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Author Topic: So, what if I actually wanted a little speed from my ol' 750?  (Read 3633 times)
BlackKat
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« on: November 05, 2010, 05:01:18 PM »

as the title says, what if I were delusional enough to want my 99 750 to be a little bit fast?  Weisco is in my back yard and they don't offer pistons any longer...In my neck of the woods, thats the goto application...

Anyone suggest anyone who currently has something for me to spend like $1500.00 on to gain 9 bhp?  drink  Pistons? Different cam? Did I really just say that? $1500 for 9 bhp...Its the principle!

MOTOR SWAP?  laughingdp
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DarkStaR
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« Reply #1 on: November 05, 2010, 05:06:31 PM »

Do a carbed 900 motor swap, and you "SHOULD" get more than 9hp out of it.
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BlackKat
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« Reply #2 on: November 05, 2010, 05:24:42 PM »

Thats an option on the table...obviously more money, but are there any water cooled options that can go in? I realize anything fits anyplace for the right money...but the bike is, what it is and I love her!

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xcaptainxbloodx
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« Reply #3 on: November 05, 2010, 06:35:13 PM »

what is your end goal? to build a faster 750? a fun, fast bike to ride?

if you want your bike to be as fast as possible the skies the limit. carbs, overbore (and associated engine mods), dyno tune, exhaust, intake... what state is the bike in now? overbore would not be my first step in performance. you will spend a lot of money, have a ton of headaches and not get a HUGE boost.

if you want a fast fun bike, add up the expense of mods sell the bike and buy a faster bike. I know its a bitter pill to swallow, nobody wants to get rid of their baby just because a stupid little thing like logic says its a good idea but if you want a faster bike that will still be reliable it really is the smartest way to go.
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Travman
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« Reply #4 on: November 05, 2010, 06:55:18 PM »

Thats an option on the table...obviously more money, but are there any water cooled options that can go in? I realize anything fits anyplace for the right money...but the bike is, what it is and I love her!
You have the silver metal flaked bike that is striving for a cafe racer look.  I think the water cooled motors would be contrary to the direction you are trying to take your bike. 

This DS1000 Sport Classic engine is my suggestion.  It is a little more than your budget, but it will make a lot more than 9 more hp.
http://cgi.ebay.com/ebaymotors/08-DUCATI-SPORT-CLASSIC-1000-ENGINE-MOTOR-DS1000-MINT-/270607416350?pt=Motorcycles_Parts_Accessories&hash=%257B%2522Page%2522%253A%2522%252FMotorcycle-Parts-%252F10063%252Fi.html%253F_nkw%253Dsport%252520classic%2526_dmpt%253DMotorcycles_Parts_Accessories%2526_fln%253D1%2526_ssov%253D1%2526_trksid%253Dp4506.c0.m282%2526Part%25252520Type%253DEngines%25252520%25252526%25252520Components%2526hash%253Ditem3f01757c1e%2522%257D
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BlackKat
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« Reply #5 on: November 06, 2010, 03:09:54 AM »

That would be quite sexy. The bike is fun, I want a little more out of it. I agree a different bike is really the way to go. The air box has been removed and replaced with 2 K&N conical elements then jetted on the dyno to the best possible with what I have. It sounds effin amazing, but it reminds me of a Ferrari 308...it makes a lot of sexy noise but when you finally look at the speedo...its actually not fast!

I've tried to lighten her up as much as I can too...But really, I think I have taken off 10lbs at best. the brakes have been updated to a twin front set up up from a 900 with hopes for more speed... $1500 is what I was budgeting for go fast bits...perhaps I'll just put that in an 848 fund  Grin

This is only my second bike...I've been riding for under a year. I just didn't think I would get so used to the (lack of) power so fast!

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The Mad King Pepe'
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« Reply #6 on: November 06, 2010, 05:27:57 AM »

Brad the bike boy has lots of info on his site. From what I've gathered through his knowledge and this forum I can tell you: the 750 was not well designed and requires substantial amounts of money to get real performance out of.

The cheapest solution for more performance is to get a 900 engine and re-jet your carbs (carb size is the same for 900-750-(and maybe)-600, only the jetting changes). Putting in a Fuel Injected engine requires more work since you either need to convert the engine to carbs, or get the injectors, ECU and wiring for it installed and setup.

Best way overall to get more performance is to sell your 750 and get a 1000 Dual Spark (or larger). Much cheaper and painless in the end.

Now if you're a little Wink OCD like me, keep reading...

If you want to keep your current engine then Ferracci sells both high-comp pistons ($420) and a big-bore w. high-comp ($950 - send them your jugs). Chris Kelly also has big-bore pistons ($500) but you have to send your cilinders to be bored independently.

To get the most out of the above tho, you need to have your heads worked for better flow and larger valves. Chris can send your heads to Guy Martin at MBPDucati for this but it's very pricey ~ $3k (head work + larger valves).

A cheaper alternative to this would be getting the heads off an 800 engine and putting them on your 750. The 800 heads have the 'good' 900 size valves and flow. I've asked Brad (the bike boy) about this and he said it could potentially work BUT the 800 heads require high-comp pistons and some work for everything to fit right.

My long-term plan with my 750 is to get the 800 heads and high-comp pistons (maybe with a big-bore kit) and drop in a 6-speed gearbox from an 800 as well. Eventually I'll also put in FCR's -- they're awesome, but also pricey. Total should be around $2500.

Sorry for the long post, hope it helps tho Wink
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xcaptainxbloodx
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« Reply #7 on: November 06, 2010, 07:52:18 AM »


My long-term plan with my 750 is to get the 800 heads and high-comp pistons (maybe with a big-bore kit) and drop in a 6-speed gearbox from an 800 as well. Eventually I'll also put in FCR's -- they're awesome, but also pricey. Total should be around $2500.

no offense to pepe, these plans sound awesome and I dont want to be a smartass. just to put this in perspective for the OP.

if his bike is worth more than 4k$ and you add the 2500~$ you can very easily swing an s2r 800, or even 1000 (s4r? pretty close...) that may have some cool mods done already, and from the time the bike is listed for sale to the time the new ones bought you could actually be riding sooner than waiting for work to be done.  something to think about...
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The Mad King Pepe'
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« Reply #8 on: November 06, 2010, 12:16:58 PM »

No offense at all! And after all my drooling and dreaming about mods and stuff, I'm fully aware that my bike will still be a 750 and there is no way I can recoup my expenses if I want to sell it.

But that's not what I'm interested in, for example if I had 5k right now, I'd rather spend them on my 750 than go and buy an S2r or anything else.

I didn't point that out b/c it seems to me that the OP has already put some good money into his bike and would rather continue on that road than buy another bike, but maybe I'm wrong...

We'll see  Wink
Anyway, cheers to all and happy  [moto]
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Then they came for the Trade Unionists, and I did not speak out-- Because I was not a Trade Unionist.
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xcaptainxbloodx
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« Reply #9 on: November 06, 2010, 05:36:24 PM »

No offense at all! And after all my drooling and dreaming about mods and stuff, I'm fully aware that my bike will still be a 750 and there is no way I can recoup my expenses if I want to sell it.

But that's not what I'm interested in, for example if I had 5k right now, I'd rather spend them on my 750 than go and buy an S2r or anything else.

I didn't point that out b/c it seems to me that the OP has already put some good money into his bike and would rather continue on that road than buy another bike, but maybe I'm wrong...

We'll see  Wink
Anyway, cheers to all and happy  [moto]

im right with ya man, I want to do stuff to my s2r 800 too, its got a full system and after this winter it will have a PCIII, tpo beast, lightend flywheel and dyno tune. after that returns get so diminishing that I would rather just enjoy it and start another bike.   

If we really wanted fast bikes we would be buying 5 year old japanese liter bikes that cost 1/3 what our slow ass italian naked bikes do. cheeky
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BlackKat
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« Reply #10 on: November 07, 2010, 04:28:51 AM »

I keep having to remind myself its a hobby, not a business. No matter what I put into it, I won't add value and its not about the resale! The bike is mine and what I do is for me...I could get a newer faster model, but I have to say I don't care so much for the "battle star galactic" styling of the newer monsters or street fighters. Maybe there is an 848 in my future, but I like the style and simple lines of the older bikes...but the performance of something a bit more modern.

Perhaps just play with the gearing seeing as with my cafe style and no fairing, the bike is just plain scary at 100mph... Grin
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Duck-Stew
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« Reply #11 on: November 07, 2010, 07:01:24 AM »

If you're good with the fact that modding a 750 for power is financial-suicide, then read on.  If you're considering a different motor, skip to the bottom.

Compression is low on the 750's.  The Ferracci pistons are the cheapest option.

Modding the 750 heads to flow more air is stupid.  All the geometry in there is wrong.  Either 620 or 800 heads will bolt on but require the above pistons to make them really work. 

(I call this Stage-1: hi-comp pistons & 620/800/695 heads)  great improvement over stock, but you're still with the std. wet clutch & 5-speed.

Anything more than that gets expensive quick...  I'm doing a Stage-2 for my '99 M750 and I'm really spending the $ with little more hp at the end of this tunnel.

ENGINE SWAP SKINNY:
If you're after the most bang-for-the-buck out of small case Duc motor, find a 2005-06 800 motor.  Here's why: later 800's had 7mm valve stems which have soft valve guides, earlier 800 motors had 5-speed transmissions, you get the APTC wet slipper cluth, your current exhaust WILL fit, your carb manifolds will fit, and it will look the same externally despite making 900 power.  You will have to buy an Ignitech ignition module to fire your coils and you will have to drill your frame to 12mm on the engine bolts and get a 14 & 15mm socket turned down to tighten the engine bolts but that's it.  Best bang for the buck IMO.

If $$ isn't an issue, as big as an M1100 motor will fit if you covert it to carbs and you'd still have to do the ignitech module and engine mounting bolt mod.

Any attempt to covert this bike to EFI will result in quickly realizing there is a frame cross-tube that's an interference.  Cutting and welding the frame is in order for an EFI conversion.

PM me with questions...
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The Mad King Pepe'
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« Reply #12 on: November 08, 2010, 05:48:56 AM »

Modding the 750 heads to flow more air is stupid.  All the geometry in there is wrong.  Either 620 or 800 heads will bolt on but require the above pistons to make them really work.

(I call this Stage-1: hi-comp pistons & 620/800/695 heads)  great improvement over stock, but you're still with the std. wet clutch & 5-speed.
From what I've read on Brad's site here. The 800 engine has the 43/38 valves (In/Out) while the 620 has the 41/35 (same as the 750 and 'bad' heads on the 900). I absolutely do not want to pit one guy against another, but I'd like to know which is correct since 800 head are rare and expensive to come by, while 620 heads are cheaper. EG on ebay: $400 for each 800 and $200 for each 620.

If that is the stage-1 then what is your stage-2?
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Then they came for the Trade Unionists, and I did not speak out-- Because I was not a Trade Unionist.
Then they came for the Jews, and I did not speak out-- Because I was not a Jew.
Then they came for me--and there was no one left to speak for me.
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« Reply #13 on: November 08, 2010, 11:28:29 AM »

695 heads will also fit, but then you're into the 7mm valve guides.  If you're interested, I have a pair of cosmetically challenged 620 heads for $200 for both.  The 800/695 heads are better, but 620 heads are also an improvement over the 750 heads...

As far as Stage 2 goes, it's an overbore, big valves & big cams.  I've got a 799 build going on with some 900i.e. cams and big valves with a 6-speed trans...  It will probably barely outrun a Stage 1 motor but cost at least twice as much...
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Raux
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« Reply #14 on: November 08, 2010, 11:32:19 AM »

would 696 heads fit?

because they are the best flowing heads to date for the smaller motors. bigger valves etc.
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