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Suzuki GSX-R 750 M (1991)

Discussion in 'My Bike' started by supamodel, Dec 21, 2009.

  1. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    Right, so here's the backup steed/track hack/last of the awesome oil-cooled gixxers. 1991 GSX-R 750.

    For those that don't know their bike history, the 'proper' GSX-R lineup (we're ignoring the 400 and 250s here :D) started in 1985, with a race-rep for the road. Pretty powerful engines, light weight, and interesting handling characteristics of the frame defined them. They were air (strictly speaking, oil: they have an oil radiator) cooled motors.

    The engines got upgraded a bit throughout the years, the weight slowly increased, too. In 1991 the final oil-cooled gixxer 750 came out, with enclosed headlights and some other fruity things (USD forks were introduced in 1990).

    A few years back (2002, actually), my dad bought one. Owner lived in Pakenham, and, in lieu of a licence he needed to move his bike on so he had enough cash for the trains for 12 months. A bargain was had. I was dispatched to bring it back, mid-winter... A moderately interesting experience, that's for sure.

    Dad's put about 12k km on it over the years. He really hasn't ridden it much since I left tassie in late '04; the fact he's away for motorsport stuff for about 2/3rds of the year kinda puts paid to any riding. He's also 63, and decided it was time to give up riding (though I doubt that resolution will last long). A mutually agreeable solution was found to the fact he needed to move it on but a) didn't really want to part with it and b) couldn't find a buyer anyway (they are fairly long in the tooth and all... fairly overlooked bike).

    Thus I was to take it back to Canberra sometime in 2010.

    Circumstances changed slightly, so I'm now taking it back early. It'll be my transport to the boat, thence to my uncle's to pick up my car. I'll then make another trip back to Melbourne to pick the damned thing up.

    Enough crapping on about it. The bike...

    [​IMG]
    The beast, in all its glory. Looks good in the proper Suzuki colours.

    [​IMG]
    BT010's. Probably predate about half the forum member's licences. Scratch that, might just be older than most of the forum member.

    [​IMG]
    Ahh, lovely size, the old 170/60R17 rear tyre. Not the easiest thing to find good rubber in these days. Very mixed reports about running a 180/55 on these things: the '91s run a 5.5" rim so theoretically they can do that, but the profile of a 180 is similar on the sides but flatter in the middle, and handling does suffer. These things need all the handling they can get. Pilot Powers come in 170/60 though :).

    [​IMG]
    103,000 km. Never had the motor touched other than usual servicing. Runs quite well, although I had to drain the stale fuel out of the carbies (it hadn't been started since January this year).

    [​IMG]
    Bike had a bit of work done to it at Balls (and was where it was serviced for most of it's Victorian life). RIP Ron 'Balls' Solomon, too.

    So, that's where it's at. Plans? Well, it needs new tyres once I get it back to Canberra. It really needs a damned good clean. It needs the valve clearances done sometime soon, but I have just given it some new oil etc. Pods and a jet-kit to suit the Yoshi full system on it would also be a good plan. Other than that: commute till either Whippet is registered or the Monster is fixed, and, after that... TRACK BIKE :up . Won't be the fastest thing around, but hey, free track bikes are free track bikes...

    (It's free in that I'm not actually taking it or being given it. Extended loan. Think of it as an appropriate retirement package. Only proviso is I'm not allowed to sell it, unless the old boy wants it sold, or, he gets the proceeds).
     
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  2. 2ndclasscitizen
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    2ndclasscitizen Member Veteran Member

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    Has it been tuned/modded by Balls? If so, niiiiiiiiiiice,
     
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  3. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    Balls did a jetkit to suit the pipe and rebuilt the suspension back in 99 (as well as servicing it since about 95, till 2002). It's pretty healthy though it probably needs a retune, and the suspension is in need of a refresh (plus the previous owner was a midget; it still handles better than a usual '91 gixxer).
     
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  4. Michael
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    Michael Member

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    Sweeeet...

    But, the important question... does it wheelie?
     
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  5. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    It wheelies better than I can wheelie. Got the clutch working better today by clutching it up in 2nd.
     
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  6. Jono
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    Jono Guest

    Wow... old :lol

    That bike looks too nice and tidy for you. I think you should give it to me for Christmas.
     
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  7. adr1an
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    adr1an Curator Administrator

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    Hey - I used to like the BT-010's!
    (but yes.. they are what... 4-generations old now ? :shock: )

    Bit contaminated from sitting in the oil, or they on its way out ?

    So how exactly is this whole transport to canberra thing going to work ? You getting bike and car to melbourne, then leave bike, drive to canberra, drive back to mel, drive back to canberra ?
     
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  8. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    Unless it had a clutch in its first 20k km... it's an original clutch. I think it's partly been contaminated, partly from just sitting around... and partly being bloody old.

    Transport thing to Canberra is working like this:
    Gixxer Hobart -> Devo (5 Jan), hop on ferry. Get off ferry, then gixxer ridden to uncle's place. Beastly Jazz driven back to Canberra (6 Jan), transporting a few work mates (saving them on flights = I earn a few cartons & some $$$ too). I've then borrowed myself a bike trailer (cheers Soc) and I'll drive back down in the driftjero and pick it up on the 7th.

    EDIT: Probably should have put in here that I couldn't get a vehicle on a different sailing to the one I originally booked - the boat is that full. So what I did was delay my sailing by a day, and left my car at my uncle's. I then got my way out to the boat and went aboard as a passenger without a vehicle. Because that actually saved some money, I used that money to change from a seat to a shared cabin :D. Which was quite nice, really. So at the moment I have a bike here, plus the use of at least 4 cars to get me around (old man + stepmother have 3 cars between them... plus then there's a spare car my brother has. Yes, I have a vehicle mad family).

    I'd ride it further but, yeah... slabbing it doesn't really appeal to me and I'd also like to have my car back in Canberra :). And too much of a prick in terms of flights. One day Canberra->Melbourne->Canberra in a 4wd with cruise control is a piece of piss (though it will be the last run for the driftjero. I don't need 4 bikes -- admittedly 2 are posties -- and 2 cars).

    After that, well... the gixxer is rego'd till early May. I think it needs a dyno run ASAP; see how the fuelling is, for one. Given it's also got a fucked rear tyre, might as well dyno it with a tired tyre. Get in a set of powers for it, and then take it into the hills and give it a proper shakedown. Then the great progress to track bike can continue (Dad's actually supportive of this - so long as I keep the good quality road bodywork for it! He likes to see things being driven or ridden properly. Hence the whole extended loan thing).

    Took it out for a post-dinner lash, and it still goes nicely. The tyres are bloody slippery though!
     
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  9. Jono
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    Jono Guest

    Yes :thumbsup:
     
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  10. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    I mean, that's actually how the discussion got started with the old man.

    Plus it might make a good writeup for people on how to have a cheap trackie :p.

    After all, these bikes go for mebbe a couple of $k. If it were an 85, an 88 or a 90 I'd probably restore it and keep it clean, pristine and new; they're going to be *the* collectable early gixxers (85 being first year, 88 being the big change to different motor, and 90 being a change back to the different stroke motor + USD forks). The 1991s aren't nearly so collectable, being porky (due to the bodywork stuff), their only claim to fame is being the last of the oil pumping 750s.

    But I digress. I love gixxers and now I have an extra reason to bring back my gixxer cap :D.
     
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  11. QBNSpeedFreak
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    the 2000 went back to a 5.5 rear rim to save weight, pretty sure you k3 would have had a 5.5 as well, so how come there's a problem running 180's on the rear of this?
     
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  12. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    The only real problem is running a 180/55 gives you roughly the same profile on the sides, but slower on initial turnin, and you lose about 5mm of rideheight out of the back. You can fuck with the geometry somewhat, but then it turns in initially right but then really falls over... Powers are more than enough on something like this though :).

    Least that's my understanding of it all. Harder now that gixxer has been verticalscoped, kinda dead in the oil pumping section over in that part of the world.
     
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  13. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    To quote someone else: "OMG GIXXER IS AWESOME".

    Just took it for a lash on a couple of private test tracks. Oh man... it's still healthy. Brakes are better once de-glazed (though the lever is a bit long - comes good with a few pumps). The throttle returns but it takes a little bit of time before it settles back to idle - guessing a slight idle speed problem - which makes it exciting on the overrun into corners. And the tyres are so bloody slippery. It wasn't too bad with the odd little wag from the back, but, fuck off with the front end slides with it still almost upright.

    New tyres and it'll feel magic though. I'd forgotten how cleanly fuelled this one is, even from low revs, and it still takes off and absolutely sings at about 9.5krpm. Sounds good with that full system on, too, esp. with a nice crackle and pop on overrun. Just wish the tyres weren't squared off and slippery so I didn't have to be such a numpty.

    EDIT: To keep with my TGR membership... when I order braided lines, should I get them in lavender? Looks like one can!
     
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  14. Jono
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    Jono Guest

    Take note, because I'm about to say something sensible:

    That bike is too nice to put lavender lines on. I would get white, blue or silver.
     
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  15. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    Proper blue would be my actual lines of choice. More likely to match my hair :D. But once it has race bodywork on it, it won't look anywhere near that nice. And the bodywork is too good to give it rash now :). (though it has some minor rash already)
     
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  16. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    [​IMG]

    Not sure I can convince my brothers or their partners that I should be allowed to take my nephews (3 years, 2.5 years and 4 months old) and a niece (18 months old) on the bike, even with my latest mod.
     
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  17. Tsp3
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    Is that mod patented or can anybody use it? :whistle
     
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  18. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    Tsp3: Feel free. I'm sure Lib would approve too...

    Latest mod:
    [​IMG]

    OMG look - all in one trackday setup. Other track gear and tools in the ventura pack, and you could strap 20L of fuel down on the pillion seat too.

    So the real reason for this is to get the rear stand home. It looks dodgier than it is - the bottom can't fall any further down or around (held up by the ropes), and it's pulled fore and aft by some ropes under the ventura bag. Doesn't stick out any further at the back than a fully laiden ventura pack.

    There's actually plenty of room for me, too. I've already done a test ride to confirm.

    My 75L framed walking pack goes between the ventura pack and the arms of the stand. Also have some stuff to slip over the arms so they're a wee bit softer should the unthinkable happen. Then a wee little daypack on my own back, with clothes to take on the boat & my laptop, and I'm set :D.

    It's only got to get me to Melbourne, anyway...
     
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  19. Dough
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    That looks like a 'where there's a will there's a way' kind of mod..... :idea: :idea:

    To 'soften' the arms you could make a quick trip to the local hardware and buy some hot water pipe insulation... well that is what I did. :up :up

    Pete
     
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  20. Stout
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    Nice bike.

    What do you mean 'interesting handling characteristics'? I didn't realise they were 'underrated' - I should look harder for one! :ridgy If I could find an '85-87 model, I'd be all over it like a fat kid on a cupcake - like you said, they just kept getting heavier from there. Frankly, I lost interest in GSXRs by around 1991, though I'm sure the USD forks were a nice addition.

    Does it wheelie? :lol :lol Is a duck's bum watertight? They wheelie like a penny racer....
     
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