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Post by ApeShit70 on Jan 18, 2018 7:45:36 GMT -5
So I have been trying to find what would work best for my Aprilia. Trying really to decide on a whole engine package. But there is so much out there that I really don't even know where to start??? I'm Looking to spend roughly 500 on crank and top end. A little extra for intake and Reed valve. So if anybody can help (minarelli) or has put together a good engine package let me know. I was going for top performance 86cc kit with crank but?  ? Thanks |
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Post by 90GTVert on Jan 18, 2018 8:29:30 GMT -5
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Post by Corrosion on Jan 18, 2018 8:39:07 GMT -5
FYI: You need to open the cases to accept the larger crankshaft & cylinder kit. It can be done with hand tools, but takes a good bit of tools and some metal working skill. I did mine with rotary grinder, Carbide burrs, Flap wheels, a set of test-fit Bearings are as helpful as, there will be many test fittings before assembly. The factory WP, I doubt it will spin 12k for long.
Top Performance, Minarelli's OEM, favored performance line, TPR was marketing a 86cc lc top-end & stroker Crankshaft.
end,bearings,seals,gaskets,ect. There is also a matching pipe. The kit and pipe were excellent build quality. The Crank, quality was not as nice as with the Cylinder kit or Pipe. Okay, but not great. Check run-out before using it.
The TPR cylinder kit and pipe's performance are Great. It needs a minimum of a 28mm carb, and good intake and high flow reed setup. I love it in my 2008 Zuma. But I have other bike to use daily.
The Crankshaft in the TPR LC, conversion kit, I would pass on it. It makes for a great value, but not a great choice. If you are going to cut your cases, build the best bottom end you can. You do not want to do this twice. You realize you will need an Ignition, waterpump, pipe, Carburetor, intake, reeds. Just to name a few more high dollar items.
The TPR lc stroker kit, is the beginning of your projected parts needs, Just so you realize this before tearing in.
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Post by Lucass2T on Jan 18, 2018 9:39:19 GMT -5
Athena 80cc kit. Excellent cylinder with great liner material, quality piston, nice port layout and good port timings (130/190). They come with a longer stroke crank which makes the engine more square compared to a normal bbk or the 86cc tpr. Square engines are better than over/under square engines.
Put on a 21 dellorto, yasuni c16 and some other goodies and you're in the 15-17hp range.
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Post by moofus02 on Jan 18, 2018 9:52:43 GMT -5
Athena makes a lc 80cc kit. 47.6 bore 43 stroke. It fits in stock cases (no cutting but I would trench it for flow) they recommend a yassani C16 pipe or equivalent. About 18hp they claim if I remember correctly. That kit with v force reeds and a phgb21 should make a fun street bike and be tame enough to be a daily driver. I would also recommend a complete over range kit old style or new as they are hard to beat. As has been started anything bigger will require cutting the cases. The high end stuff makes lots of power but are high strung. You really need to decide how you honestly intend to use the bike and what you can live with before buying parts. If you can live with the traits of the high end 86 plus kits you will love the power but they might be better suited for a toy instead of a daily driver.
Also your cases are probably like the Yamaha they get a little thin at the part seam. Some one had a post on here about how to build up the cases there with jb weld or the equivalent and get a smooth strait seam that will seal but I don't know where it is at. Basically they bolted a plate between the case halves with a relax agent on the plate, built up the cases and once everything hardened up took them apart with a new wider edge. I would consider doing that, would give you a wider seal and less likely to have a case leak at the seam
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Post by moofus02 on Jan 18, 2018 9:54:46 GMT -5
Athena 80cc kit. Excellent cylinder with great liner material, quality piston, nice port layout and good port timings (130/190). They come with a longer stroke crank which makes the engine more square compared to a normal bbk or the 86cc tpr. Square engines are better than over/under square engines. Put on a 21 dellorto, yasuni c16 and some other goodies and you're in the 15-17hp range. I must type slow but Lucas is right the closer to square you are with bore and stroke the better |
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Post by fugaziiv on Jan 18, 2018 9:57:59 GMT -5
Are you planning on removing the Ditech?
Matt
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Post by benji on Jan 18, 2018 12:19:25 GMT -5
your cases are probably like the Yamaha they get a little thin at the part seam. Some one had a post on here about how to build up the cases there with jb weld or the equivalent and get a smooth strait seam that will seal but I don't know where it is at. Basically they bolted a plate between the case halves with a relax agent on the plate, built up the cases and once everything hardened up took them apart with a new wider edge. I would consider doing that, would give you a wider seal and less likely to have a case leak at the seam Here it is. I posted these and some others on 2strokeassassins.com, found em on hondaspree.net.    |
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Post by Lucass2T on Jan 18, 2018 13:34:48 GMT -5
Are you planning on removing the Ditech? Matt Hold on, this guy has a Di-Tech? Then the whole minarelli story is out the window. Does he have the Piaggio purejet engine or the real (morini) Di-tech? The Di-Tech stuff is a whole different thing than what everyone here is used to. You have to tune it with a computer, no jets no carburetors nothing. I don't really know if you can build fast di-tech. Dunno if the Di-Tech hardware/software and sensor set supports any performance upgrades? Really never seen or heard about fast di-techs and everybody remembers the Bimota 500's...all got converted from efi back to oldskool carbs. Maybe look into the 2t snowmobile engines, they're all directly injected 2t's. |
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Post by fugaziiv on Jan 18, 2018 13:46:11 GMT -5
Are you planning on removing the Ditech? Matt Hold on, this guy has a Di-Tech? Then the whole minarelli story is out the window. Does he have the Piaggio purejet engine or the real (morini) Di-tech? The Di-Tech stuff is a whole different thing than what everyone here is used to. You have to tune it with a computer, no jets no carburetors nothing. I don't really know if you can build fast di-tech. Dunno if the Di-Tech hardware/software and sensor set supports any performance upgrades? Really never seen or heard about fast di-techs and everybody remembers the Bimota 500's...all got converted from efi back to oldskool carbs. Maybe look into the 2t snowmobile engines, they're all directly injected 2t's. He notes in a different thread that it's Di-tech, so I think so, yes. Di-tech can absolutely be tuned. I had a Di-Tech SR once, slapped an iron Malossi 70 kit with their CDI and called it a day. Easy peasy. It was a pretty fast bike. Matt |
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Post by ApeShit70 on Jan 21, 2018 10:15:14 GMT -5
I actually have 2 now. I have a 04 lc minarelli sr50 and I just picked up a ditech purejet , both unbelievable prices noth with titles noth dont run and both are missing some fairings. Im going to use the 08 ditech as a daily and the 04 mina as a powerhouse. Hopefully. Still only want to spend 500 tops on crank and top end for the mina.
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? Thanks
