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Dec 8, 2021 6:15:32 GMT -5
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Post by dandanman232 on Dec 8, 2021 6:15:32 GMT -5
What is the best cylinder and exhaust plus carb to go with a +2.2 stroker crank? I already have a 21mm pwk . Thanks sorry I’m good with the 4 strokes but the 2 stroke performance is allusive to me
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messenger
Scoot Enthusiast
Posts: 188
Location: Coventry, u.k.
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Post by messenger on Dec 8, 2021 6:29:10 GMT -5
Thats a very subjective question, and depends on what you want to use the scoot for...
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Post by Lucass2T on Dec 8, 2021 8:34:17 GMT -5
What is the best cylinder and exhaust plus carb to go with a +2.2 stroker crank? I already have a 21mm pwk . Thanks sorry I’m good with the 4 strokes but the 2 stroke performance is allusive to me Are you planning to use Athena 43mm crank? If so, use the corresponding Athena cylinder or the Gilardoni stroker cylinder. Yasuni R is always a good choice.
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Dec 8, 2021 13:17:00 GMT -5
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Post by dandanman232 on Dec 8, 2021 13:17:00 GMT -5
It’s the hoka 41.4 stroker crank I think that is it. I just want a 60mph bike and want to know what would go with that and a 21mm pwk so exhaust and cylinder
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Post by dandanman232 on Dec 10, 2021 20:11:22 GMT -5
Come on guys I can’t waist anymore money I need a quick reliable bike
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Post by ThaiGyro on Dec 10, 2021 22:34:42 GMT -5
Sorry dandeman, but your question is quite vague. Thus, few can give you a proper answer.
A plus 2.2 ? Over what? I have a chart with near 40 different bore and stroke combo's...that is just 49 to 70cc and only my own work.
What engine? What scooter? What year? What was the OEM specs? Or, what is your current spec?
What is a stroker crank? (I am not young and believe that (EX): "3/4 race cams" are shit...for dumb PPL with too much $$) HINT: stroker is just a word! What does that mean?
So, just need for you to give as much detail as you can! Many good brains and experiences here, yet no crystal balls...just balls, and other fun gender parts.
I apologize if that is a bit harsh...but, your question is just way too vague.
(BTW...waste is the proper word for careless, no longer needed, or weakened. "Waist" is space between your ribs and hips.)
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Post by repherence2 on Dec 11, 2021 17:56:46 GMT -5
Come on guys I can’t waist anymore money I need a quick reliable bike
"quick reliable" is relative.
what do you want for yourself?
simple solution/recommendation from us would be sport 70cc bore kit with a pipe. the pipe would depend on what you looking for. if you want decent performance over stock while still being quiet, a half-wave exhaust like a YMS v8 or a Jiangwang will suit. if you want a little bit more performance and higher/harder rev hit, you get a chamber pipe which probably will be louder than a half-wave pipe.
here is the kicker, you got the +2mm crank. that changes the game. i am assuming you are talking jog/minarelli.
Easiest option: look for a bore kit that is made for longer stroke, like was mentioned in a previous response.
but how nuuuuuts do you want to get?
the way i look at it, there are options, but these options are limited by your skill/know-how.
let's take the Jog90 approach. assuming you are talking about a jog/minarelli +2mm crank, that would be in the Jog90 realm of things. you could open up the area on the case where the bore skirt goes so that you can install a "90cc" bore kit, a 50-54mm bore kit. Hoca (SSP-G) makes a 54mm bore kit. 50mm bore put you around 83cc and the 54mm put you around 94cc. you can probably even use Polaris Sportsman/Scrambler 90 bore kits at that stroke. i like the "90cc" low rev stuff (less than 10k rpm). got power on the low and high end. it does not scream, but it can pull. low rev = reliable. enough low end grunt and displacement to be "quick reliable".
let's take the DIO ministroker approach. going +2mm over stock is similar to the ministroker set up for DIOs. you could take a 70cc Polini Corsa or Contessa, bust out the degree wheel, stack up some base gaskets and get the timings set, and mate that to Yasuni C16. that would be relatively "quick reliable". it may involve some porting.
what do you want for yourself. "quick reliable" is relative.
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Post by 90GTVert on Dec 13, 2021 9:48:03 GMT -5
The 41.4mm stroke may make things a little more difficult. Most of the top kits are for stock 39.2mm stroke, so it's very likely that you're going to end up needing to do some adjusting to get good results since the piston is traveling 1.1mm lower and 1.1mm higher than intended for the majority of kits. Aside from making it difficult to get the port floor level with the piston crown at BDC, it will be more work to get proper squish and compression figures. I'm not sure if any of the companies making these mini-stroker cranks ever made cylinders to match or not.
Some "90cc" stuff had a 42mm stroke. I'd think those would actually be closer to working with a 41.4mm stroke, but they're probably all going to be very large bores of at least 50mm and up. The stuff intended for "90cc" engines usually has larger skirts and won't fit into 49cc cases without boring. You've gotta be careful if you do order something for the 90 engines, because they also have strokes of 45mm and beyond and cylinders for those will be a poor match. Whatever you do, DO NOT buy ultra cheap 90cc stuff (or 50-70cc stuff for that matter). It's junk and that's from experience. Regardless of what kind of kit, at least get something made in Taiwan, if not a major brand like Polini, Malossi, and so on.
None of this is to say that you can't make the +2.2mm crank work well for you, but be aware that you are in for more effort to get it setup unless someone else knows of a cylinder kit for that stroke length. This is where the "simple" 2Ts are suddenly more complicated than 4Ts. With the 4T, you mostly need to make sure there's clearance for everything, but here you've got those issues plus throwing off port locations and timing.
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Post by 90GTVert on Dec 13, 2021 12:32:10 GMT -5
I did a little googling and there were a couple of posts on this forum that linked to a cylinder that is supposed to work with a 41.4mm crank... but none of the links go where they should now. I looked at sellers that carry the 41.4mm cranks, but they just have standard 70cc cylinders if they have related parts on the page. I was thinking Autotech355 may have carried a kit at one point, but I didn't find anything and I may be mistaken and it was a 42mm stroke crank and cylinder combo.
If it were me, I'd probably just try to get a 70cc sport kit that uses head gaskets instead of o-rings. IMO it's easier to work with gasketed heads if you need to make changes. Adjust to the best compromise that you can find for port position and timing, squish clearance and compression. Use something like a C16 that is a strong performer. That should get you a 60MPH bike. If you want to cruise at 60MPH, you may need more power than that, but it should reach 60 anyway if setup right.
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Post by repherence2 on Dec 14, 2021 23:16:58 GMT -5
It’s the hoka 41.4 stroker crank I think that is it. I just want a 60mph bike and want to know what would go with that and a 21mm pwk so exhaust and cylinder
did you install the crank in the case already? ...if not, more easy to just get a stock stroke crank.
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Question
Dec 16, 2021 19:10:17 GMT -5
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Post by dandanman232 on Dec 16, 2021 19:10:17 GMT -5
I’m going to get the Athena 70 kit that comes with extra gaskets and get a larger intake, and new gears too the Athena kit is 47.66
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Dec 17, 2021 1:46:42 GMT -5
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Post by Lucass2T on Dec 17, 2021 1:46:42 GMT -5
I’m going to get the Athena 70 kit that comes with extra gaskets and get a larger intake, and new gears too the Athena kit is 47.66 Athena makes 2 versions of their 47.6mm kit. The standard stroke and the long stroke. If you are going with the regular Athena 70cc kit and not the long stroke version, stick with the standard stroke crank.
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Dec 17, 2021 6:21:59 GMT -5
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Post by dandanman232 on Dec 17, 2021 6:21:59 GMT -5
Ok what’s the best carb and pipe to go with it I’ll just put the regular crank back in it I recon
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Dec 17, 2021 8:28:11 GMT -5
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Post by Lucass2T on Dec 17, 2021 8:28:11 GMT -5
Ok what’s the best carb and pipe to go with it I’ll just put the regular crank back in it I recon Are you gonna race it, daily drive it or something in between?
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messenger
Scoot Enthusiast
Posts: 188
Location: Coventry, u.k.
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Post by messenger on Dec 17, 2021 11:16:19 GMT -5
Ok what’s the best carb and pipe to go with it I’ll just put the regular crank back in it I recon I run a stage 6 Racing mk1 cylinder, which is really just an Athena Racing 70cc cylinder that stage 6 rebranded for themselves. I use a Yasuni C16 pipe on mine with a Dellorto 21mm PHBG carb.
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