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Post by performancescoot on Sept 15, 2009 23:34:18 GMT -5
Hey There,
Just wondering if anyone is interested in a stroker BB build? I bought a "kit" with a 60mm stoker crank, 63mm bore and 4 valve head.
I've already ported the head and bored the block, but I've got photos of before and after so it's a little late for a complete build.
Just wondering if there is interest.
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Post by Rebel on Sept 16, 2009 1:12:57 GMT -5
The last price I saw on a kit like this was kind of rich. How much are you wanting for it.
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Post by performancescoot on Sept 16, 2009 9:13:40 GMT -5
It's not for sale, what I meant is a build thread.
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Post by kliff on Sept 16, 2009 15:07:56 GMT -5
Hey There, Just wondering if anyone is interested in a stroker BB build? I bought a "kit" with a 60mm stoker crank, 63mm bore and 4 valve head. I've already ported the head and bored the block, but I've got photos of before and after so it's a little late for a complete build. Just wondering if there is interest. And you're waiting for what? Start posting pics man! POST PICS, give with the info.....show and tell all you can.....PLEEEEEEEEEEZE.
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Post by theswede on Sept 18, 2009 8:10:34 GMT -5
I agree with Kliff, post it. Build threads are always interresting!
/Otto
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Post by Rebel on Sept 19, 2009 2:45:20 GMT -5
I think it is unanimous, we would like to see the project, we would like to know how it runs and if you did before and after performance tests, all the details possible.
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Post by performancescoot on Sept 19, 2009 8:47:47 GMT -5
Cool.. more to follow!
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Post by performancescoot on Sept 19, 2009 21:28:50 GMT -5
Okay, my camera died so I don't have all the photos yet, but here are some teasers. Here is the bike it's going into. Currently it's a 175cc with a ported and milled big valve head, stock carb, 9a cam and MRP style exhuast. It runs very fast even with a 150/70-13 rear tire. It will hit 50mph in a 1/10 of a mile or so, (I measure from a stop light to the corner of a building up the street). A stock bike runs about 38 at the same distance. The rear tire I'm running is 2 inches taller than the stock 130/60/13 tire, so this engine pushes this bike really well. Here is a photo of the kit I bought. 4 valve head, 63mm 4 valve piston, 60mm crank. This kit also came with a very high lift cam. The piston was made for the addtional stroke as they moved the pistion pin higher. I thought that was very cool as I was wondering how I was going to make up that difference. I have already disassembled the head to clean up the ports a bit from the casting, port match it to the aftermarket 30mm intake and to do a valve job. Not sure it needed anything other than port matching, but it didn't need much of that, but did need a little clean up. This is the specs of everything. 63mm Piston 60mm Crank 4 Valve head 30mm intake 28mm Flatside Carb Cone Air Filter 9 gram rollers Rear clutch shimmed 3/8 of an inch 835 Belt Calculated compression 10.38 I've already had the engine together and run, but do to an oil leak ( and here is a tip, NEVER COAT THE BASE GASKET WITH ANYTIHNG, JUST INSTALL IT) or it will leak. Lesson learned... first time I did this to see if it helped any... it didn't. Anyway, the build is going to be of the tear-down rebuild, so if you see a little carbon, that's why. I did ride it on the first build and home tonight from the shop after the rebuild, all I can say is WOW. This kit is done right! Granted I did a little work to the head, but not much and this thing hauls! I'm at 57mph at 1/10 of a mile building measurement I use. I let off becuase the road outside my shop were I time this on all our bikes is only 40mph and becuase my scoot looks like a crotch rocket to the police. I don't have a top speed to report, but I'm sure it's going to eclipse the 71mph I pulled with my old engine. More to follow...
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Post by kuzikood on Sept 21, 2009 20:38:05 GMT -5
sweeeeeeeeeeet
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Post by stradarx150te on Sept 23, 2009 19:28:31 GMT -5
Yep thats just about what i have !!
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Post by Enviromoto on Sept 23, 2009 22:56:43 GMT -5
Sure! Pics or it didnt happen
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usfmarine
Non-Com
SJA, Scooter Rebellion
Posts: 74
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Post by usfmarine on Sept 27, 2009 0:08:31 GMT -5
How much was the kit, and where did you buy it?
Also, detailed how-to porting info with photos would be much appreciated. Before/after photos would be ideal. Be sure to tell us what tools/tips you used to do the mild porting.
That's my request, if you have the time.
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Post by kuzikood on Sept 27, 2009 12:53:53 GMT -5
i second that marine
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Post by kliff on Nov 1, 2009 8:41:30 GMT -5
How about some updates, pleeeeeeeeze!
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Post by performancescoot on Nov 5, 2009 19:20:47 GMT -5
Sorry everyone! But here are a couple of photos anyway so you know it's real. My camera at the shop died that day so I used my buddy's phone and he deleted most of the photos before sending them to me. So you'll have to take my word for it that it's in there. I'll snap some photos of it installed in day or two. Anyway, the reason I torn it down after the first build is becuase I was having trouble keeping the oil in it. I had a balance tube between the oil fill tube and valve cover connected to an oil catch with a breather attached to that and it would pump half the oil out on a high rpm run and was blowing oil everywhere out the breather and valve cover gasket. It worked perfectly on my last engine so I had no idea why it was doing this. I couldn't figure out the problem, so I dumped the oil stick tube and just ran a tube to a catch can and then a breather. Still did the same thing, so I torn it down figuring something must be wrong inside with the oil pump or passages. So I resealed everything, and low and behold, still pushing oil out the beather. I ended up fixing this problem by installing a PCV valve. It goes from a hose on the valve cover tube to an oil catch, another hose out the catch to an inline PCV valve to a hose connected to the vacuum port on the intake. I was a little freaked out on my first couple of rides thinking I was going to dump oil into the engine via the intake, but it turns out that negitive crankcase pressure is the ticket to these engines! I've got about 75 miles so far with this set up and this engine does not leak a drop of oil, oil vapor is non-exsistant and it hauls ass! Anyway, here are the photos of the "build". First is my block, did it with a dremel and lip-stick. Grind it out close, then coat the sleeve with lipstick and install it and where there is red, grind. The second and third photo is the cylinder head and pistion, I had richened up the carb a lot thinking it being a new engine and trying to lower the temp a bit hoping that would fix the oil problem which is why there is some heavy carbon there. The last photo is of the crank. It looks like a stocker, but it's not.
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