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Post by 90GTVert on Feb 15, 2015 12:50:12 GMT -5
The expander ring, the wavy one in the center should be installed with ends butted. If you look around at big piston manufacturer sites or in books, generally for large engines with bores more like 4", they basically all say 0.015" minimum for the rails (rings above and below the expander). Most don't give any spec per inch of bore. A. G. Bell however does say 0.004" per inch of bore minimum for rails in his book, Four-Stroke Performance Tuning. This gap is considered less critical and basically you just don't want to risk the ends butting on the rails.
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Post by isurffl on Feb 25, 2015 15:30:35 GMT -5
Sorry for being Mia for a bit now, but speed week is over for daytona... so it's back to the slow life for now until bike week, then it's time to hide the scooter lol. So I have since purchased and installed and almost done the "break in" period since this thread started. I would note to buy a package that includes all the studs if you have an older engine. I didn't have any complications removing them using two nuts tightened against each other, but I can see where many people might run in to a problem. I used the ride it like you stole it break in method. The way I see it, the scoot is set up to keep a pretty constant rpm range when riding so I figured that was the best way to break her in. I haven't gone over 35mph yet, but I feel more potential sitting there at 1/2 to 3/4 throttle. I've gone about 300 miles on the new engine. Definitely going to need some cvt work next. I feel like I'll have questions on the size of the outer diameter of some of the cvts offered, but I'm trying to get all the research in possible first.
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Post by isurffl on Mar 2, 2015 12:01:25 GMT -5
So new top speed 45.6 Average mph gps verified in almost no wind on flat ground. I find my speedo is accurate to 40 mph then is off by about to mph. Only bore kit 47mm, 5g rollers in stock variator, bando belt, 19mm keihein carb, k&n style filter with custom coffee can cover and of course I used the spark plug I found behind my stator in the custom Intake assembly. I did it for a better top speed!!! 1.15 main jet and idle jet that came in carb. and small boring on only the tail pipe tip. I noticed the outlet was smaller than the inlet but didn't notice any other restrictions on the exhaust inlet. Bored to match the I.D. of the exhaust pipe. The baffle didn't look very restricted so I left it intact. Now I notice I have an issue using the starter. I'm sure because of the increased compression the stock will no longer work. Is there a way to beef up the stock starter, or do I need to buy a bigger one? And what would be a good price for one, so far I can only find one and it's about $100.
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Post by stevec on Mar 2, 2015 13:36:52 GMT -5
you can run an 8 or 6 gauge wire from the battery to the solenoid and then solenoid to the starter and then an 8 or 6 gauge wire for ground from battery to a starter bolt.
whatever gauge you choose make sure positive and negative are the same.
you can also get a WPS lithium battery from scrappydog or ebay, make sure it is at least 200cca.
i stuck a high torque starter, 6 gauge wire and a 420cca lithium battery in my 190cc and it spins like a top.
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Post by isurffl on Mar 8, 2015 23:27:45 GMT -5
Turns out I needed to adjust the idle mixture screw to lean it out on start, but it seems I lost about 3-6mph on top speed and added a few seconds getting there in doing so
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