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Post by lshigham on Oct 31, 2010 11:36:53 GMT -5
The "tink tink" of a screw falling into the crankcase and the feeling you get afterward usually serves as a good reminder to stuff a rag in there on future endeavors. lol Yes, not something I'm going to forget in the future. I had to remove the airbox yesterday, it had cracked. I replaced it with a foam uni style filter, a relic of my 139QMB project. Oh, the joys of up-jetting! It's running fine with a 130 main, quite staggering considering I started off with a 53! I suspect with the 21mm Delly I will end up with jetting in the 150's I have two brand new 6mm Delly jet packs covering 50-100 in increments of 2-3. Obviously, they are of no use whatsoever to me, so they are going free if anyone can give them a good home.
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Post by 90GTVert on Oct 31, 2010 12:10:18 GMT -5
Wow, that thing sucks down some fuel! I'll be interested to see what mileage you get when it's all dialed in.
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Post by lshigham on Nov 2, 2010 16:29:09 GMT -5
Got 48MPG from my last tank, riding mostly at 50-60 MPH.
21mm Delly is in and ready to go tomorrow. It makes my 17.5mm stocker seem puny in comparison! Unfortunately, it uses 5mm jets, not 6 as I was told. It was shipped with 6 jets, going from 80 to 105, so it looks like I will be drilling them to get a ball park figure and purchasing more precise jets when I know what range I'm looking at.
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Post by 90GTVert on Nov 2, 2010 19:17:00 GMT -5
I didi the same thing. Ordered my 21mm Dell thinking the 6mm jets from my 24-25mms would work.
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Post by lshigham on Nov 3, 2010 10:07:23 GMT -5
Installed and ready to go It was a relatively painless operation, just a straight swap. I even reused the cable connector and tensioner from the old one, it screwed straight into the new slide top. The biggest problem was persuading the spring that it does want to go into it's correct hole, it's a lot stronger than the predecessor in the 17.5mm. I've checked and the slide is clearing the top, so all good there. I've tuned the idle mix and speed, I'll take it for a test ride after tea.
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Post by 90GTVert on Nov 3, 2010 11:01:33 GMT -5
Nice. That's how all carb swaps should go.
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Post by lshigham on Nov 3, 2010 11:53:49 GMT -5
Nice. That's how all carb swaps should go. Ah, didn't think that it could go this well. Nothing goes well with my scoot It would appear that the new carb is more efficient at getting the fuel atomised, I started with a 100 that was included and that was way too rich. Ended up walking home after it fouled out and wouldn't stay running.
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Post by 90GTVert on Nov 3, 2010 12:00:04 GMT -5
Odd. Mine came with a 92 main stock. Is yours the racing black edition or the standard?
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Post by lshigham on Nov 3, 2010 12:17:29 GMT -5
Odd. Mine came with a 92 main stock. Is yours the racing black edition or the standard? The black racing one. Rather irritatingly, the stock jet isn't labelled.
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Post by 90GTVert on Nov 3, 2010 12:43:33 GMT -5
Hmm. Mines the racing version too.
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Post by lshigham on Nov 3, 2010 13:26:37 GMT -5
Which scoot did you use it on? I'd be interested to hear what jet size you used, as it should give me a good ballpark figure.
I would expect the jetting to be in the 90's with the 21mm, I wonder if there was something wrong (air leak?) with my old carb?
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Post by 90GTVert on Nov 3, 2010 13:30:40 GMT -5
It's on my 96cc Venus. Haven't tuned it yet, sorry. Coulda been a leak somewhere causing the big jets. Usually jet size increases with carb size, not decreases.
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Post by lshigham on Nov 3, 2010 13:38:39 GMT -5
It's on my 96cc Venus. Haven't tuned it yet, sorry. Coulda been a leak somewhere causing the big jets. Usually jet size increases with carb size, not decreases. Yes, logic would dictate that. My scoot never seems to be bothered with such foibles such as that If there was it a leak it must have been in the carb, unless it magically resolved itself when the carb was changed. I'm not going to dwell on it too much, now I have jetting in a range that jets are readily available for. I was getting worried as over 150 they get quite sparse. I shall go and try a 90 now.
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Post by lshigham on Nov 5, 2010 14:42:22 GMT -5
I found the problem with the new carb - stuck float valve.
As for the unusually high jetting. I spoke to a guy who tunes 50cc Minarelli and Piaggio's for a living. Their thoughts:
-130 main is way too big, the highest seen on a Gilera Runner 50 is 110 -Possible crank oil seal leak -The City 16 isn't suitable for anything that can be used on the road, I'm better off sticking to the Z -The best way to get the bike in tune is using a dyno and A/F gauge.
I'm inclined to agree with them on all points, they haven't lead me astray before. I'm in the process of re-spraying the Z and reinstalling it with the unstuck 21mm carb.
Oil seals for both sides will be replaced tomorrow as a precaution. The intake area has been leak tested, so there isn't anywhere else to choose from. Apparently the seals can be replaced without removing the crank. I'm going to get the tune somewhere near before getting them to fine tune it on their dyno next week.
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Post by 90GTVert on Nov 5, 2010 15:10:06 GMT -5
Even a base gasket not sealing could do it. The reason I wouldn't have thought of either is that it changed when you changed carbs. Probably shoulda done a pressure test at the time to see what was up.
I'm sure it is nice to tune on a dyno. Over here, that would be hard to come by in most areas. I stand by using a test strip and taking note of speed, rpm, feel, and plug checks. The dyno and a/f just makes it fast for them. We gotta play around and look for the things I mentioned above, they just look at a computer screen. You should watch if possible. Get us a vid!!! ;D Definitely report the horsepower!
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Post by lshigham on Nov 5, 2010 15:28:09 GMT -5
I think if the base gasket wasn't sealing I would find myself sitting in a large pool of coolant, the transfer channels are run within the coolant channels. I'd agree about Dyno's being hard to come by - the nearest one that has the facilities for measuring A/F on a 2T is 100mi away! There is one in the next town, but they don't have any sensors that can measure A/F on a two stroke, the oil buggers up most types. I've been promised at least 15HP, so we shall see. I'll definitely get a printout
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Post by lshigham on Nov 5, 2010 16:32:42 GMT -5
The Yasuni Z, cleaned up with meths and steel wool. Attachments:
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Post by lshigham on Nov 5, 2010 16:33:33 GMT -5
Bracket in the cleaning up process. Attachments:
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Post by lshigham on Nov 5, 2010 16:34:11 GMT -5
First coat. Attachments:
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Post by bigdorkfoot on Nov 5, 2010 19:40:59 GMT -5
gotta find that leak man!!! if your oil seals were leaking, the bike would not run. How are you checking for leaks?
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Post by 90GTVert on Nov 5, 2010 20:12:16 GMT -5
It could still run and run pretty strong with leaking seals, just depends how bad they leak. 2strokd was doing power wheelies and some pretty good speeds with leaking crank seals.
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Post by lshigham on Nov 6, 2010 3:31:57 GMT -5
gotta find that leak man!!! if your oil seals were leaking, the bike would not run. How are you checking for leaks? Leak detector spray - really useful stuff. I just spray it round the intake manifold when the scoot is on a fast idle. I know it works, as I have found a small leak and rectified it. I'm going to replace the crank seals as a precaution later today.
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Post by lshigham on Nov 8, 2010 5:58:41 GMT -5
Before checking for leaks I decided to try the freshly painted exhaust. Much easier to ride in traffic, but now way too rich. I wonder if the fuel ''leak'' was just the unburned fuel disappearing down the pipe?
I have a new float bowl gasket for the 21mm carb, so I should be able to get that in and tuned soon.
I have experienced a 5mph top end loss, but I should be able to get it beck with jetting and roller changes.
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Post by lshigham on Nov 9, 2010 16:33:35 GMT -5
Jets and gasket for the 21mm arrived today so that's a job for this weekend.
I'm trying to get the more co-operative 19mm in tune first, the correct jetting does indeed seem to be 110-115. I had a mechanic run a leak down test, it's fine. That saved me the trouble of replacing perfectly good seals!
I'm also going to try and increase compression. The cylinder is supplied with 3 base gaskets, thick, medium and thin. I'm currently using the medium one, I may try it with the thin one and regular 95 RON gas to see if I can squeeze any more power out of it without knocking.
Also, having a few problems with the final drive, or more specifically the shaft that the clutch sits on. There is a good deal of play in the shaft, it's so bad that I think that it would have fallen apart if there wasn't a bearing support in the CVT cover. I'm getting the same mechanic that installed the gear kit to take a look at that tomorrow after lunch, the gear kit changes the drive ratio on the other shaft, so I know it isn't that.
I have some 4.5g rollers to replace the too heavy 5.3g - 11500RPM here I come! At the moment it's revving up to 11000 and then being forced down to 9000 when the CVT gets it's butt into gear. This is seriously restricting power when the cylinder used is ported for 11000+ Went past a radar sign earlier today at an indicated 40, the sign said 39 mph. Good enough for me ;D
Gas mileage is up at about 60MPG. A good thing when a gallon earlier set me back £7+1.25 in oil.
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Post by 90GTVert on Nov 9, 2010 19:18:52 GMT -5
If you don't have one already you might wanna try a torque driver with straight slots at different angles to keep the revs up throughout the "gears".
If gas was that high here, I'd probably need to stop riding. I couldn't even look at the cars. lol
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Post by lshigham on Nov 10, 2010 4:01:23 GMT -5
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Post by lshigham on Nov 10, 2010 11:01:10 GMT -5
The final drive is now fixed and rollers dropped down to 4.5g. Cost me £10!
I'm still unhappy with the top end power, it's revving at 11000 RPM but is completely gutless. I hate to say this, but I may have to convince the C16 to work. With that as soon as you hit the power band you would be in the hedge before you know it! It's also too rich WOT, it's fine up to 3/4 so I'm going to down jet and move the needle down a clip if need be.
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Post by lshigham on Nov 11, 2010 12:17:04 GMT -5
I've scrubbed up and repainted the C16 - flat black, of course. I'm sure you will approve, Brent Used a different brand of paint this time, I much prefer the coverage and drying time. Top speed now 61mph at 10500, down from 65 at 9000 with the 5.3g rollers. I was getting 68 at 10000 with the C16 and current cylinder and 72mph with the old cylinder ported for 10000, also with the C16. To simplify: Attachments:
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Post by lshigham on Nov 12, 2010 2:31:07 GMT -5
C16 painted - I got a bit carried away and did the muffler sleeve as well! I've downjetted with my current setup (to a 110) and an going to give it one last try.
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Post by lshigham on Nov 12, 2010 4:09:38 GMT -5
110 was too lean, I'll try 115.
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