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Author Topic: Motor Mods on 107  (Read 446 times)

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Dr.D

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Motor Mods on 107
« on: January 08, 2019, 05:17:43 PM »

Hello gentlemen,

I's been some time since I was logged on but I need some help from the group. I have an older friend that has purchased a 107 M8 RG and wants to make it more powerful. It is really crazy because he does not even ride very much and he is a bit aged but he has money and wants something. I have looked at the stage kits and they seem a bit biased to the high rpm HP and I am afraid that might not suit him.

What can be done to the 107 to possibly increase displacement and build the low end to midrange power avoiding the need to rev high . He needs smooth strong reliable power with out the big numbers at the top. Can you all advise?

We are willing to do intake, pipes, cams and pistons with a compression increase. Increasing the displacement is not a problem if reliability and nice street manners can be maintained.

Let me hear what you all think?
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Dr.D

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Re: Motor Mods on 107
« Reply #1 on: January 08, 2019, 09:06:32 PM »

Read 28 times and no response?
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FLSTFI Dave

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Re: Motor Mods on 107
« Reply #2 on: January 09, 2019, 08:21:25 AM »

There are several 120 kits on the market for the 107.  You do not have to split the cases, and they yield very good low end torque.
T-man has 120 kits
Suburban Speed has 120 kits
Fuel moto has 120 Kits.

Pretty easy to get the 120 to make 130's for torque.

Woods cam web site has several dyno runs of 120 kits, so does the Fuel moto site.
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Re: Motor Mods on 107
« Reply #3 on: January 09, 2019, 08:43:46 AM »


I would suggest that you first have a discussion with your friend about his feelings concerning warranty, before you spend a lot of time researching various modifications.  If he is concerned about warranty, any engine mods other than the street legal approved kits from Harley will void his powertrain warranty.  If he doesn't care about warranty and is willing to accept the risk, then I'd suggest contacting the companies Dave mentioned in his post.  Most aftermarket companies have offerings for the M8, we just don't seem to hear as much about them as we used to, probably due to the changes for 2017 and up concerning warranty repairs and illegal mods along with all the reports about serious engine failures. 

Jerry
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Dr.D

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Re: Motor Mods on 107
« Reply #4 on: January 09, 2019, 10:42:00 AM »

There are several 120 kits on the market for the 107.  You do not have to split the cases, and they yield very good low end torque.
T-man has 120 kits
Suburban Speed has 120 kits
Fuel moto has 120 Kits.

Pretty easy to get the 120 to make 130's for torque.

Woods cam web site has several dyno runs of 120 kits, so does the Fuel moto site.
Thanks. I have done plenty of business with Fuel Moto but on the Indians. I will inquire about the kits. Do you think the sumping issues will still be a problem to be feared? I mean any more or less than with the Harley kits?
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Dr.D

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Re: Motor Mods on 107
« Reply #5 on: January 09, 2019, 10:44:00 AM »

I would suggest that you first have a discussion with your friend about his feelings concerning warranty, before you spend a lot of time researching various modifications.  If he is concerned about warranty, any engine mods other than the street legal approved kits from Harley will void his powertrain warranty.  If he doesn't care about warranty and is willing to accept the risk, then I'd suggest contacting the companies Dave mentioned in his post.  Most aftermarket companies have offerings for the M8, we just don't seem to hear as much about them as we used to, probably due to the changes for 2017 and up concerning warranty repairs and illegal mods along with all the reports about serious engine failures. 

Jerry

Oh yeah that makes sense for sure. It is actually crazy that this guy is after mods no more than he rides and and considering his age and riding style. I hate to mention age because I know quite a few of us have some of that going on. :D
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FLSTFI Dave

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Re: Motor Mods on 107
« Reply #6 on: January 10, 2019, 08:11:18 AM »

Not sure what age has to do with it.  I know several in mid 60's that like a well built hot rod motor.

Riding style makes sense, if you don't push it, then it doesn't make sense, the guys above push it hard.

As for sumping, it seems much of it is with bikes the spend a lot of time over 3500 rpm.
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hrdtail78

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Re: Motor Mods on 107
« Reply #7 on: January 10, 2019, 09:18:09 AM »

S&S has a nice drop on 124 kit.  It really does come complete for $2500.  Piston, cylinders, cam, pushrods, lifters, cam, pump and plate. 

A decent pipe and a tune.  The thing will make low to mid all day.  Want more about 4000?  Do heads and throttle body.  There is no replacement for displacement.
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MCE Performance

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Re: Motor Mods on 107
« Reply #8 on: January 10, 2019, 03:42:08 PM »

S&S has a nice drop on 124 kit.  It really does come complete for $2500.  Piston, cylinders, cam, pushrods, lifters, cam, pump and plate. 

A decent pipe and a tune.  The thing will make low to mid all day.  Want more about 4000?  Do heads and throttle body.  There is no replacement for displacement.

Adding cubic inches is always going to be the most reliable route to more TQ (and HP). The M8 heads even in stock form flow an incredible amount of air. They can be made better with minimal work. A slightly larger set of intake valves help allot too.
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MCE Performance

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Re: Motor Mods on 107
« Reply #9 on: January 10, 2019, 05:25:31 PM »

Adding flow capacity (porting, larger valves, throttle body) will get you some HP but you'd have
to turn more RPM to get it. So going bigger on the motor will get you everything (HP and TQ)
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Dr.D

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Re: Motor Mods on 107
« Reply #10 on: January 10, 2019, 09:09:13 PM »

Thanks gentlemen I’ll talk to my friend.
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Dr.D

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Re: Motor Mods on 107
« Reply #11 on: January 10, 2019, 09:11:02 PM »

Not sure what age has to do with it.  I know several in mid 60's that like a well built hot rod motor.

Riding style makes sense, if you don't push it, then it doesn't make sense, the guys above push it hard.

As for sumping, it seems much of it is with bikes the spend a lot of time over 3500 rpm.

This fellow is in his 70’s and does not push hard much at all. I think he just wants it to have it wether he uses it or not. :D
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