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Post by 90GTVert on Nov 27, 2013 21:24:18 GMT -5
I used stones/cutters to enlarge the combustion chambers on mine. First one I ever enlarged I had a machinist do for about $20. I have been shooting for about 7:1 corrected compression ratio lately. Working well on the street for me, but you could push it up some and be more aggressive. Sometimes I just check with a compression tester and look for 150-180psi. 49ccscoot.proboards.com/thread/5043/calculating-stroke-compression-ratios |
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Post by scoottrash1990 on Nov 28, 2013 11:56:11 GMT -5
thanks brent....i just did a compression test...with 2.49mm of squish i have 130psi of compression....i took the head gasket out...with it out i have 2.0mm of squish and i am getting 140psi of compression....my starter is having no issue turning it over with 140psi compression....im thinking i need to take about 1mm off the head....
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Post by 90GTVert on Nov 28, 2013 12:31:14 GMT -5
Prob a good bet. Then if comp is too high you can add a head gasket back in. Copper ones are a little thinner too if you can find one.
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Post by scoottrash1990 on Nov 28, 2013 14:24:00 GMT -5
well i took the head to my buddys house and shaved 1mm off of it on the lathe...i made a gasket out of a pop can...my squish is now 1.23mm and my compression is 160psi....much better....the starter is a wee bit slower but still turns it over fine....i think i found the sweet spot....i have a few pics i will post when i get a chance to upload them...thanks again Brent....have a happy Thanksgiving...
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Post by scoottrash1990 on Nov 28, 2013 22:03:07 GMT -5
here is some pics to update everyone on what i'm doing... its cold ans snowy here in Ohio and i don't have a heater for my garage so i pulled the scoot in the kitchen to do some work on it....one of the benefits to being single....   the other day i had some free time on my hands at work so i figured i would make a boost bottle out of stuff laying around the shop...this is what i came up with...    the bolt in the end is to adjust the volume of the bottle....   setting the head up in the lathe to shave it down to get the the squish and compression where i want it...  shaved 1mm off...  gasket made out of a redbull can...i guess you could say i gave my scoot wings...lol..puns  squish is 1.23mm and compression it 160psi...  this is where im at right now but im putting an order in for parts tomorrow... |
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Post by 90GTVert on Nov 28, 2013 22:33:38 GMT -5
The Triton looks great. Think that's the best pic I've seen of it with those lights. Really like it.
Don't expect a lot from the boost bottle. I dunno that you'll be able to tell anything adjusting volume.
Should be a lot stronger setup like it is now.
Wonder what's coming next?
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Post by kevin55950 on Nov 28, 2013 22:51:18 GMT -5
I found that this kind of aluminum waves in no time... At least, I got a huge head leak because of this when the zuma was on the road..
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Post by scoottrash1990 on Nov 29, 2013 0:26:06 GMT -5
thanks Brent....i just put my order in with RP...that 15% discount sure was nice....i will update everyone on the new parts when they come in....
kevin, are you talking about the pop can gasket? i think you were the one asking what needle i had in my dell 21mm in my earlier posts....its a w16...is this any good for a street scoot?
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Post by kevin55950 on Nov 29, 2013 7:08:49 GMT -5
I'll take a look on the chart, and yes this aluminum seems to weave once it took some heat.
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Post by scoottrash1990 on Nov 29, 2013 11:58:27 GMT -5
thanks kevin...what would you suggest using for a head gasket? the aluminum ones i can find are to thick...
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Post by scoottrash1990 on Nov 30, 2013 12:17:24 GMT -5
i got 1 of my new parts in yesterday...   |
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Post by 2strokd on Dec 1, 2013 13:29:02 GMT -5
I am pretty sure the W16 is the same taper as the W6 but the overall length is shorter? Been awhile since ive looked myself but i have used that needle in a street set-up. Usually W6-7,s
Sweet ride!
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Post by scoottrash1990 on Dec 1, 2013 16:14:39 GMT -5
thanks 2strokd.....i am running a dell 21mm carb and it has a straight nipple thing that comes off the top of the carb where the throttle cable comes in...i need a 90 degree one.....does anyone know where i can get them at...i also need one for the choke cable....
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Post by 2strokd on Dec 2, 2013 9:26:04 GMT -5
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Post by scoottrash1990 on Dec 2, 2013 17:08:36 GMT -5
thanks 2strokd....treatland had them....the one from my stock carb is a little messed up and i needed one for the choke....the choke binds up because the cable is pushing against the seat bucket.....
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