I've got a '97 m750, with a custom-fit Sil Moto exhaust (custom, because that was the only way to make it fit), & a stage 2 DJ kit in its original carbs. 58k hard-earned miles on the engine and a dead clutch. I have a line on a similar vintage m900 motor with its 6spd transmission - motor runs but has a dead cylinder - for a handful of magic beans. I also have the hair-brained idea of buying this motor, replacing the bad cylinder and dropping in a pair of hi-comp pistons, and stuffing the whole assembly into the m750. A couple reasons: I've always wanted to hop up an engine; it would be nice to have another gear and more power; because the bike is already non-stock (courtesy of an absent-minded Hyundai driver), and ... because, why not?
Presumably, at the very least, I will need shorter intakes and taller exhaust header pipes. Possibly more appropriate ignition coils? I don't recall if my '97 have Mikuni 36s or 38s, so a pair of carbs might be required as well. What else am I not thinking of?
Yes, I know, they make new/better bikes all the time - but I love my '97. I like the idea of hot-rodding it. Making it a bit of a sleeper. It'll take convincing me of my sheer & utterly complete lunacy to get this idea out of my head - but I'm willing to listen if somebody can convince me that it's a truly stupid idea. Will it take effort, time & money? Yes, I understand that. Can I do most of it myself? Probably (except modifying the exhaust, but I have a welding buddy who can handle that). But if you say I'm going turn my frame into a pretzel, that could deter me. (Although, I've already cross-braced the front engine mounts)
So there's my questions to you, dear readers:
1. Is this a worthwhile undertaking? Or am I just a dumbass for trying.
2. Barring being a dumbass, what do I need to think about if I do this?
Thanks in advance for your input. y'all rock.
Go for it. Although M900s are around with all the work done.
That's what Rudemouthsky is doing. He's going the Full Monty with it though, so I suggest don't go full Rudemouthsky, only partial Rudemouthsky ;D Unless you want to and we will enable. ;)
Here's a basic DIY recipe'.
JE high comp pistons
Ignitech Ignition
Exactfit coils
Light flywheel.
Jet kit and open airbox with K&N filter.
Optional, but awesome and $$$.
944 kit
FCR carbs*
Porting
Cams
Bigger inlet valve.
There is nothing stopping you giving the ports and intake manifolds a clean up if you are conservative and careful.
* Besides porting, with this mod you will feel a significant improvement in engine response.
The frames are the same, and if you get a 900 of the same vintage the mount bolts should be the same too.
Lots of info on Brad Black's site about carbs bikeboy.org. I think they're basically the same. Koko's suggestion about FCRs is good, but be aware they're very different than the Mikunis and require a different start up procedure and a bunch of tweaking to get right.
I say go for it. You'll love the 900.
Go for it
I think the only major different between the M750 & M900 outside of the engine is the M900 has dual front brakes. Depending on the $$$ you have just start by fitting the standard 900 motor. I believe the carburettor and ignition are the same so upgrading them can come later!
Nick at nick@angladaoriginals.com often has complete low k 900's for sale (pre 97 Monster 900's have the bigger valves in 97 the M900 got the smaller 750 heads with smaller valve for better low end torque)
Quote from: MonsterMadMarty on November 17, 2014, 02:31:00 PM
(pre 97 Monster 900's have the bigger valves in 97 the M900 got the smaller 750 heads with smaller valve for better low end torque)
Big valves & cams have a 'V' stamped into the head.
Small valves & cams have a 'W'...
+ 1 there. Get the V head for sure.
Just a silly question. Would dual discs matter ? For me, I'm not going to go any faster with a 900 motor. I'm just going to get to the same speed faster. For my dollar, I'd leave the single disc and save a couple of pounds with better brake pads.
Sounds great, but most importantly, what's happening with your old 750 engine? ;D
Partway through doing similar to my 750, but just upgrading the 750 engine itself with pistons/FCRs etc, not dropping in a 900.
I love you people. You're my new favorite crack. Enable! Enable! Enable!
@Nibor - not entirely sure what to do with the 750 lump. It began feeling a little tired, so I was already considering a refresh around 75k. I'd like to think I'd rebuild it on the bench, then maybe find a frame to tuck it into. Although, I've often daydreamed about adding a turbo or supercharger to a Ducati lump ...
Otherwise, the 944 kit was on my list at first too, but I thought I might get more-for-less out of a pair hi-comps. Plus the over-bore would be more one thing I couldn't do myself.
Ok, you've made me feel less like a lunatic. Or maybe more of a lunatic who has good company, which is even better. Many thanks! I'll be sure to detail things here if/when I take the plunge!
We're all lunatics in good company. When I was looking to do my 750 hot rod stuff I found out either the 786cc kit or a hi-comp kit was the same price, fcr's were double that. Add the 2 up and can still get a 900 for almost the same money and makes more power stock.
You'll shoot yer eye out!