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1987 Honda CBX250 Project

Discussion in 'Your 250cc Projects' started by Kerz, Oct 16, 2013.

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  1. risky

    risky risky

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    cb750 f2n is one of my bikes and the shocks look the same nd i get a better ride than my monoshock bikes. if you are worried about the eye holes get a friend with a lathe to turn some bushes from industrial nylon or urethane. to turn urethane it helps to be frozen.industril nylon comes in various diameters on the o.d. so needs shaping and counter bore the centre. will give a harsher ride but never wear out.. last time i bought some cost about a dollar an inch.6 inches should do your4 bushes.if your can make a mould urethane can be melted and poured.
     
    risky, Nov 6, 2013
    #101
  2. Phil

    Phil Senior Member Contributing Member

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    I agree, a year or so back I caught up with the team from Rad and was given a lot of great info and some good prices for the services they offer. Give them a try, nothing ventured, nothing gained.:thumb_ups:
     
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    Phil, Nov 6, 2013
    #102
  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I agree with u in keeping the original shocks for coolness .... definately worth contacting those guys and Im sure they will advise u whether they are worth a rebuild or not.
     
    GreyImport, Nov 6, 2013
    #103
  4. risky

    risky risky

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    checked my shocks and they had a transfer on back....showa made by honda. i think they are an ohlins copy.
     
    risky, Nov 6, 2013
    #104
  5. Kerz

    Kerz Beginner level grinder :)

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    So it's decision time, I spent a bit of time last night starting to make the mold for my seat. You can see from the picture that it sweeps up quite a bit. I want to know whether you guys think this is ok, or whether I should try and hide the sports frame look. I like it the way it is, but it's not "traditional." Let me know what you think.
    [​IMG]
     
    Kerz, Nov 7, 2013
    #105
  6. risky

    risky risky

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    beauty is in the eye of the beholder. maybe a little wider at back to come down and cover frame? consider comfort.
     
    risky, Nov 7, 2013
    #106
  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Mold looks good
    What u need to do though is set the frame so it sits as it would be with the suspension and wheels on
    1 for overall looks when completed and 2 to see if your butt will sit within the comfort zone for riding.

    If u look at the centre bar in that pic its level (if not pointing slightly downwards) to the floor whereas if u look at your pics (and early ones from that thread I linked earlier) when the bike was together the centre section is pointing upwards...... which is a good thing as it means the front should be higher which should level the seat out a bit.

    Does that make sense ? :D

    Maybe use the old seat to get an idea of the angle where u sit

    Have u got any pics from behind?

    Hey can u cover up that fluro light show pushie in the background next photo session......:lolsign:
     
    GreyImport, Nov 7, 2013
    #107
  8. Kerz

    Kerz Beginner level grinder :)

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    Haha yeh I thought that when I was lookin at the pics, I will elevate the front of the frame a little a see what it goes like then. Btw I put in my swingarm, both triples, rear brake lever, handlebars & kickstand in to be powdercoated this morning. Managed to squeeze into the within 24 hours cook for $80. They'll be ready in the morning :) I think the frame won't be done until near the end when I'm happy with all of it. Actually does anyone know what the deal is with the rear hoop? Do you have to maintain standard frame length or can it be shorter/longer than stock?
     
    Kerz, Nov 7, 2013
    #108
  9. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    What is tradition? That is just doing what everybody else has done. :prankster:
    You build it how YOU want it to be, after all you are the only one you have to please. :imtheking:

    Anyway it looks good to me. :thumb_ups:
     
    Murdo, Nov 7, 2013
    #109
  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I think you have a good idea about leaving the frame until last. Something will surely pop up to ruin your finished product if you jump in and powder coat now.

    Grey's idea about getting the bike sitting like it will be in real life sounds good too. When you are going to go to this much trouble then you should spend the time to get it right.

    As it sits I think the seat has too much slope on the base, the banana effect that you alluded to. But I think you already feel the same way. Perhaps you could do the mock up, take some photos, and use photoshop or similar to draw some shapes. I like what you said about making the seat loop to suit the seat and rear guard. If you have a large gap it always looks like someone just bolted a badly fitting seat to the bike.

    Here are some pics of '70s bikes. Notice how the Ducati seat and rear guard blend with the seat loop. In the case of the Laverda, the seat fits over the loop. You can experiment and decide which way you prefer, but for the little bit of work involved to finish the loop correctly, it is definitely the way to go. Just my two cents worth of course.
    Keep up the good work.
    ducati_gf.jpeg laverda-3c.jpg
     
    maelstrom, Nov 7, 2013
    #110
  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Ok that is a really bad pic of the Ducati seat. Try this one.
    Ducati_750-SS.jpg
     
    maelstrom, Nov 7, 2013
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  12. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Those SS Ducati seats are about as comfortable as they look. Commonly referred to as a 'vynal covered board'.
     
    Murdo, Nov 7, 2013
    #112
  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I was riding back to Brisbane on my 750SS from Cairns. My kidneys were beaten to a pulp, and every time I saw what looked like a smooth piece of bitumen (rare in those days) I would stick my arse back on the seat and exhale. Then BAM, hit another pothole and the burning pain rips through my mashed kidneys again. Yes, I know something about that which you speak of Mr Murdo. :D

    Sorry got off topic there Kerz. Now where were we?
     
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    maelstrom, Nov 7, 2013
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  14. risky

    risky risky

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    as i said.. a little wider at the back to come down and cover the frame.put your electrics in it for smooth look.
     
    risky, Nov 7, 2013
    #114
  15. Kerz

    Kerz Beginner level grinder :)

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    So I got my swingarm back from the powdercoaters today and they ****** it. At the fwd end where the pin goes thru some of the powdercoat didn't take but that's the least of my worries. The fuckin idiots managed to put something bloody heavy on top of it and bent the **** out of one of the shock mounts. I'm not sure it's repairable, but I'm ******* irate about it. The problem is I picked it all up as they were closing so I didn't see it until I got home. I rang but no answer so I left a message on the machine. Also I have pictures of the swingarm after I sandblasted it before I handed it in and the mounts are perfect. I just don't want to cop the "oh it was already like that" bullshit. Anyone had anything like this happen.
     
    Kerz, Nov 8, 2013
    #115
  16. Kerz

    Kerz Beginner level grinder :)

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    Took the swingarm in and they're going to fix it, not willingly. I priced a new swingarm @ $500, lucky I guess.
     
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    Kerz, Nov 9, 2013
    #116
  17. Phil

    Phil Senior Member Contributing Member

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    Good luck, keep us posted on the outcome.
     
    Phil, Nov 9, 2013
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  18. risky

    risky risky

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    i believe they had no choice but to fix but check the repair to see the swing arm not twisted.
     
    risky, Nov 9, 2013
    #118
  19. Kerz

    Kerz Beginner level grinder :)

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    Hey guys, I know it's been a while since I posted anything. This project has not died, repeat HAS NOT DIED! I just finished re-reading through this thread and you all have my apologies for my frustrated outbursts. Gotta love motorbikes right.
    Since last year I haven't done much to the cafe racer but I'm ready to get into it this year, also just wanted to let you know that they fixed my swingarm free of charge (so they should have), and that the honda dealer told me my rear shocks are non-servicable and a new set would cost $600 -_- I believe it was this single statement that removed my scepticism for aftermarket parts.
    So due to the 2½ month hiatus I now have parts everywhere and a wiring loom, and I think that I'm in for it. Some things are labelled and grouped but I think I should have gone into more detail.
    Also has anyone ever seen a cafe racer with a seatloop that kicks down instead of straight or up, I thought it might be a nice little detail.
     
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    Kerz, Jan 22, 2014
    #119
  20. risky

    risky risky

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    good to see you are back on track.
     
    risky, Jan 22, 2014
    #120
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