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Project Yamaha R1-Z 250 YPVS in England

Discussion in 'Your 250cc Projects' started by Alfiestorm, Feb 13, 2021.

  1. Alfiestorm

    Alfiestorm Well-Known Member

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    My Bike:
    Yamaha R1-Z 250 YPVS 1990, Suzuki GSXR1100L 1990, Suzuki RG250 Gamma 1983
    These were as far as I know JDM only.
    I bought it from an importer in the UK in April 2019 in need of a complete engine rebuild and all the rubber bits replacing except the radiator hoses they were good and got it on the road in July 2019.
    It only had 9k on the clock but had been stood for many years in Japan.

    After getting it on the road in standard trim it was time to start thinking about making an already fun bike even more hilariously fun bike for a 250.

    1. So heres what I have done so far.
    2. YSS suspension back and front.
    3. Michelin power RS tyres
    4. Fork brace from Taiwan but most likely China, changed the chocolate bolts for stainless ones apart from that its well made and works well.
    5. Martin Johnson chambers (bloke in Devon makes them) with TYGA cans.
    6. Changed out the restrictive 26mm TM carbs for two 28mm TM carbs from DTR 125's.
    7. Polished the cylinder head domes
    8. Cleaned all the rough casting lumps and bumps from the transfer ports and smoothed them and knife edged the web.
    9. Removed the hump in the exhaust ports and removed casting marks then polished the ports.
    10. Removed the snorkel or pig nose from the airbox.
    11. Barend mirrors fitted, they look a **** load better than stock and suit the bike well I think.
    12. Carbon reeds.
    13. Removed the KMH speedo and fitted an MPH one from a TZR125, it was a straight fit in the case.
    14. The carb jetting is 260 main, 35 pilot and needle clip is central.
    The result is a bike that handles very well around the bends and goes very very well in a straight line too.

    I decided not to have the bike re painted as I like the look of its crusty appearance and the small dent it has in the tank.
    The rusty bits I treated with Kurust to neutralise it. I had to paint the wheels as the original finish had corrosion from when it was standing for many years.

    20200711_202339.jpg 20200711_202351.jpg 20200712_114323.jpg After.jpg Before.jpg during.jpg ex port hump gone.jpg ex port hump.jpg in standard trim.jpg Plug burn colour.jpg Polished domes.jpg 20200618_114316.jpg
     
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  2. CobraBaz

    CobraBaz Well-Known Member

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    My Bike:
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    Nice Ride :p
     
  3. kiffsta

    kiffsta Senior Member

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    Congrats on owning such a cool bike, I have been looking for years , they rarely come up for sale here in Oz
     
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  4. Simon

    Simon Well-Known Member Premium Member Contributing Member

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    My Bike:
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    Peach!! Ultra rare here in the UK too :)
     
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  5. Alfiestorm

    Alfiestorm Well-Known Member

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    My Bike:
    Yamaha R1-Z 250 YPVS 1990, Suzuki GSXR1100L 1990, Suzuki RG250 Gamma 1983
    I kind of got it by accident as I didn't know they existed. I used to own a Suzuki x7 3 or so years ago that I done a restomod on and sold to fund stuff on another bike.
    Then I needed another two stroke in my life but it had to have power valves RD LC'S, TZR'S, RG, RGV, NSR and as far as I was concerned they were and still are overpriced but then I am a tight git at times.
    I had all but given up until scanning eblag one day and came across four R1-Z's for sale, three of them were around the 3 to 3.5k (£'s) except the one I have now was on low bids so I punted a max bid of £2010 an thought no chance and forgot about until the eblag notification came through I won the bid at 2k and another £800 getting it road worthy and registered. On the road for £2800 in 2019 a true bargain in the UK anyway.
    Spent crap loads more money and time on it since but that was my choice. Very underestimated bikes.
     
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  6. Alfiestorm

    Alfiestorm Well-Known Member

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    My Bike:
    Yamaha R1-Z 250 YPVS 1990, Suzuki GSXR1100L 1990, Suzuki RG250 Gamma 1983
    Not many on our roads, not seen another one on the road except now one of my mates has just got one from Essex area. Great bikes
     
  7. Alfiestorm

    Alfiestorm Well-Known Member

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    Thanks mate
     
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  8. CobraBaz

    CobraBaz Well-Known Member

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    Sounds similar to me with my Cobra M8,,,,rare jap import to!
    im in UK :)
     
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  9. Alfiestorm

    Alfiestorm Well-Known Member

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    My Bike:
    Yamaha R1-Z 250 YPVS 1990, Suzuki GSXR1100L 1990, Suzuki RG250 Gamma 1983
    Since the original post I have added a top yoke mounted steering damper, 4" Brembo rear wheel from a Yamaha SZR660 which allows me to fit a 150 section tyre Michelin power RS, the wheel is a straight fit no different spacers of anything needed.
    New gold fork stanchions from Japan as the right fork leg always leaked a bit no matter how may times the seal was replaced and there was no physical damage to the stanchion, all sorted now 20210310_162544.jpg 20210310_162559.jpg 20210310_162634.jpg 20210310_162716.jpg
     
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  10. Alfiestorm

    Alfiestorm Well-Known Member

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    My Bike:
    Yamaha R1-Z 250 YPVS 1990, Suzuki GSXR1100L 1990, Suzuki RG250 Gamma 1983
    Here is a little clip of the bike doing it's stuff

     
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  11. Alfiestorm

    Alfiestorm Well-Known Member

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    Hello all its been a while been busy out on the bikes having a laugh, I have bought a Yamaha szr660 yeah a single pot four stroke made to look like a TZR250 3MA using 3 MA body work. I bought it for parts the bike its self has a low k's engine which is in good shape.
    I got it for the USD front end, the szr is a single disc front but this one had been converted to twin disc with Brembo calipers so that is going on my R1-Z with a few other bits and the rest is being sold off.
    Here is a couple of photos of the donor SZR660.
    I have already stripped the bike down. s-l1600 (1).jpg s-l1600 (2).jpg s-l1600 (4).jpg s-l1600 (7).jpg
     
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  12. GeorgeT

    GeorgeT Active Member

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    Nice bike.
    Congratulations. My son is an R1 fan and has had several...still rides one. I am interested as to what difference you got by using 28mm carbies instead of the 26mm. I have thought about that on my SRX250 Yamaha but because the inlets at the head are exactly 26mm I thought that would already restrict any better performance by using bigger throat carbies. I know from experience that it was possible on a BMW R100/7 that I used to have. The performance was improved by using larger Dellorto carbies as long as you replaced the pistons also with higher compression ones. I basically turned the R100/7 into an R100S as far as the motor was concerned.
     
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  13. Alfiestorm

    Alfiestorm Well-Known Member

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    My Bike:
    Yamaha R1-Z 250 YPVS 1990, Suzuki GSXR1100L 1990, Suzuki RG250 Gamma 1983
    The main reason for changing the carbs was the original 26mm ones did not have air screw adjustment they relied on air jets which is a pain for fine tuning.
    As for performance not really 100% sure but it sure does rip at the top end without sacrificing mid range compared to the 26mm carbs, that may have something to do with all the other modifications and improvements I have done as well.
    I need to get it on the rolling road to see how much power it makes and where to see if there is room for improvement.
    It really does feel strong and revs to the moon and back.
    In standard trim they are supposed to produce 45bhp according to Yamaha and I guess that would be a crankshaft measurement.
     
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  14. Alfiestorm

    Alfiestorm Well-Known Member

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    Yamaha R1-Z 250 YPVS 1990, Suzuki GSXR1100L 1990, Suzuki RG250 Gamma 1983
    Test fit the SZR660 front end, only need to change the bottom stem bearing as it is taller than the R1-Z bearing other than that the bearing is the same dimensions.
    Will not be using the SZR handle bar arrangement as the riding position is arse in the air and face in the clocks so a top yoke conversion will be done.
    Son as the handle bar issue is sorted it will be time to fit the original R1-Z headlight and clocks with all it original brackets and paint the mudguard a subtle metallic black.

    A few photos of progress so far, just waiting for new bottom stem bearing and some bar risers. 245589421_197424475852067_23981197177546945_n.jpg 245602136_197424605852054_3565304499779316806_n.jpg 245989835_197424555852059_934692411582350000_n.jpg
     
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  15. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Very interested to know the details of that front wheel twin disc conversion as well as the bolt spacing on those brembo calipers
     
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  16. Alfiestorm

    Alfiestorm Well-Known Member

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    Best way to explain it is, The front end is a standard set up off of the Yamaha SZR660 which has a single disc set up as standard and the disc being on the right hand side, however Yamaha for some reason just blanked off the left side of the wheel with a plastic shroud covering the already threaded bolt holes for another disc to be fitted, they also fitted the left leg with all the castings for the caliper to be mounted with the only work needed was to drill out the caliper mounting holes. The caliper mount centres are 40mm
     
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  17. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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  18. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Excellent response - thank you -some times late at night I trawl the net looking for 3" twin disc front wheels - every thing in that width is running single discs nowadays and the castings don't have facility for the disc on the other side - at least this gives me a candidate.

    I wonder which bike came equipped with that wheel and both discs as standard
     
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  19. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Check the part number of the front rim on the diagram, the first prefix is the Yamaha model code. Look that up and it will tell you which model it was originally from.
     
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  20. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    A pair of Yamaha MT03 660 wheels would be nice for what I have planned - but they're rare and commanding silly prices, most listings with the discs and sprocket carriers removed, which means the price just went up further unfortunately

    I've hopefully got a pair of wheel from a Hyosung GT250r - 3" front, 4" rear as a stop gap
     

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