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Thread: East Van Camel Hump

  1. #241
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    Engine stuff

    Today I dropped off my battery tray to get welded. Tory can do this if my shop neighbour is too busy.
    He has my engine all apart now. He plunked the crankcase cover in his ultrasound cleaner but it came out
    grey & sooty. It just rubs off & I'll be bringing it to get hydra blasted so I'm not bothered. It's probably the clear coat.

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    He found another couple battle scars. The piston had a chunk of it broken off as well as some good scuff marks.

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    It's got this nice crack on one of the lower engine mounts.

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    From what I understand cast aluminium can be difficult to weld & will probably break again. I think I'll be using my spare set of cases.

    One thing that caught Tory's eye is the punch marks near the serial number. Doe's anyone have any insight on this?

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    Steve
    Last edited by rotatorpotator; 02-07-2018 at 10:38 PM.

  2. #242
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    Back in the day it was common for Yamaha to request the dealer to put a punch mark, as such,when a update had been done ,or sometimes when a major warranty claim had been done.
    Does the frame number also have punch marks?
    Do the frame and engine numbers match?
    the work did not have to be on the motor,The punch mark was so any dealer could tell at a glance if the work had been completed.

  3. #243
    The cases need to be evenly pre-heated prior to welding...otherwise they can crack by themselves again after welding.

    SR
    ...'Any unnecessary items on the bike, that it doesn't really need, shouldn't be there!'. (Café racers creed). SR..

  4. #244
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    The frame & engine are matching numbers but the frame doesn't have any punch marks.

    As for trying to repair it I'm gonna lean toward the safe side & use this nice set of cases I bought just in case.
    I picked em up just after I bought the bike as I had a feeling. They are low mileage. I believe it was around 6K.

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    I was hoping to have a numbers matching bike but that's not as important to me as reliability. The original ones will
    find a place on a shelf for the time being. The spares are even earlier in the production run.

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    Steve

  5. #245
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    Non vacuum petcock

    I ordered up a kit to convert my petcock to non vacuum. I had done some reading on the old forum but for some reason it wasn't entirely clear to me.
    The kit is just a piece of aluminium & a gasket with instructions.

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    The instructions are as follows. Open up back & remove spring & diaphragms. Open up front & tape over lower hole.

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    Epoxy or JB Weld hole closed from back.

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    Reassemble minus diaphragms & spring using supplied plate & gasket. That was easy.
    I chose to reuse the original back piece as I prefer the factory look. I may lob off the unused vacuum spigot.

    When I first refurbished the petcock I had replaced the parts & made things pretty but now I have a better understanding of how
    all the passageways work.

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    Steve

  6. #246
    Senior Member gcrank1's Avatar
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    The petcock and oem backplate also have an air bleed hole for the backside of the diaphragm (allows diaphragm to not 'lock up'), the new gasket should block it off but look for it and consider some epoxy for it also. On mine the vent comes out on the frontside, top/right of the handle plate just under the mounting boss. It is a small hole and easily not seen. IIRC on the backplate the vent is in the pocket for the spring? I missed it and had a dribble after the button-up and run.....
    Last edited by gcrank1; 02-16-2018 at 11:24 AM.
    '81 Yamaha SR500 Caff Racer
    '09 Suzuki TU250X 'The Silent Red Fellow'
    '98 Honda Shadow 750 ACE Deluxe
    In all things maintain your uprightness lest the road reach up and smite thee

  7. #247
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    Thanks gcrank1,

    I would have done the same thing & given the bike a gas bath. I thinks that the instructions should mention this.
    This is the little hole you're referring to?

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    Gonna plug it.

    Steve

  8. #248
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    Tiny Hole

    Upon further investigation I don't think the little hole would be a problem. The gasket covers the entire back & will seal off the hole.

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    But I plugged it anyway.

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    Steve

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