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Monster Fatigue M900Sie (MY2K)

W

WAH

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Joined
Jan 24, 2024
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35
Location
Burnham on Crouch
Bike
Other Ducati
Well, I guess we all get what we deserve, eventually, I asked for a project and boy has this been the Mother of all, I’ve been fortunate with my previous rescue projects, in comparison they’ve been a walk in the park and I’ve thoroughly enjoyed them, but this one is a real doozy and I’m near the end of my rope with this bike.
It’s been almost a year now and it’s still not running properly, it’s been to Marcus @ Rosso Corse, he had it for a month in the summer and there was little or no real improvement. It’s currently with Alec @ Pro Team Italia, he’s been at it since mid November and still seeking a solution. I’ve asked Alec to please persevere as long as he can take it, bless him.
In my care, apart from the basic maintenance chores, I replaced every sensor and the ignition coils, additionally, I’ve supplied Alec with a spare ECU, TPS, throttle bodies and new injectors to try. I’ve spent way more than it’s worth. Small consolation, I’m quietly pleased the issue wasn’t something simple that I’d missed.
For now, Alec is looking at it as & when he can find time, we’ve agreed there’s no rush, I don’t ride in winter anymore.
So, if it should prove unfixable I shall be breaking it (or setting fire to it!) in the new year, gutted doesn’t come close!
Will update if there’s any progress.

Merry Christmas and Happy New Year to all UKMOC members.

Cheers all!

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That sounds Infuriating mate!
For what it's worth the M900Sie is one of the very best Monsters out there, certainly the pinnacle of the 900's.
I reckon it'll all be worth when it's all sorted out. It's going to be something simple when somebody finally puts their finger on it.
I could have given you a list of simple and cheap things to check before farming it out, but too late now.

What were the symptoms btw?
 
symptoms appeared quite straightforward initially, hanging throttle around 2.5k then unable to hold a steady throttle around 4k, which felt like fuel starvation, stuttering, the most infuriating part was it would take full throttle application seemingly without issue if you ragged it through the gears but then would hang again on the down shift. I'm sure Alec will cure it eventually, tis only time and money after all.
 
I know its no commiseration, but the first one you had and thankfully passed my way as the SS was just too much for a creaky back and wrists, runs like a swiss watch and makes me grin stupidly every time I take her out. If I was a kindly soul I'd offer her back, fortunately I'm a rotten swine .... she'll be right. ;)
 
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Oh! Sounds like a tricky one.
I'd suspect the TPS, which can be very tricky to set up, but Alec will be able to check that no bother.
Then I would look at throttle cables, butterflies and butterfly shaft for smooth and proper action. Butterflies should be firmly attached to the shaft and not binding on the throttle body.
The shaft should be a good fit in the bodies too, with no possibility of air getting past the pivots.
The return springs on the quadrant should be in good order, not snagging on anything and hooked up on the right positions.
The fast idle part can stick and foul sometimes too.
Could also be cracked intake tubes or missing/leaking vacuum gauge bungs, or an air leak of any sort. (Perished rubber manifold connectors.)
I think you can test for that by spraying easy-start round it and see if it makes it race?
It could possibly be the petrol tank breather, but the fact that you can rag it up to full pelt kind of contradicts that unless of course you are getting the fuel in before the negative pressure in the tank starves it? But it probably wouldn't make it hang up on the way down.
Running it with the cap cracked open would diagnose that.

I hope you get to the bottom of it.
Keep us up to speed.
 
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I too feel your pain.
I have a '96 carbed 750 which has proved to be as troublesome as yours.
I wanted old school tech but have wondered many times if I did the right thing in buying mine and whether I should have gone for an injected Monster? What put me off was a 620i I owned which leaked from the plastic tank and I didn't want a repeat of similar issues.
The M750 has been off the road by far more often than on but it's great when it's running well.
The last time I took it properly out at the end of the summer it spat off a silencer which led to more time off the road while I sourced a replacement which came FOC from one of the good guys on this forum. It could have been my fault as the OE fixings had been messed about with by one of the PO's so I shouldn't blame the bike for that.
I'm hoping and praying that mine will now run reliably when I put it back on the road in the early spring.
I'd hang on in there if you can but well understand your dilemma.
 
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Thanks Gazza, yep pretty much covers the basic stuff I tried early doors, to no avail, spoke with Alec and he's confident the hanging throttle is cured, no mention of how, but alas, on the test ride it's still not behaving. If nothing else it's an object lesson on how not to lay up (ignore?) a Ducati for extended periods.
Hopefully some better news in the new year. ;)
 
Been there its infuriating ,,, hope it gets solved I know how one self confidences dies when you do everything and throw cash at its and consult pro experts and its still baffles everyone .
Had an issue 2 years ago with the S4 and the Monster 750,, one was ECU and dodgy connector related the other was wrong grade spark plugs ???? which was weird as the bike had run fine on them for 7 years ????

However,,, im actually in a battle with my 750ss at the moment ,, All electrics are fine so its one carb that is not working at all , so 750ss runs on Vertical cylinder but not on horizontal...

But it runs perfectly when I put the Monster 750 carbs on ???? The offending carb has fuel in and has been fully refurbished , just taken it apart again and its all visually fine ???? hmmm
 
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Thanks jerry, hope you get it sorted, confess I gave up trying with cv carbs, I could usually get by in the old days pre cv, but now if needed always send mine to Allens Performance, they've never failed to fix them, bolt them on and away you go, no issues.
 
had a hanging throttle on my 1100 evo on the downshift when i bought it, connection between reg/rec and alt was corroded (found by chance ) and was ok after
merry Christmas
 
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Update:
Alec returned the monster this morning, think he was pleased to see the back of it, appears to be running sweetly enough now however, no road test for me yet as all our roads here are currently smothered in salt and clart, Alec has ridden it and pronounced himself happy with it so thats positive.
As for the issue(s) it was a combination of factors, a damaged wire in the loom (by the headstock) from the engine kill switch, then replacement of the injector bodies assembly with new injectors also one of the ECUs I supplied would not save the fuel trimmer adjustments. Reverted to prior setting each time the ignition was switched off.
Final words to Alec "It's certainly been educational!"

cheers all and thanks for all your supportive comments, roll on some decent weather!
 
Ah, the old broken wire by the headstock.
A fairly common issue. I had it myself on my 750.
It didn't affect the running of the bike though, just the starting. I used to have to press and hold the start button then wiggle the steering left to right to get the starter motor to fire. But then the bike ran absolutely fine. Never could quite figure that.
It was a long term issue too ... I ran the bike like that for about 18 months and many thousands of miles before finally fixing it.
My bike is a carbie though. No ecu weirdness to consider.
Glad you finally got it sorted.
 
Well done for sticking with it, rather than torching it. Hope it returns your perseverance, with many trouble free miles.
 
Glad you stuck with it,let's hope it's all sorted now 🤞

Looking forward to a road test report.Incidentally,agree about the crap on the roads,around here in Cambridge they are still white with salt and you can see clouds of it kicked up by the traffic,can't imagine that doing the bike much good.

Kimbo
 
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