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    SCD Racing

    A while back someone asked the question, where all the brotherhood and camaraderie went around here. It left when people who are getting rolling get bashed for being competition. Ken, if in 1985 someone had "looked in" on your operation, would they have seen the operation it is now? I highly...
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    SCD Racing

    Per the user agreement, commercial signature links aren't allowed so here's the thread about it! I launched a website at the beginning of the year to showcase some of the work I've been upto! SCD-RACING is the place. I've posted pictures some of the blaster, polaris, and banshee work I've...
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    Piston Boost Port

    Optical illusion. It's the edge of where the coating that comes on them had rubbed off on the thrust face. Considering I don't EVER warm that engine up, it wouldn't be surprising if it was a little scuffed anyway, though.
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    Piston Boost Port

    I'm fairly sure that's not a boost port, that's just a piston for a YZ400. I've never worked on a hillshooter (or seen a successful blaster hillshooter). I have seen banshee engines disassembled that were used for that purpose and had piston boost ports cut into them (added to stock style...
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    Piston Boost Port

    I don't use cast pistons or recommend them to anyone else. It's how I get my case repair jobs, actually... so please continue to recommend them. My thoughts on piston boost ports without any other modifications: You won't feel much of a difference if any at all. You're not increasing volume...
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    Piston Boost Port

    No, it'll just explode in the bore and take out the cases and crank. MUCCCHHHHHHH better. 8-| 8-|
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    Piston Boost Port

    Ok, at that angle it's much clearer. It looked in the first picture series to be aluminum spalling off almost dead in the middle of the piston (like it was seriously hot and starting to melt though). The carbon on the bottom of the crown concerns me a tiny bit but real bad. If that's an...
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    Piston Boost Port

    That first piston picture, it definitely has a "hot spot" right in the middle. Was it lean?
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    Big bore rdz drag pipe

    What are you interested in? I've got a bunch of parts here that might tickle your fancy....
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    wwholden's head mod and arbor

    Be careful with squish areas north of about 60% of the bore area. During my experiments I cut a head which, by volume was acceptable but had a 65% squish area (deep combustion chamber) to try and get more "torque" from the motor. The head would detonate in mid rpm (as predicted by the head...
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    clutch issues

    The clutch "pack" itself MUST start and stop with a fiber disc. There should be 7 fibers and 6 steels with ONLY fibers touching both the inner clutch hub and the pressure plate
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    Exhaust power valve...i was thinking about making one that...

    You want to go wild and crazy? I was thinking about trying this on a custom headpipe. The idea is to basically add a "boost bottle" to the section of the exhaust tuned pipe where the charge resides after the pipe pulls the charge out (before it stuffs it back into the exhaust port) with a...
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    Exhaust power valve...i was thinking about making one that...

    The FTZ's are complete replacement cylinders. CP industries replacement cylinders for banshee's also have powervalve options. Another thing to think of here, is the decrease in cooling capacity that will result from installing something in front of the exhaust port. The banshee head and RZ350...
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    Exhaust power valve...i was thinking about making one that...

    Adding a powervalve to an engine that is not equipped with one isn't a "K.I.S.S" situation.... There will be a LOT of engineering involved. The vacuum actuated models are the most prolific (Rotax "RAVE" valve) but not as well controlled as mechanical (goverened) models. Simple spring loaded...
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    Polaris question

    It's most likely the failed choke cable that's causing the hard starting condition and nothing more. I recommend a leakdown test just to make absolutely sure that's not an issue but I doubt it is....
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    Exhaust power valve...i was thinking about making one that...

    The LT250 and LT500's used a chamber hidden in the case and an opening under the exhaust port that changed the characteristics of the pipe. It wasn't as effective in modulating the powerband as the YPVS or KIPS systems but it did work. Those systems raise the exhaust port roof to increase port...
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    Polaris question

    It's the standard ugly polaris trailblazer but it looks like it's in decent shape.
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    how well do u know blasters

    There's something really odd about that frame. The tubes that come down in front of the engine look like they don't come back as far as they should and the tube that comes down around the back of the engine doesn't stop on that one, it comes down into the rear subframe area. Is that a Kasea...
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    how well do u know blasters

    There's one that was posted in the chatbox the other day on CL with a 6.5hp clone engine on it!
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    Any idea what pipe this is?

    FMF Fatty? You'll need a cylinder adapter to use it. They're about $25 from FMF if I recall correctly.