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Post by 90GTVert on Nov 30, 2014 10:13:31 GMT -5
That Scrappydog surface does not look much better. True. It has a sort of constant inconsistency (if that makes any sense). The Growsun head has a big bump though. I can't imagine it ever sealing as-is. Not sure the Scrappy head would either without a bunch of sealant maybe. Not sure what the deal is now. A member here, hit88, used to do the heads and they seemed like good quality. I bought this a year or so ago and never unboxed it till now so I dunno who's doing the heads or if that was his, but it would be hard to miss the imperfections there when hand porting the head so it's a shame to see it get by and be sent out. If I am identifying things right it seems to be just as I expected. The stock 50cc stuff has a mismatch with the 50cc intakes. The big bore/valve heads look like they have been set up for the 150cc intake with the large ~23mm intake ports centered between the studs. I didn't measure them, but they look smaller than the GY6 150 stuff. Would be nice if there were a cheap centered intake that matched well. There probably are with offerings from Naraku and Hoca and others, I just don't have them ATM to check out. Might have to add one to the list if I get a chance. It looks like the Hoka and Naraku are the better heads. I haven't looked them over close, but at a glance the Hoca and Naraku heads look much better. The exhaust port on the Growsun has flakes of aluminum left on it. Really not something that should be taken out of the box and bolted on. You do pay a pretty penny for them, but then the Scrappy head with the messed up intake port was not cheap either. Hopefully most people won't be like me and buy this stuff and let it sit a year before looking at it so a return would be an option.
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tvnacman
Scoot Enthusiast
Posts: 408
Location: NYC
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Post by tvnacman on Nov 30, 2014 10:21:17 GMT -5
Franken , I see the spacer did not work to well for you . What can I do to make it right ?
John
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Post by FrankenMech on Nov 30, 2014 12:58:32 GMT -5
No problem John, I will use it with a BBK or something later on. It goes into my growing pile of spare parts. I recently had to transfer them to a bigger box. I need to figure out some marking system to tag them with before my memory fails completely. At ~23mm it was aligned with the head port but just a little too big for use with the 50cc O-ring seal intake manifolds I had. It covered most of the O-ring but a small error in alignment could have caused leaks. That would be fine in aerospace parts but I don't trust these China made parts or my abilities with a file to be that consistent. The part I am using is a 20mm part that will not require me to remove as much head material also. One of my intakes was OEM the other was one of Scrappy's two vacuum port models. I ended up putting an extra vacuum port in my carb body instead of using the second port. It may get used for a vacuum gauge or something.
The OEM intake had a flow passage through the manifold that showed some hand work had been done. The O-ring surface was 'as-cast' showing a lot of irregularities. I did not see any evidence of leaks though.
The Scrappy 2-V manifold had basically two intersecting passages with a sharp edge and ridges at the junction. The O-ring surface was well machined.
I used the Scrappy manifold for my porting work to convert the intake side for a Carb outlet OD 32mm and Carb outlet ID 25mm or 32x25mm. There is not a lot of metal left in some places. I hope it lasts for a while.
The mysteries of head and port alignment with these machines are getting my attention. It will be interesting if we can get some port measurements and distance offset from the studs on some of these heads. That can only improve the abilities of vendors and buyers to select the right parts for an application. John, you give a lot of dimensions and specifications for your parts, but many vendors just state 'fits XXcc GY6' which is iffy at best.
The air filter fit correctly. It did not have a weld nut as shown in the end though. I had to drill a hole and use a sheet metal screw instead. That sealant used in the filter is difficult to drive a screw through. I had to relieve the screw hole from the back side. I fabricated my own cover to have ports I needed and protect the filter from water. I also lined the cover with some industrial acoustic foam I had to cut down on noise transmission.
I have not removed the exhaust pipe so I have not checked fitment on the exhaust port gaskets. IF I can get this new carb and intake system working that is one of the next projects. I have a stainless muffler for an '85 Honda Civic I want to use to try to get the noise level down. I like 'stealth' scoots. I don't want to be heard a block, or even 50 feet away.
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Post by Clank on Dec 2, 2014 10:23:37 GMT -5
Unfortunately I have lost 1/4 of the brain I had to strokes. The holes are glaring but there is nothing to be done. I am just left with the insanity. Depression has taken a toll on my genius nephew and son also. Just remember to thank my uncle for the GPS you use while measuring your scoot performance. I can't really say I'm a fan of GPS, but I am a fan your threads and posts. They're always informative and entertaining. Hope your doc is on his "A" game and wish you a quick and healthy recovery. :thumb:
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Post by FrankenMech on Dec 3, 2014 20:28:44 GMT -5
All of the porting is done and the carb assy is installed.
It fired right up but then flooded. There is a leak somewhere in the VITO jet circuit I think. At least fuel is running out the front of the carb with the filter removed. It seems to be running out from where the VITO jet is. I will have to cut the fuel to that circuit and try again tomorrow when the engine is not flooded.
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Post by 54cc on Dec 5, 2014 16:47:33 GMT -5
was that spacer upside down? mine if i flip it upsdie down, blocks part of the carb hole and intake hole. its supposed to sit the other way. did you figure it out?
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Post by FrankenMech on Dec 5, 2014 18:23:24 GMT -5
The spacer was in right. Upside down it would have been even worse and would not have sealed at all.
-To get everything lined up I had to use a 19mm spacer instead of a 16mm spacer. -The manifold bolt holes had to be slotted to move it about 2mm up/forward. -The head had to be ported to 20mm.
A 20mm spacer could have been used but the head would have needed to be ported to 21-22mm.
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tj
Scoot Member
Posts: 56
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Post by tj on Jan 19, 2015 0:41:27 GMT -5
I did a BBK on my taotao and noticed the isolator gasket was smaller and didnt put it back on when I put it back together. Runs fine. Not 100% sure you need it. I have been questioning it. but it doesnt seem to be hurting it not having it...
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