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Post by oldgeek on Oct 2, 2016 16:02:56 GMT -5
Nice man, thats some good speed for a low end 70! Like the bars, i have a stem. BUt dont have any bars. Makes me want to swap mine! For generic 70cc kit and a 300lb payload it is pretty good! |
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Post by PIG on Oct 2, 2016 16:22:17 GMT -5
I feel like there's going to be more speed coming soon  |
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Post by oldgeek on Oct 2, 2016 16:27:38 GMT -5
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Post by ryan_ott on Oct 2, 2016 16:30:28 GMT -5
Did you do any work to that 70 before you bolted in on? If not done already if you widen the exhaust port you'll wake it up, 65% cord width would be good. You'll get some more speed out of it soon.
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Post by oldgeek on Oct 2, 2016 16:38:36 GMT -5
Did you do any work to that 70 before you bolted in on? If not done already if you widen the exhaust port you'll wake it up, 65% cord width would be good. You'll get some more speed out of it soon. Nothing but the squish IIRC. Do you have any links about doing that? I am good with tools, but not so much with math and such. |
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Post by PIG on Oct 2, 2016 16:40:35 GMT -5
Lol. I'm the same way
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Post by tsimi on Oct 2, 2016 17:08:33 GMT -5
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Post by ryan_ott on Oct 2, 2016 17:32:07 GMT -5
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Post by 90GTVert on Oct 3, 2016 6:49:20 GMT -5
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Post by oldgeek on Oct 3, 2016 20:50:16 GMT -5
Thanks, that is exactly what I need. Not sure I have seen that before but I got it bookmarked now. |
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Post by oldgeek on Feb 21, 2017 22:23:03 GMT -5
The rings for my streetrace motor that belongs in this scoot came today. I have a used piston from another kit to go with the new rings, and a HPI mini rotor iggy I picked up for cheap from treatland a few sales ago. I am going to use the streetrace cylinder I cracked and then repaired a while back, after I open the exhaust port up to 65% as recommended by others here. The crank has a bit of play in the big end bearing, no surprise there considering how it has been abused for the last couple seasons. Also going to install put the Yasuni C16 I picked up from a member, and hope everything lasts just one more season.  durations are 190/130 squish is .85mm - 70mm depending where you read it. I might raise the roof and bump the durations up just a hair. Gonna need some help setting up the mini rotor iggy. The flywheel is not keyed. I have never set one up. Do I need a micrometer piston stop thing, and a timing light? |
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Post by ryan_ott on Feb 21, 2017 22:39:55 GMT -5
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Post by Lucass2T on Feb 22, 2017 1:35:50 GMT -5
The rings for my streetrace motor that belongs in this scoot came today. I have a used piston from another kit to go with the new rings, and a HPI mini rotor iggy I picked up for cheap from treatland a few sales ago. I am going to use the streetrace cylinder I cracked and then repaired a while back, after I open the exhaust port up to 65% as recommended by others here. The crank has a bit of play in the big end bearing, no surprise there considering how it has been abused for the last couple seasons. Also going to install put the Yasuni C16 I picked up from a member, and hope everything lasts just one more season. durations are 190/130 squish is .85mm - 70mm depending where you read it. I might raise the roof and bump the durations up just a hair. Gonna need some help setting up the mini rotor iggy. The flywheel is not keyed. I have never set one up. Do I need a micrometer piston stop thing, and a timing light? Those durations are excellent! You could go a little smaller on the squish though! But keep an eye on compression, that could become fairly high! About the HPI ignition, here's an english manual www.hpi.be/downloads/068_1C_068_eng.pdfThis is for setting up for a base setting, so the engine will at least run. After that a timinglight would be handy. |
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Post by oldgeek on Feb 22, 2017 7:05:50 GMT -5
Lucass2T Thanks for the links! I should be able to set the squish wherever I want using the head 190mech step cut for me.  What should compression be kept under? I usually run 92 (R+M)/2) pump gas.
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Post by Lucass2T on Feb 22, 2017 8:12:50 GMT -5
I ran my metrakit sp3 (stage 6 racing) on 95RON with a 0.7mm squish. It got quite hot since the pistontop concaved (initially a flat top piston) but it never soft seized or seized up or anything.
I dunno the upper limit for compression. When you run it on a 0.7mm squish and it starts pinging you should mill out the combustion chamber. You can leave the squishband as is.
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durations are 190/130 squish is .85mm - 70mm depending where you read it. I might raise the roof and bump the durations up just a hair.