-12K
14.7 12K plus
So far this has worked pretty good as of late.
Also, SOME of the aftermarket head builders for SOME of the manufacturers require a leaner mixture in order for the head to work properly, if the sled is running rich because of a more efficient head performance will be down. The DET threshold will be raised but overall perfromance will be down as well.
Lastly remember that the squish should be measured and followed to the head builders recommended dimensions. Too tight of squish can cause problems and too loose can cause a loss in performance. Not always a bolt on and go.
Holy cow that got long, sorry to drag on.
A few years ago the rule of thumb was:
13.1 0-3K
13.5 3-6K
14.1 6-9K
14.7 9K plus
Now with fuel quality dropping at the pump those numbers still hold true, BUT 1-2 gallons of race fuel is needed in order to keep detonation under control. If no race gas is available or not wanted you need to drop the ratio to:
12.5 0-3K
13.1 3-6K
13.5 6-9K
14.1 9-12K
14.7 12K plus
So far this has worked pretty good as of late.
Also, SOME of the aftermarket head builders for SOME of the manufacturers require a leaner mixture in order for the head to work properly, if the sled is running rich because of a more efficient head performance will be down. The DET threshold will be raised but overall perfromance will be down as well.
Lastly remember that the squish should be measured and followed to the head builders recommended dimensions. Too tight of squish can cause problems and too loose can cause a loss in performance. Not always a bolt on and go.
Holy cow that got long, sorry to drag on.
I am not surprised he did not see much difference with a 12.5 head. Stock is 12.1.
H
High Velocity
Well-known member
I, and a few friends, ran the 13.1:1 PA head on our '12 Pro's last season from 3000-7000 feet with no issues as long as we had honest 91 octane fuel. It definitely made my sled more responsive and pull harder through the midrange. As others have stated, not much extra on the top end. For boondocking, it is a worthwhile mod, IMHO.
Sent from my iPad when I should be fishing.
Sent from my iPad when I should be fishing.
What's the price of a new 13.1 cheater head?
350.00
I am very happy with my 13:1 head and hps can on my assault riding at 3k to 6k. Brad said it will also work well with the fix kit which will be getting installed this yr.
Until your engine goes and leave ring chunks in the head and piston, happened to me but will see what warantee says with stock head back on. I had a 13.1 on and didnt notice any difference with MDS clutching. Thats just me though. It is a nice product and good quality but just not there for me. Going back to stock.
