Magneti Marelli Old topic
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Stage I
Joined: Feb 2023
Posts: 1
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From: Illinois
Magneti Marelli Old topic
Hello all,
I know this topic has been discussed many times, but I can't seem to find the answers to my questions. I have a 2001 Road King Police with the MM fuel injection. It has 43,000 miles and to date it has been working fine. I need to inspect the cam and tensioner as it hasn't been done yet. Thinking of going with the S&S 509 for more low end grunt and putting a 2 into 1 pipe on it. Will it need a tune after or will the MM system handle the change? I hate the thought of having to spend $1000.00 on something like a Thundermax. At that point I may as well do the carb conversion. Also any suggestions on a good 2 into 1 exhaust for a basically stock 88".
Any advice would be appreciated.
I know this topic has been discussed many times, but I can't seem to find the answers to my questions. I have a 2001 Road King Police with the MM fuel injection. It has 43,000 miles and to date it has been working fine. I need to inspect the cam and tensioner as it hasn't been done yet. Thinking of going with the S&S 509 for more low end grunt and putting a 2 into 1 pipe on it. Will it need a tune after or will the MM system handle the change? I hate the thought of having to spend $1000.00 on something like a Thundermax. At that point I may as well do the carb conversion. Also any suggestions on a good 2 into 1 exhaust for a basically stock 88".
Any advice would be appreciated.
Seasoned HDF Member
Joined: May 2017
Posts: 5,915
Likes: 5,929
From: NorCal
Hello all,
I know this topic has been discussed many times, but I can't seem to find the answers to my questions. I have a 2001 Road King Police with the MM fuel injection. It has 43,000 miles and to date it has been working fine. I need to inspect the cam and tensioner as it hasn't been done yet. Thinking of going with the S&S 509 for more low end grunt and putting a 2 into 1 pipe on it. Will it need a tune after or will the MM system handle the change? I hate the thought of having to spend $1000.00 on something like a Thundermax. At that point I may as well do the carb conversion. Also any suggestions on a good 2 into 1 exhaust for a basically stock 88".
Any advice would be appreciated.
I know this topic has been discussed many times, but I can't seem to find the answers to my questions. I have a 2001 Road King Police with the MM fuel injection. It has 43,000 miles and to date it has been working fine. I need to inspect the cam and tensioner as it hasn't been done yet. Thinking of going with the S&S 509 for more low end grunt and putting a 2 into 1 pipe on it. Will it need a tune after or will the MM system handle the change? I hate the thought of having to spend $1000.00 on something like a Thundermax. At that point I may as well do the carb conversion. Also any suggestions on a good 2 into 1 exhaust for a basically stock 88".
Any advice would be appreciated.
Yes, you'll need to tune it to get the most out of your changes. Do your research, there's lots of tuners out there. As for the 2 into 1 exhaust, same. There's lots out there. Personally I'm running V&H Pro Pipe on mine and am very happy with it.
Stellar HDF Member
Joined: Sep 2009
Posts: 2,114
Likes: 666
If you are looking for a great running street bike the 509 and a SuperTrapp 2into1 allows for altering the noise level to meet your desires.
If you are looking for the most power and noise the 509 with a D&D Fatcat or Bassani Roadrage will work good for power.
Regardless, a Power Commander and a proper dyno tune will be necessary to get it right.
Bob
If you are looking for the most power and noise the 509 with a D&D Fatcat or Bassani Roadrage will work good for power.
Regardless, a Power Commander and a proper dyno tune will be necessary to get it right.
Bob
Road Warrior
Joined: Mar 2013
Posts: 1,923
Likes: 587
From: Alorton, Illinois
That is something I would look into before finalizing a plan. Direct Link is what I prefer, but as of Jan 1st. They aren't selling any more licensing. Not saying shops don't have some in stock, but there is no more being made for the states. Power commander is another way, but I don't know if they are even made for MM any more?? S&S had a decent replacement ECM, but that is no more as well. There are stand alone ECU's but that's at least a $3500 option.
Good news. A CV will run that bike just fine.
Good news. A CV will run that bike just fine.
Stellar HDF Member
Joined: Sep 2009
Posts: 2,114
Likes: 666
The best way to make the decision to go carb or stick with the MM system is to decide if you want a guaranteed 1 time cost to convert to carb or to try to find a tuner who really understands the MM system and use a Power Commander (only tuner available) to get the bike to run well.
The downside to sticking with the MM is when and if something goes wrong (dead or bad sensor, or the ECM ***** the bed) it will be exceedingly more difficult to find someone that understands the MM system that will actually spend the time to work with the MM system.
That said I’m referring to modified engines NOT stock-cammed bikes with OEM headers. Those bikes seem easy to get right with minimal understanding.
Hoping this helps your decision making process,
Bob
disclaimer: I am a tuner
The downside to sticking with the MM is when and if something goes wrong (dead or bad sensor, or the ECM ***** the bed) it will be exceedingly more difficult to find someone that understands the MM system that will actually spend the time to work with the MM system.
That said I’m referring to modified engines NOT stock-cammed bikes with OEM headers. Those bikes seem easy to get right with minimal understanding.
Hoping this helps your decision making process,
Bob
disclaimer: I am a tuner
Club Member
Joined: Aug 2007
Posts: 10,393
Likes: 2,060
From: N. Atlanta Burbs
Strange... you don't look like a tuner. 
As far as I know, there are only a few guys to still have MM parts and the knowledge to keep them running. Cole is one of them.
My .02, go carb if you are going to keep the bike for any period of time then enjoy it.
-W
As far as I know, there are only a few guys to still have MM parts and the knowledge to keep them running. Cole is one of them.
My .02, go carb if you are going to keep the bike for any period of time then enjoy it.
-W
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