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Post by dexameth on Sept 6, 2018 11:25:02 GMT -5
ratdog good question. The SSP-G stroker crank does not need a longer timing chain. I was able to use NO spacers or extra gaskets using a piston with a shorter compression height. Still got me 205psi compression. If you look at a lot of the GY6 based strokers, some come as kits with the crank, timing chain, longer cylinder studs AND a spacer.
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Sept 6, 2018 11:39:48 GMT -5
Ok, a different piston would be my first choice, where did you get the different piston, or was it part of one of the kits you discribe? I hate the pistons that come in most of the big bore kits as they have a rough cast top. That has to act as a heat sink. On a couple of builds, we have turned the tops on these pistons and decked the cylinders to clean them up ( and lower the deck height to adjust for the slightly shooter piston
I have not seen a kit with a different piston yet, so far I only have seen the cranks as a stand alone item
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Post by dexameth on Sept 6, 2018 14:38:45 GMT -5
I got everything from where I work, Partsforscooters.com Our in house brand Hoca has switched names to SSP-G as Matt spoke of before and I wanted to keep everything house brand. Our SSP-G 52mm kit comes with one of those standard pistons but a VERY high quality cast cylinder. I went ahead and got our SSP-G 52mm piston because it's machined down more for less weight, and is slightly domed to match with the Hoca 52mm head. I used all this as well as the SSP-G stroker and it went together like a glove. Here's the products: Cylinder KitPiston Kit52mm HeadI didn't even try to build it with the stockish piston, but I did fear that it would make contact with the valves. I sold the same setup to someone in Pittsburg WITHOUT the nicer piston and he had no issues with the build. I'd like to know what his compression is...
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Sept 6, 2018 16:27:10 GMT -5
Fantastic. So your taking about .050 off the top of the piston then? Have you ever cut one of these in two to see how thick that piston top is? I only ash, because I take about .010” off the cylinder to clean them up. Really, that would be no issue because we already shim them to bring the compression back up. I like that they are 52 mm because tow of the cylinders I have came in BBK already bored for 50 mm, but someone over in China dosent do a very good bore job. Both cylinders have a taper. By going to the 52 mm piston, I can bore the cylinder right ( to fit the piston) and do the real fine hone job I prefere. Thanks!
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Post by scootnewb on Sept 12, 2018 11:50:08 GMT -5
I got everything from where I work, Partsforscooters.com Hook me up fam so I can review the parts on my You Tube channel I haven't created yet.
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Post by Kick start on Jun 28, 2020 13:22:00 GMT -5
I'm not even going to lie about this build. Stroker 50mm piston big valve head, a9 cam, exhaust, ncy variator 8g sliders, clutch springs 3 red 1 yellow. It won't even do 45mph, the 64mm big valve head does not do much.
I'm rebuilding a stock crank setup and proving its better with the 69mm valves.
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Post by scooter7878 on Aug 20, 2021 0:39:31 GMT -5
I'm not even going to lie about this build. Stroker 50mm piston big valve head, a9 cam, exhaust, ncy variator 8g sliders, clutch springs 3 red 1 yellow. It won't even do 45mph, the 64mm big valve head does not do much. I'm rebuilding a stock crank setup and proving its better with the 69mm valves. I got a ssd's similar set up I'm hitting 52 to 54 consistently as and 0 to 40 in 9 seconds. ssp-g stroker, airsal 50mm domed piston ,big valve head, a jml cam I'm not sure what number but the lobes were visible higher and wider ,oko 21mm flat slide carb, naraku high speed variator with 7g dr pulley sliders,bando kevlar belt,cheap glixal racing clutch yellow contra and red clutch, naraku intake spacer wss which adapts the bigger intake manifold port to the smaller port in head,and tsller gears in back.
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Post by scooter7878 on Aug 20, 2021 0:44:16 GMT -5
I'm not even going to lie about this build. Stroker 50mm piston big valve head, a9 cam, exhaust, ncy variator 8g sliders, clutch springs 3 red 1 yellow. It won't even do 45mph, the 64mm big valve head does not do much. I'm rebuilding a stock crank setup and proving its better with the 69mm valves. I got a ssd's similar set up I'm hitting 52 to 54 consistently as and 0 to 40 in 9 seconds. ssp-g stroker, airsal 50mm domed piston ,big valve head, a jml cam I'm not sure what number but the lobes were visible higher and wider ,oko 21mm flat slide carb, naraku high speed variator with 7g dr pulley sliders,bando kevlar belt,cheap glixal racing clutch yellow contra and red clutch, naraku intake spacer wss which adapts the bigger intake manifold port to the smaller port in head,and tsller gears in back. to be honest that naraku spacer made a huge difference on mine it tapers the bigger manifold to the smaller head. When I had a regular spacer in there theres like a lip the air hits it got a decent power gain and higher rpm max with just changing that spacer. I had to still do a little port work to get a smooth transition into the head but it made a good difference also the flat slide carb was big too hella mid range power with that carb
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Post by jackrides on Aug 21, 2021 12:42:41 GMT -5
Ratdog, your comments on the piston got my attention. I, polished them to reduce surface area and prevent carbon buildup, and been told that a carbon layer acts as a heat insulator increasing pressure. Thoughts?
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Post by scooter7878 on Sept 10, 2021 13:39:55 GMT -5
Ratdog, your comments on the piston got my attention. I, polished them to reduce surface area and prevent carbon buildup, and been told that a carbon layer acts as a heat insulator increasing pressure. Thoughts? . Not exactly sure in a scooter but I'm a auto tech and carbon build up in cars causes a lot of issues especially in German makes it causes lean conditions especially in start up and first few mins of running as the dry carbon acts like a sponge and soaks up fuel until the carbon soaks up fuel till it's saturated. It can also break up and jam in the ring gaps or cause intermittent valve seal problems. On my last 50mm bvh build I started hearing a noise after about 3000 miles I actually thought it was a crank but when I took head off there was so much carbon on top piston the valves were actually tapping the carbon in the piston top. I can say after I cleaned the carbon I got a lot of performance increase
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Post by steve1297 on Jan 11, 2022 17:51:35 GMT -5
Just installed the Naraku 52.4mm BBK and SSP-G stroker crank last night. Got it all from partsforscooters.com. Super quality, and they shipped it fast. 1st non Ebay kit I've ever bought.
I got over 5K miles on my last 52mm Ebay kit and stock crank. Was still running great.
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Post by steve1297 on Feb 8, 2022 6:34:09 GMT -5
I will add that the SSP-G stroker crank and Naraku 52.4mm BBK all button up with no valve clearance issues. dexameth I am using a 26mm OKO flat slide carb with a 110 main and 39 pilot. It's in tune. I'm using a Naraku variator, Naraku aluminum fixed half, 7g rollers, a stubby aftermarket exhaust. This thing has some crazy power. It's really quick.
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