Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 14, 2009 20:17:03 GMT -5
lol ha we both know out of all the years on working on cars and small engines shit does happen that you cant predict..... shit happens......
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Post by 90GTVert on Jul 15, 2009 0:43:46 GMT -5
It's approaching 2AM and my alarm is set for 5:15AM to get up and head down to pick up you and the scoot. Stupid insomnia.
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Post by 90GTVert on Jul 16, 2009 19:25:00 GMT -5
Well, the project didn't go quite as planned... I picked up Bob and the Zen King and we headed back to my house ready to get to work.   We took a ride to see what the scoot would do in stock form. My Triton was faster than the 150 in stock form even with my weight. I could beat Bob by a couple of scooter lengths to 50MPH or so. Top speed was kinda close. We switched scooters so I could check out the Zen King. I gotta say, they 16" wheels are very nice. I feel more confident taking turns on the bumpy back roads around here with. With the big wheels, bumps just make the suspension work. On my scoot bumps will try to twist the front wheel and make the scoot feel unstable sometimes. There is tons of leg/seat room on the Zen King too. Now I want one even more. Bob had bought tons of parts for this thing. 155cc BBK, 2 different heads to choose from, valve springs, jets. uni filter, exhaust. variator, clutch springs, torque springs, roller weights, PDI stuff, tires, and more. We were ready to get to work.  We got the engine out, removed the stock aiibox and emissions equipment.   I started working on the engine while Bob started doing some PDI stuff.  This is where everything started going wrong. The big bore kit and heads that Bob has won't work on his engine. The stud and bolt spacing is slightly off.  Since the aftermarket parts wouldn't work, Bob port matched the intake, spacer, and head and opened the exhaust port up just a little and I stuck the engine back together. So the only engine mods are mild head porting and valves that are properly adjusted.  We decided to move on to the transmission, only to discover that it appears to be a 250cc transmission setup, so none of the trans parts will work either. Then we went to bolt up the exhaust and found that it wouldn't fit right. Bob's GY6 head clocks the exhaust flange a different way. Here is a pic of the two different heads where you can see the diffferent angles.  We stuck the engine back in and Bob installed a Uni filter, 38 pilot jet, and 115 main jet. After some test runs, he ended up with a 130 main jet. Now Bob's scooter beats mine by a couple of scooter lengths. It's pretty amazing how much of a difference mild mods made. We later gutted the stock exhaust, cut the rear fender down, and removed the luggage rack.  If anyone's looking for GY6 parts, Bob definitely has some around. Oh, Bob's studs are safe too. I didn't break any lol. The 150cc has beefier studs and it the nuts came off of them pretty easy. I'm now pretty sure the studs in my 50cc broke because they were overtorqued by the factory or a previous owner. |
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Post by 2strokd on Jul 16, 2009 21:34:41 GMT -5
So can you get after market parts for one? It did respond well to the slight mods didnt it? Looks better w/o the rack.
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 16, 2009 22:35:19 GMT -5
well iam working on that as we speak. I believe the trans stuff is out of a 250cc. the variator and clutch and belt are the same size as a 250. I ordered some springs and some roller weights. I am going to try them and see if they work. i emailed autotech355 on ebay to see if he has or knows of any bbk's or heads.
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Post by stepthrutuner on Jul 16, 2009 23:45:46 GMT -5
Did Bob not want to do rotational resection on that exhaust? Also those rollers can be drilled if done properly with plenty of lube. That cv butterfly spindle can be filed down too for a lot more flow through the carb. A lot more can be done with tools on hand. I hate waiting for parts! Did you know that the base diameters of the cams can be reduced by grinding down the heel a bit for more lift? This is possible because there is not a lot of spring pressure on this low side of the cam and the surface-hardened finish removed here will still hold up pretty well. Or a good machinist who knows what he's doing could apply the torch and then oil quench to reharden.
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Post by 90GTVert on Jul 17, 2009 6:15:53 GMT -5
We wanted to mod the exhaust, but it's stainless and we can't weld it. We thought about drilling the roller's but to be honest we weren't sure if the needed to be lighter or heavier and we didn't feel like drilleing hten having to fill, then drilling again, etc.. Engine RPM seems to indicate that he needs lighter rollers, but belt travel is probably somewhere near 1/2" from the outer lip of the variator. I told Bob to check his belt length. It's the same belt for a 250cc scooter, and lots of those have 12" wheels still, so I was wondering if the belt may be a bit short. Didn't know that about the cam. I used to have a custom cam shop about 7 miles from my house, but last time I tried to stop by there some other business had moved in.
The main problem is that both Bob and I were discouraged once nothing would fit and we couldn't seem to make anything fit.
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Post by stepthrutuner on Jul 17, 2009 8:57:40 GMT -5
Stainless can be bronze welded or braised can't it? I personally don't really know. But I would think so.
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Post by 90GTVert on Jul 17, 2009 16:17:33 GMT -5
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 17, 2009 17:28:42 GMT -5
well i ended up bending the exhaust pipr a little but got the exhaust to fit. looks very good. I also put on the pirellis, they were a bitch. the rear tire was very close to the tranny but it fit with a spacer. bike rides very smooth and somewhat predictable. tires grip well. going to get it tagged tommorrow. ended up getting it insured for 141.69 for a year.
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Post by 90GTVert on Jul 17, 2009 18:15:31 GMT -5
Post some pics of the exhaust. I'm especially interested to see a close shot of the bend. I can't figure out how you bent that thing and didn't crimp it.
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 17, 2009 20:45:28 GMT -5
its sorta crimped, not closed but not fully open, i dont think its gonna hurt anything, bike is much faster now. much more responsive. ill post pics tommorrow.
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Post by 2strokd on Jul 18, 2009 19:46:13 GMT -5
Glad at least one thing worked out for you. Looking forward to the pics...
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 18, 2009 22:33:36 GMT -5
well i ended up putting in 1500rpm clutch springs and a torque spring. it pulls preety hard up to 55. pics will be up shortly.
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 19, 2009 16:41:25 GMT -5
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