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Author Topic: FBF 11:1 high comp pistons for the 750?  (Read 3219 times)
memper
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« on: December 22, 2012, 06:07:23 AM »
Just noticed FBF has this kit for not a mint. Is just installing these HC pistons a worthwhile upgrade? How about with FCR's? Is it really a "drop in" install or is machining required?
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« Reply #1 on: December 23, 2012, 12:42:55 PM »
Yes.

I have those pistons and 39mm FCRs on my '97 M750.

Worth every penny.
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« Reply #2 on: December 23, 2012, 03:01:18 PM »
Quote from: 10/10ths on December 23, 2012, 12:42:55 PM
Yes.

I have those pistons and 39mm FCRs on my '97 M750.

Worth every penny.

Did you have to make any ignition adjustments with the pistons?
Do you get away with standard fuel octane?
The reason I ask is that high comp on an old 900 involves ignition adjustments and premium fuel. If you can get away without those issues on a 750 then that's even more of a drop in mod.
I would be cautious about some projected reach spark plugs having sufficient clearance of the piston crown with some piston brands. There are enough types of plugs around in the correct heat range to deal with that.
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memper
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« Reply #3 on: December 23, 2012, 03:37:53 PM »
Good questions koko. Didn't even consider the plug spacing. From what I have read 11:1 isn't really all that high and doesn't require higher octane.
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« Reply #4 on: December 23, 2012, 03:56:52 PM »
Quote from: memper on December 23, 2012, 03:37:53 PM
Good questions koko. Didn't even consider the plug spacing. From what I have read 11:1 isn't really all that high and doesn't require higher octane.
For some reason I think I remember reading here that the FBF pistons are actually a bit higher than the stated 11:1.

I could be wrong.

The octane requirement will be dictated by whether or not you experience any pinging.
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« Reply #5 on: December 23, 2012, 04:14:44 PM »
A mates 900 with Pistals (IIRC) closed up the gaps on his Denso "equivalents" to NGK DPR8EA. When I measured them against each other there was an easy 1mm difference. Always worth checking. On a 944 motor with skimmed heads, I used the NGK DR8EIX instead of the projected reach DPR8EIX-9s. Upon inspection, the DR8EIX still have a projected reach (unlike the non iridium version), but not as much. A nice compromise plug if you still want the benefits of PR plugs. They should have the heat range for your 750.
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« Reply #6 on: December 23, 2012, 04:20:58 PM »
Quote from: ducpainter on December 23, 2012, 03:56:52 PM
For some reason I think I remember reading here that the FBF pistons are actually a bit higher than the stated 11:1.

I could be wrong.

The octane requirement will be dictated by whether or not you experience any pinging.

Who makes the FBF pistons now? Flat or dome crown?

It would be nice if the 750 copes ok with stock timing. Adjusting pick ups is a PITA. I would just slap on an Igniteck and knock off some timing if it meant you could use regular gas.
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« Reply #7 on: December 23, 2012, 04:23:36 PM »
Quote from: koko64 on December 23, 2012, 04:20:58 PM
Who makes the FBF pistons now? Flat or dome crown?

It would be nice if the 750 copes ok with stock timing. Adjusting pick ups is a PITA. I would just slap on an Igniteck and knock off some timing if it meant you could use regular gas.
Pretty sure they're J&E
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« Reply #8 on: December 23, 2012, 06:30:48 PM »
I just wrote them asking all these questions.
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« Reply #9 on: December 24, 2012, 08:03:09 AM »
If I remember correctly, FBF offered two compression ratios, one was OK with 93 octane and one required race fuel.

My bike has stock plugs and ran fine with zero changes to plugs or ignition.

I added the Czeck "Ignatech" electronic timing box last month and the bike runs even better.

I ran the FBF pistons with stock ignition and 93 octane pump gas for three years with zero problems.

I am really liking the new Ignatech timing box. It increased my MPG from 44 mpg to 50 mpg and she runs cooler and fires up easier and dyno'd 65hp and 50ft/lbs at the wheel.

Cheers.
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brad black
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« Reply #10 on: December 25, 2012, 03:38:50 PM »
you mean the $420 ones?  i wouldn't call that cheap.  the 750 is a dog, ditch it for this

http://www.ebay.com.au/itm/02-Ducati-Supersport-900ss-900-ENGINE-MOTOR-VIDEOS-/130748939916?pt=Motorcycles_Parts_Accessories&hash=item1e713e7e8c

ignitech, split fcr, fit some je if you really want to.  it'll farking raaaaawk man.

sorry, channelled the turtle from finding nemo for a second there.
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« Reply #11 on: December 25, 2012, 03:41:04 PM »
Quote from: brad black on December 25, 2012, 03:38:50 PM
sorry, channelled the turtle from finding nemo for a second there.

Woah...
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« Reply #12 on: December 25, 2012, 05:04:05 PM »
$400 is light compared to what other more "serious" mods can cost. But I see the logic. $420+tax+shipping and it comes close to the price for a used 900 engine.
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« Reply #13 on: December 25, 2012, 08:21:30 PM »
Quote from: memper on December 25, 2012, 05:04:05 PM
$400 is light compared to what other more "serious" mods can cost. But I see the logic. $420+tax+shipping and it comes close to the price for a used 900 engine.

+1
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« Reply #14 on: December 26, 2012, 05:41:16 AM »
Quote from: memper on December 25, 2012, 05:04:05 PM
$400 is light compared to what other more "serious" mods can cost. But I see the logic. $420+tax+shipping and it comes close to the price for a used 900 engine.

Here's a drop-in engine used 900 engine, near DC, for $400. Believe me, if I had the funds, this would be sitting in my apartment right now!

http://washingtondc.craigslist.org/mld/mcy/3489247396.html
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