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Post by dexameth on Aug 20, 2018 12:28:45 GMT -5
I hope you were thinking about this kit (:
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Post by magoconnor on Aug 20, 2018 12:57:35 GMT -5
Yup thats the one. what main jet size would be a good starting point? I bet those bigger valves suck up the juice pretty good.
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Post by dexameth on Aug 20, 2018 13:06:11 GMT -5
Depends on the carb really. I use a 112 main with the 24mm setup I have, but I'm at sea level in Florida. I used a 95 main with my 19mm carb when I did the first speed run.
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Post by magoconnor on Aug 21, 2018 15:47:02 GMT -5
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Post by fugaziiv on Aug 21, 2018 15:50:47 GMT -5
Arisal tests this kit with the stock head, so yes, you can go ahead and use your stock head with the Airsal kit. That sweet domed piston is designed to get optimum compression with the stock head. Matt
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Aug 21, 2018 18:24:33 GMT -5
Just wondering, have you seen the actual bore size on this kit? I hate the way they rate these things.. if it really gives a 15.5 to 1 compression ratio, I can’t I manage how you could get fuel to keep it from knocking. The only thing I don’t like about the kit is that it uses a Nicasil cylinder. I like the cylinders having the iron liner. If you eat a bunch of dirt, and need a ring job, with the iron liner you can hone it and put in new rings. With Nicasil cylinder, your buying a new cylinder.
Of course most of these BBK upgrades are considered throw always, but old likes die hard! To put it in perspective, I hone the cylinder just about every time I have the head off.
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Post by magoconnor on Aug 22, 2018 7:02:02 GMT -5
I plan to use a larger head so the compression ratio will be lower.
I have just orderd the airsal kit thanks to your fine help.
Im about to purchase the a9 cam, Im just wondering if it will give me valve clearence issues? Im a little unsure, but the a9 cam shouldn't provide more lift right? just longer duration.
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Post by dexameth on Aug 22, 2018 8:33:28 GMT -5
I plan to use a larger head so the compression ratio will be lower. I have just orderd the airsal kit thanks to your fine help. Im about to purchase the a9 cam, Im just wondering if it will give me valve clearence issues? Im a little unsure, but the a9 cam shouldn't provide more lift right? just longer duration. I measured my old Growsun A9 and it's slightly larger than the SSP-G cam I sell. The A9 was claimed to have higher and longer duration lift which could possibly lead to piston/valve clearance issues. I did some measuring on our SSP-G cam and it has the same lift height but the lobes are timed better for earlier opening of the intake valve and later on the exhaust. I felt a big increase in low end when I tried the SSP-G cam but mid/high wasn't noticeably different. I don't know the duration differences of the SSP-G cam vs stock or A9 but I do like it. I was running the A9 when I had the 50mm kit with the big valve head and I didn't have any clearance issues.
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Post by magoconnor on Aug 22, 2018 9:59:42 GMT -5
I was thinking about using the glixal a9 but I dont have any specs on it.
I dont know if the camshaft will work with airsal piston and the big valves. But maybe someone on this forum have tried it?
You meassured the valve relieve (airsal piston) to 22mm. And the valves I have is 21,5mm, so as you said it should work.
But squeezing in a glixal a9 cam, its gonna be damn tight.
Im still using the stock crankshaft, so the stroke is the same.
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Aug 25, 2018 9:56:28 GMT -5
The generic A9 cam is not a very “wild” cam. I. Would be willing to bet it will work just fine. I would assemble it and set th e valves. With a used head gasket and some small chunks of modeling clay on top of the piston to check, (advance it SLOWLY, by hand) the one I would be worried about most is the intake valve. When we were building Walt’s bike ( 50 mm BVH) the intake was uncomfortably close for us, but remember we decked the cylinder and milled the head to “ clean” them up. We just set it up and ran in a end mill to get some extr a clearence, but I don't think it would have been necessary with a stock deck height
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Post by magoconnor on Aug 25, 2018 11:13:51 GMT -5
The possible trouple maker would be the dome piston. The piston is 0,5mm taller, I dont know if that small amount of increase in hight, could even be concidered and issue. Thou I know it does not work, when using a stroker crank. Here is a link to the piston: www.partsforscooters.com/158-4-Airsal-Piston-Kit-50mmBut what I would very much like to see was some specs of glixal cam, is a shame none is provide by the seller.
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Aug 25, 2018 12:12:47 GMT -5
Well wait until I’m back Sunday. I’m re measuring those cams and this time I’ll make sure on the lift. I’ll try to make a set up to measure t the valve as wall.
This weeken I’m teaching Walt how to drag race. I’m puttimng him on the 600 n drag ser up.
the striker cranks I have seen have a full length rod, which means the builder has to set the deck height. Where that is set would make a huge difference in valve clearence
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Post by magoconnor on Aug 25, 2018 13:16:31 GMT -5
Okay cool man Do you know if one of them are a glixal ? How fast do you go on such a beast?
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Post by magoconnor on Aug 25, 2018 16:30:18 GMT -5
What size carburetor would you guys recommend?
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