|
Post by 90GTVert on Sept 26, 2009 21:56:44 GMT -5
I just hand-lapped the valves.
Yeah Reg, I'm back to hating this scoot... but then again... I kinda wanna beat it, rather than it beating me. I have seen 42MPH on pretty flat ground so it gave me some hope for the stupid thing.
|
|
|
Post by stepthrutuner on Sept 26, 2009 22:51:54 GMT -5
I just hand-lapped the valves. Yeah Reg, I'm back to hating this scoot... but then again... I kinda wanna beat it, rather than it beating me. I have seen 42MPH on pretty flat ground so it gave me some hope for the stupid thing. That's a good attitude. There's no reason that character building should be excluded from the builds section.... not inferring that your character is lacking, of course. Life is a continuing lesson. I suppose this is just one of the more difficult chapters for you.
|
|
|
Post by 90GTVert on Sept 26, 2009 23:01:12 GMT -5
I wouldn't say dealing with a junk scoot is one of the more difficult chapters in life, but it can certainly be frustrating. The thing is, if you think my luck with this scooter is an ordeal, you should have seen the whole process with my car. I've been told to just sell it so many times. Even the tuner, a very reputable one in the Mustang world, told me he wouldn't have gone through what I have with it.
|
|
|
Post by stepthrutuner on Sept 26, 2009 23:47:54 GMT -5
Perhaps I should have used the word "trying" instead of "difficult". Scooters are very simple and cheap and easy to work on compared to cars and therein lies much of the pleasure and reward of owning, modifying and improving them.
|
|
|
Post by 90GTVert on Sept 27, 2009 1:19:19 GMT -5
Exactly. I can't seem to make anyone else around me understand that though.
|
|
|
Post by 2strokd on Sept 28, 2009 7:34:02 GMT -5
Dang Brent! WTF, I have heard of love hate relationships but i think this scooter just hates. In a previous life it was a 2 stroke and now it just cant deal with all the moving parts and such little power . What are we all gonna do if they outlaw 2t,s, i might just get my license back . Hey im glad it hit over 40 ;D, thats progress step, you said it!
|
|
|
Post by 2strokd on Sept 28, 2009 7:35:38 GMT -5
At least you and your pop got to go for a bit of a ride before it quit
|
|
|
Post by 90GTVert on Sept 28, 2009 8:25:33 GMT -5
What are we all gonna do if they outlaw 2t,s That's what I'm trying to figure out now. I know it's coming, so as much as I hate this scoot sometimes I look at it as a learning experience for dealing with all of the 4 strokes in the future.
|
|
|
Post by 2strokd on Sept 28, 2009 8:42:47 GMT -5
What are we all gonna do if they outlaw 2t,s That's what I'm trying to figure out now. I know it's coming, so as much as I hate this scoot sometimes I look at it as a learning experience for dealing with all of the 4 strokes in the future. I hear ya. Thats what i kinda figured you were doing, i would too if i had one. These 4strokes have a ways to come. No GY649cc fan thats for sure . They just seem like a piss poor design to me.
|
|
|
Post by 90GTVert on Sept 28, 2009 8:50:59 GMT -5
They are odd, dunno that they're all bad. It's weird to me that there seems to be so much of a difference in what speed they may go stock. Kinda sucks not knowing if you'll go 30, 35, or 40MPH out of the box. The minarelli engines may go faster or slower, but it seems to be just gearing. The Triton goes fast but doesn't take off that great because of it's gearing. The Zuma goes slower but takes off quick. The 4 stroke might take off slwo and have a low top speed.
|
|
|
Post by 2strokd on Sept 28, 2009 8:59:18 GMT -5
I dont get that either? What gives! Its not gearing, nor CDI, or weight, why do the same scoots run totally different? I mean cars do it too but not to this extent. I have worked on 4 or 5 GY6 49,s and they all ran different but were the same? I know why Skeedr doesnt like 60mph much, because its outta gear and motor. What the excuse a bb scoot wont wheelie or go 45mph? I guess i need more homework....
|
|
|
Post by 90GTVert on Sept 28, 2009 13:57:09 GMT -5
I did a little measuring of the stock 50cc cylinder and piston vs the 70cc cylinder and piston. The 70cc cylinder is about .015" taller than the stock cylinder. The distance from the wrist pin to the top of the piston (measuring to the outer edge, not center dome/dish) is .016" shorter on the 70cc than the 50cc. That means the 70cc piston is .031" farther from deck than the 50cc piston. I'm very tempted to get .030" knocked off of the deck... but maybe I should probably wait. I'm thinking it's pretty safe considering I had roughly .070" of piston to valve clearance to spare with the stock head and the 70cc cylinder. I ordered a new head though. It's a 47mm bore with 21mm intake and 19mm exhaust valves. Stock valves are 18.5mm intake and 16mm exhasut. I should probably wait and see if piston to valve clearance changes. Just hate to put it off for much longer waiting on machine work when I've got .040" room to spare with my last check even after the .030" I'd like to mill. That would be .015" shorter than the stock cylinder. I would think the cam chain tensioner should handle that without issue.
|
|
|
Post by 2strokd on Sept 28, 2009 16:08:09 GMT -5
Hope this head works for you and she stays together for awhile, or at least until you want to take it back apart .
|
|
|
Post by 90GTVert on Sept 28, 2009 16:21:17 GMT -5
Yeah, it would be nice. I can't b*tch too much, after all it was me that knicked the valve seat not Sunl. Now why I can't get one to stop leaking oil, that one will have to go to Sunl. It did start dripping just a little at the base before it got pulled apart again. So it's had gaskets, coated gaskets, just RTV, and more torque and nothing will seal it. That's with good prep too, I'm not just slapping gaskets on without cleaning. RTV still worked the best, but nothing so far has been 100%.
|
|
|
Post by 90GTVert on Sept 29, 2009 16:36:22 GMT -5
The 47mm big valve head I ordered turned out to be a 50mm head. First the 47mm was out of stock. Then it was a 47mm head that can be used on 47mm or 50mm BBKs. Then it was a kit of unknown size that was intended to be used for either because of the way it tapered. Then it was a 50mm kit that could be used on a 47 or 50mm cylinder kit. After being confused by a salesperson that doesn't seem to have a lot of technical knowledge, I just said send it. I woulda just cancelled it, but I've got a 150cc carb, intake, and spacer on the way and I really don't think they'd work too well with stock valves and such. The 150cc carb has a 24mm outlet. The 1560cc intake is 22mm. The cylinder head's inlet is 21mm. I'm thinking I'll just port match this stuff, enlarge the inlet of the intake and enlarge the opening of the intake port on the head. I'll probably make the exhaust port larger to match up to the exhaust, it's 18.6mm and the exhaust inlet is over 20mm. I'm thinkng the passages inside the head will be plenty large enough for my little engine without anything other than the afore mentioned port matching and some cleanup. I'll be avoiding or protecting the valve seats at all costs. That's what I get for sying 4 stroke porting is harder to mess up. Oh, and I am waiting on milling anything until I get the head so I can mock it up and check clearances with these bigger valves. I know it's gotta have something knocked off though, especially if the head is 50mm. I might be better off milling the head instead of the cylinder at that rate. 50mm x .030" (or whatever it ends up) will knock down volume more than 47mm x .030" and I can't say I'm fond of having a mushroom shaped combustion chamber if the new head really is 1.5mm larger on all sides.
|
|