Kimjon Posted January 19, 2018 Author Share Posted January 19, 2018 Here it is with the crank and piston installed. The open style of cylinder with a removable head allows me to port time the motor. I'll stick a degree wheel on the crank, turn it over and measure the degrees at which the ports open and close. Once I have this data, I'll know where improvements can be made. 3 Quote Link to comment Share on other sites More sharing options...
Muncie Posted January 19, 2018 Share Posted January 19, 2018 I think we're going to see a goped have 3 digit top speed. Dromegedden quarterly would be great. 1 1 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 20, 2018 Author Share Posted January 20, 2018 Here's a view of the piston placed exactly where it ends up at BDC. note the skirt is to long and the sides of the barrel don't match. And here it is after matching Now it's a matter of matching to (barrel) to the cases. Â 1 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 20, 2018 Author Share Posted January 20, 2018 Roughing it out Still a bit of work to do, but already a huge improvement. When I'm happy with the "flow" it will get polished up. The intake should be rough, the rest should be smooth 2 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 20, 2018 Author Share Posted January 20, 2018 Cases polished Transfer ports case matched   3 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 20, 2018 Author Share Posted January 20, 2018 Here's a before and after photo to see the difference And after And hopefully that equally more flow, and will be one of many things that add up to more power. Next up for the motor is to calculate its port areas, timing, squish band and compression...then tweak those with yet more porting. 6 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 21, 2018 Author Share Posted January 21, 2018 Piston received a little love. It was black as black can be with carbon build up. Here it is after 10 minutes sanding: Still looked shit...so I broke out the random orbital, couple minutes on that, then on the buffer wheel...finally got the dome polished where it needs to be. That was way more work than anticipated. 5 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 25, 2018 Author Share Posted January 25, 2018 Okay...more porting, followed by more porting... Â I'll do a bit more on the flow side and then polish it up again. Â 1 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 25, 2018 Author Share Posted January 25, 2018 On to the reed valves. In my opinion, they face the wrong way in these motors? The air/fuel is dragged in, up and around the massive reed support. I've flipped them around so that the air/fuel mix is pulled cleanly through them unobstructed. Fingers crossed this is the right idea??? However, problem is they don't fit! So I'll make them fit!!! Okay...truth be told it was never going to hold how I clamped it above and it moved on me, so take 2 below: Mmmmm pretty... Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 25, 2018 Author Share Posted January 25, 2018 Now they fit: But I don't like the angle, its to restrictive and the reeds hardly open. So hell bent on thinking I can do better than the factory i further milled the base to change the angle. Â Â 2 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 25, 2018 Author Share Posted January 25, 2018 I further milled a step on top to add clearance, and used the dremel to smooth it out And then installed it, perfect! Follows the crank, allows a nice wide opening, flow is now going the right direction...think it's getting there now. 2 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 25, 2018 Author Share Posted January 25, 2018 Exhaust then got VHT ceramic paint And that's about it for now. 2 Quote Link to comment Share on other sites More sharing options...
Popular Post UTERUS Posted January 25, 2018 Popular Post Share Posted January 25, 2018 10 2 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 27, 2018 Author Share Posted January 27, 2018 I ordered a diaphragm style carburetor kit from eBay, it arrived in record time...But it would have been awesome if they'd sent me the right one. The manifold in the kit was for a completely different motor! It only has two mounting holes, but my motor has four. Countless emails, achieved nothing in the end...I just wanted the shitty Chinese manifold for fuck sakes...But in the end they offered a part refund instead, which leaves me no further ahead. So, solution: Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 27, 2018 Author Share Posted January 27, 2018 Original manifold milled down flat, this will bolt to the motor. Port matching to the other manifold shape. A pulse port drilled in the side to run the fuel pump/diaphragm. Test fit...Fucking ugly as sin, but should be functional. I'll grind off any excess material later to try make it look a wee bit better than it currently does. 2 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 28, 2018 Author Share Posted January 28, 2018 Finished the manifold. I'm pretty sure its going to work. Here it is loosely in place 1 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 28, 2018 Author Share Posted January 28, 2018 Now jumping on to brakes. I've added a disc brake to this goped. It was missing its brakes, so I hacked off whatever brackets were there and started again: A few holes and a couple minutes with a grinder made this sexy bracket. Gotta love a good bracket! Tacked in place. Â Â Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 28, 2018 Author Share Posted January 28, 2018 Welded both sides for extra over the top strength. I'm not too keen on coming off like @Muncie at top speed and braking my neck. And done! It's all getting a paint job later, so that will tidy up the ugly. Quote Link to comment Share on other sites More sharing options...
Muncie Posted January 28, 2018 Share Posted January 28, 2018 Pretty sure that thing will exceed twice the speed i fell off at. Wear a full face helmet too your heads a lot further up than mine is. 1 Quote Link to comment Share on other sites More sharing options...
Kimjon Posted January 28, 2018 Author Share Posted January 28, 2018 As all of us know, NZ is a small country. In other countries say the USA even if only 0.00001% of the population was into a niche activity (like gopeds) that'd still equate to over 3,230. In NZ 0.00001% of the population would only be 45 people. You can see why no one would make a living here doing anything that's not mainstream. So that's my long way of saying I was unbelievably lucky, to find/buy this on trademe last night! Seriously...I couldn't believe my luck, a box of go-fast bits for my motor. Fuck yeah! Stoked!!! 2 Quote Link to comment Share on other sites More sharing options...
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