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1050ST Rebuild - the Wombat will rise again

7K views 63 replies 13 participants last post by  DaveGPz 
#1 ·
3 months camping in the Australian deserts has let me get my head together, and I've decided to rebuild my written off 1050ST, but more as a naked kind of thing. The direction will largely be set by the look of the front, and how to get rid of the OEM dash. I'll fit the lower bars from a 955ST (they fit, and clear everything), and I'm thinking a more classic round LED headlight unit, but I don't suppose the dash from a Daytona 955 would wire in readily? Despite the beard in the photo, I'm not after a modern "cafe racer", but more something I can have a blat in the hills with, take to the track and generally not act my age on. Planning to shorten the tail, ditch the pillion position, and listen to any other advice that people may have. Not in a hurry, because I want to do as much of the fabrication and modification as I can myself. Time to up-skill :smile2:
 

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#2 ·
Good idea Davo

Sounds like a cunning plan Dave.

Of course, I have no ideas of my own.............because you know I usually just copy yours :grin2:

Although I am sure you will get useful help from all the folks here and elsewhere and look forward to watching your bike develop into your new useful hill scratcher and track tool.

Good luck with this my friend, I think you will enjoy that exercise in transforming your ST 1050.

DaveM
 
#3 ·
I've often taken the faring off my bike and thought to myself that it would make a mean looking naked bike, what with all the weight up front and that big empty wheel arch at the back (with a tail tidy on it ofc).

I know that the Speed Trip is the companies attempt at it - but they went for a "bigger engine in a street trip" rather than a "naked ST". I would love to see how this works out. Keep us posted, with lots of pics :D
 
#4 ·
Cool shirt! Can't wait to see how the project goes

Sent from my SM-G950U using Tapatalk
 
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#5 ·
It'll be a slow process; the garage also has Jill's Daytona 675, my Daytona 955 and Sprint ST 1050 and the youngest's GSX-R 750, plus a changeable number of friends' and family's R6, YZF600 and Sprint GT... but it will give me something to potter on in the evenings :wink2:
 
#7 ·
8" LED headlight arrived today (CNC fork mounted brackets); mirrors (with LED indicators) dummied into position. The look of the front end is coming together, and defines the build. The slightly spacey headlight will allow the low mount CF shorty to look appropriate, especially once the tail is trimmed. My old Daytona 955i tail light fits nicely into the curve of the standard rear fairing. 2nd hand loom is on the way to be cut and shut.
 

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#9 ·
Plan A for the underseat tray was to cut the OEM muffler in half. Fail. Couldn't fully gut it, and it still weighed a ton. However, plan B is to use the underseat tray from my old red Daytona 955i, left over from when I fitted the Trident undertail exhaust. Just had to remove the battery box and it fits a treat; plus it gives me somewhere to put the coolant overflow tank... winning! 2nd hand loom arrived, so I can start thinking about placement of ECU, R/R, fuses and relays, then cut and shut the loom to suit. I'll dummy up the headlight mounts tomorrow, then photos will follow when I can get a clear shot of the bike - youngest son brought his new K5 GSXR750 track bike home today, so we now have 6 bikes in the garage.
 
#10 ·
Rear end is shaping up. Tail unit from the lad's GSXR750, OEM tail light. D955i tray, and R/R under the ST battery box protected by the remains of the D99i battery box.
 

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#29 ·
Kinda curious about this... you said:
...Tail unit from the lad's GSXR750...
Talking about the inside tail plastics toward the back? I've always felt the tail section on this bike was way to long, proportionally, with the length of the swing arm and front of the bike once it's naked. I've been thinking about fabricating a new tail section, or somehow adapting an S3 subframe to fit.
 
#12 ·
Incidentally, RS bars are lower again than ST, if you want to be even more aggressive ..

Cheers,

Roden
The 955ST bars fit the tank cut outs nicely (I now realise because it was designed for them!). I suspect RS bars would crush my thumbs, and probably queer my attempts to get it roadworthied. Maybe a future modification, with rearsets >:)
 
#13 ·
Everything was coming along too well - I now realise that the 1050ST is sort of semi-CANBUS, and the 955i is most definitely not. The 955i instrument cluster doesn't look like it'll talk to the Keihin ECU; at the very least, there are 4 inputs on the 955i that are served by one input on the 1050ST, if I'm reading my wiring diagrams correctly. Does anyone know if the Speed Triple cluster would be compatible from the same era?
 
#15 ·
This instrument cluster is becoming something of an issue. '08 Street Triple will hot swap, tacho works, speedo works, indicators are reversed. '14 Daytona 675 will hot swap, everything works (gear indicator, tacho, speedo, shift lights) . Neither will fire the ECU up from cold. Think I need to look for a 1050 S3 owner in Melbourne who'd be willing for me to plug their dash into my ST...

Just about ready to cut the tail light surround now - mulling over gloss vs matte black.
 
#17 ·
Right then. Have the wiring diagrams for the ST and for the '08 D675 I have a dash for. There appear to be some differences in pin allocation, but before I start cutting and soldering, can anyone confirm that the pin numbering protocols are the same? As in, pin 1 always corresponds to the same physical location on the plug? Cheers!
 
#19 ·
If the 08 S3 works except for the reversed turn signals, maybe run those indicator wires on the "wrong" sides. No way around this no start issue though?

Sent from my SM-G950U using Tapatalk
 
#21 · (Edited)
Continuing optimistically to complete bodywork while looking at options regarding instruments...

Shaped the brackets to mount the LED headlight unit, finished the carbon fibre tail-light surround, mounted indicators after checking the minimum distance under Australian Design Rules (240mm lens to lens). Getting everything straight and square is making my brain hurt - actually, that may be the acetone vapours.

I'm feeling this should be a hoot to ride (one day :wink2: )
 

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#24 ·
Very kind, but I think you overestimate! I bought some 1mm carbon sheet, made a cardboard template then cut the sheet to shape with the angle grinder attachment on the Dremel. (And yes, I had a GPz1100 but didn't really connect with it)
 
#25 ·
Looks good to me. I had an Yamaha XS 1100 back in the 80s and restored it to muscle bike. Those big bore bikes back then looked tough. I would dig an 82-83 gpz 1100. They don’t handle but they do nasty long burnouts and sound the business.
 
#27 ·
The next hurdle has been overcome. Despite some solid help from the forum (thanks Tobias), cracking the canbus handshake was a bit beyond me. I think the semi-canbus nature of the ST system was the culprit. Anyway, I've sourced a compatible Keihin ECU and matching dash from a Speed Triple 1050, and finally the Wombat lives again. Starts, runs, and appears fully functional. Does anyone know the differences between the S3 and ST engines, because the tunes are quite different in timing and fuelling? The ST tune loads to the S3 ECU, but just wondering...
 
#31 ·
Got the Motodemic mount for the instrument cluster - drilled to fit the threaded holes on the ST top yoke. Slight bend to bring the instruments into my line of sight and bingo... I've run out of excuses to not start modifying the wiring loom. It's the look I was after, so I'm happy :smile2:
 

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#33 · (Edited)
@DaveGPz , where did you get that clutch cable adjuster nut? I've seen those a few times but have been unsuccessful in finding them online the few times I've done a quick search.

Also, I don't know why it didn't occur to me to mount the gauge off the upper triple before now. I swear, looking back, I've seen it done multiple times but it didn't click for me until seeing your pics.
 
#34 ·
Looking good mate

That looks damned good Dave, well-done buddy:highfive

I know you are going to do a great job on this rebuild mate.

Dave thanks for posting up the progress, it's fun to follow and you have good taste and do nice work.

Mmm wires we are now delving into the area for me at least that remains a mystery of a dark science............electrickery!



good luck friend
Cheers
DaveM:smile2:
 
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