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Post by niz76 on Oct 2, 2016 1:05:55 GMT -5
ikr? Can't seem to any good accurate info anywhere bc that just doesn't make sense! I know that you can use an 85mm rod on the Mina but then it needs the spacer. I wonder what it bumps it up to? An 80?  Crank shopping is so confusing! I'll get back at it tomorrow with a clearer head haha. I think the answer to your question is 82cc? IDK, the charts don't include rod length... ht tp://49ccscoot.proboards.com/thread/2627/minarelli-jog-engine-displacement-chart |
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Post by 190mech on Oct 2, 2016 3:55:49 GMT -5
Of course, the Big Bore cylinder is sold in two models: one for a race 39 and a second for the race 44 (the diagrams of time are changed). Suffice to say that this cylinder is able to compete with larger, one thinks of course the famous brand such as Cristofolini and 2Fast . A marvel signed Malossi sold around 350 euros, excellent quality / price." Read more: 49ccscoot.proboards.com/thread/9791/scooter-diary-roketa-60mph-driver?page=47#ixzz4LuqgiWHhThe above states the 39 and 44 have different port timings,so the 77cc jug will have waaay too much durations with a 44 crank.. Connecting rod length has nothing to do with engine capacity,only the bore and stroke... |
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Post by niz76 on Oct 2, 2016 10:29:47 GMT -5
Of course, the Big Bore cylinder is sold in two models: one for a race 39 and a second for the race 44 (the diagrams of time are changed). Suffice to say that this cylinder is able to compete with larger, one thinks of course the famous brand such as Cristofolini and 2Fast . A marvel signed Malossi sold around 350 euros, excellent quality / price." Read more: 49ccscoot.proboards.com/thread/9791/scooter-diary-roketa-60mph-driver?page=47#ixzz4LuqgiWHhThe above states the 39 and 44 have different port timings,so the 77cc jug will have waaay too much durations with a 44 crank.. Connecting rod length has nothing to do with engine capacity,only the bore and stroke... Thanks John! As you can see I am a little confused by all these different numbers and how they work together in relation to the cylinder. I do have the 5mm spacer to use... What would be the best way to ensure getting the correct crank here? Should I make a port map? I also have a 12mm pin, 50mm piston here so I could mock it up on my existing engine/crank.... |
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Post by ryan_ott on Oct 2, 2016 12:12:55 GMT -5
Wouldn't measuring from deck to bottom of the exhaust port give you stroke? As long as you don't have a recessed head.
Err... I just checked, nope. Lots of variables here: stroke, rod length, piston height and squish. There is likely a formula somewhere to calc it.
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Post by 190mech on Oct 2, 2016 12:53:17 GMT -5
Wouldn't measuring from deck to bottom of the exhaust port give you stroke? As long as you don't have a recessed head. Err... I just checked, nope. Lots of variables here: stroke, rod length, piston height and squish. There is likely a formula somewhere to calc it. Yes!Measuring from the deck to the bottom of the transfer ports is a good way to determine approximate stroke..If you install a crank with a longer rod,but the same stroke,a base spacer is needed..All of your mentioned variables can be used to a builders advantage to make one off/out of the norm builds go smoothly.. |
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Post by 190mech on Oct 2, 2016 12:58:13 GMT -5
Thanks John! As you can see I am a little confused by all these different numbers and how they work together in relation to the cylinder. I do have the 5mm spacer to use... What would be the best way to ensure getting the correct crank here? Should I make a port map? I also have a 12mm pin, 50mm piston here so I could mock it up on my existing engine/crank.... Read more: 49ccscoot.proboards.com/thread/9791/scooter-diary-roketa-60mph-driver?page=47&scrollTo=258624#ixzz4Lx3xbeCXNiz, If you post the port heights from the deck to the top of the port and get a deck to bottom of transfer also,I can run them on porting calculator to give you an idea of what youve got.. |
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Post by ryan_ott on Oct 2, 2016 13:06:51 GMT -5
One of the reasons I mention piston height. Left MHR 50mm, right 54mm stroker almost 9mm difference.  |
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Post by niz76 on Oct 2, 2016 22:02:56 GMT -5
Ok, I'll post up measurements when I get a chance.
What's the difference between the MVT Premium and the MVT DD? You can put an electric pump on the DD? Anything else?
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Post by spaz12 on Oct 2, 2016 22:05:53 GMT -5
Ok, I'll post up measurements when I get a chance. What's the difference between the MVT Premium and the MVT DD? You can put an electric pump on the DD? Anything else? I believe that the DD produces more electricity and it also has a couple different timing curves. |
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Post by niz76 on Oct 15, 2016 21:02:23 GMT -5
So I installed the Leo Vince ZX exhaust today in place of the Technigas Next R 100cc.  I actually installed it a couple days ago but I needed a new exhaust gasket and didn't have any so I headed up to Advance Auto Parts for this gasket set:  They had sheets of exhaust gasket material but for a few bucks more these gaskets were thicker and seemed nicer. I can make about 6 exhaust gaskets out of these for $10. Not too shabby!  Wow what a tight fit this ZX is. And I thought the Technigas hugged close!  My first initial impressions?: It seems to have a little better "grunt" than the Technigas but the top speed is a little less. If I can get rid of the massive slipping in my CVT, it should be real easy to pull wheelies! Of course I need to tune things a little better, but when the wifey asked about this new exhaust the other day I said "I'm not super excited about this new exhaust, I mainly just bought it because it was such a good deal and I've always been curious about them. I'm basically going from a Kmart exhaust to a Walmart exhaust" haha. She laughed at that. To my surprise I had to upjet the carb. It just bogged at WOT and I went from an 88 to a 98 and she seems to be running real well now. Of course, I'll see if I can dial it in even better with more time. Luckily changing jets is real easy with my setup!  FAIL! After rejetting the carb and playing around the neighborhood for a bit I took it out for a little longer ride to check things out. I made a vid of the ride and right at the very end things went horribly wrong! When I was coming up the hill toward my house the RPM's suddenly rose and I started dropping speed. I came to a stop light and things just didn't feel right- when I'd give it throttle it acted like it didn't want to move much. When the light turned green I could barely go and you can see that I had to get over to the sidewalk. I ended up losing two bolts from the exhaust and most alarming- gear oil was pouring out from the CVT cover. Doh! You can see for yourself... Here's what I found when I got home and opened things up:  Grr Dangit! One of the "ears" somehow snapped off my gear cover!  Luckily I do have an extra one. This one is from the old parts Vento Zip from way in the beginning of this build thread. When I swap back and forth from the 11:1 Zip gears to the 8.8:1 Adly ATV gears I just swap the whole cover over. I'll need to swap the parts into the Adly gear cover and try again! |
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Post by 90GTVert on Oct 15, 2016 21:33:37 GMT -5
That sucks, but thanks for posting it with a vid. That's a new one to me. Sooner or later we'll see every fail possible on the forums.
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Post by niz76 on Oct 15, 2016 22:00:23 GMT -5
That sucks, but thanks for posting it with a vid. That's a new one to me. Sooner or later we'll see every fail possible on the forums. I'm wondering if I didn't crack it during installation and after riding a bit it just failed? IDK... |
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Post by tsimi on Oct 15, 2016 22:42:54 GMT -5
Firs thing I noticed, in the video at 3:24 and 3:29 isn't there suppose to be a *piip* sound?  Anyways, that sucks man. Lucky the pipe didn't loose all bolts you don't want the pipe to hang only with the 2 bolts at the flange. How can that happen? I mean how do you break a gear cover? Did it drop once? The gears look fine though so lucky that you stopped the scoot and checked it out before more damage could happen. |
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Post by niz76 on Oct 15, 2016 22:51:48 GMT -5
Firs thing I noticed, in the video at 3:24 and 3:29 isn't there suppose to be a *piip* sound? Anyways, that sucks man. Lucky the pipe didn't loose all bolts you don't want the pipe to hang only with the 2 bolts at the flange. How can that happen? I mean how do you break a gear cover? Did it drop once? The gears look fine though so lucky that you stopped the scoot and checked it out before more damage could happen. Yes I'll have to add the *beeps* later  Only thing I can think is that maybe I tightened one bolt too tight and cracked it during install maybe. Still not sure how it broke but luckily yes the gears are ok! My first thought when RPM's went up but it would barely move was Brent's shredded gears. It seems that it was just the belt and rear pulley getting covered in gear oil! |
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Post by greggkinney on Oct 15, 2016 23:31:16 GMT -5
Just wanted to say nice scoot. I like readin g your builds some are pretty sweet. On page 5 you and 2strokd were talking about the polini paint job and needing a part to warrant the use of a sticker. Well I've seen some kik ass blue grips with polini wrote on them in white lol. hey its a brand part so....U can use that sticker. Anyways awsum build n keep up the good work looking foward to seeing more from you.
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