Those are my thoughts. 96 to 107 is a no-brainer. However, 103 to 107 doesn't seem to have quite the return on investment if you already have decent cams. With the stock heads & throttle body these motors seem to be maxed out around 1.0-1.2 flywheel hp/cube, so bored jugs and pistons with no other changes get you 4-5 hp at the wheel.

 

Thats with the Bassani 2-1 RoadRage, and a SE Heavy breather.

Ya, 4hp and 4 tq was a little expensive, but it is suprising as how the bike really jumps with just 4 and 4 more. It feels like more than that.

I am glad I did it.

Doug

BTW: The heads had a "street" port and polish by Big Boys Head Porting Service when I did the 103 build two years ago so they are not totally stock, still think I should have gotten a little more.
Dyno guy said they just had the dyno re-calibrated last week and it has been a little stingy with the numbers.

 

That's not stingy, that is truthful. Basically dynos vary and they are a tuning tool. Before and after results are what matter.

 

Sounds about right with stock heads, see my specs below.

 

Sounds about right. Also note that for many of us that haven't pulled the trigger on the kit yet (waiting until I can ride down to Little Chute in May), many of the dynos we see are from the same dyno (Jamie's). If you went somewhere else the dyno may be be calibrated a little different or may be a little variance in the Dealer tuner's skills. Also temps, humidity, etc can affect the numbers. If it is running like a bat out of hell, I'd be pretty happy personally.

 

Varooom - Since you have some miles on the bike, how is the engine temperature out on the highways? Higher, about the same? I am considering the FM 107 kit and just wondering if there is a issue with heat.

 

NEcaveman,

I have the HD oil cooler and Dakota digital gadges, including oil temp.

I have not noticed any difference in oil temps from when it was a 96, to 103, to 107.

Normal crusing is in the 190 to 210 range. If I get stuck in traffic it has been as high as 230.

Running the highway at about 80 mph it stays right in the 200 range.

I would not worry about temp problems going to a 107.

Doug

 

I think that is pretty sad. You spent over $1200 to get 4 hp. For some basic head work with your 103 you would have saved some money. And now you want to spend $700 more and maybe gain 5/8 more.
Maybe I am thinking out loud here.
Sorry just my thought.

 

I wonder if his bike was run on the same bike with the 103 and the 107. I would like to see the runs printed on the same page so we could get a real comparison. you mihgt find that he gained ONLY 4 and 4 on the peak numbers, but the 107 might / probably is alot better thoughout the RPM range. I wouldn't be surprised to see much higher than 4 point gains in both HP and TRQ in the lower RPM's.

 

This thread is a perfect example of "do it right the first time." Increasing engine power one stage at a time cost a lot more money in the long run. Decide what you want out of the bike and do it right the first time. I have a built 107 in my Street Gide that produces great power and it's a lot of fun to ride. However, knowing what i know now, and the costs, if i had to do over again i'd just drop a 120R in there and be done with it.