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Post by 2strokd on Apr 3, 2013 7:53:55 GMT -5
Dude!Leave it rich at part throttle!!More pistons are fried at low throttle settings than wide open.. When a 70cc piped motor is tied to a stock sized carb,things get reaaal hot at part throttle.Be happy with the rich blubber and crack the throttle WFO to make you and the engine happy! True dis!!! Get a head temp gauge and watch those low-mid throttle head temps go up, up, and away! Fighting this with a mild 70cc and a stock 16mm carb on my truck now. Only way it will run good without overheating is if i run it pig rich on the low-end. Your scoot sounds good in the vid  |
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Post by oldgeek on Apr 6, 2013 14:34:26 GMT -5
I just got back from a scooter ride with my wife, and my 12 year old daughter. I froze cause I wore shorts, and no jacket, and it is still a little cold here, but next week we are over 70 all week, finally back to normal for this time of the year.
I am really surprised that my 70cc did well in the stop and go traffic of the boulevard, (pretty busy down there, tourist season if definetly here). I thought for sure it would sieze, but it did not even smell hot. I really need to get a CHT gauge for it, so I can get a better picture of what is happening as I ride at different speeds.
I am starting to really like this CVT setup that I arrived at by accident. I need to get variator weights dialed in just a tad better though. It revs just a little too high with the 5.5 sliders in, but the 6 gram sliders gear up a little too quick.
I think I will try filling the 4 gram sliders I have with silicone or something and shoot for around 5.75 grams.
Just keep riding,
Scott
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Post by PIG on Apr 6, 2013 15:41:49 GMT -5
Why not run 3 5.5's and 3 6.0's? That should get you what you want.
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Post by oldgeek on Apr 6, 2013 17:11:30 GMT -5
All I have to work with are 4G,5G, and 6G weights. I was mixing the 5's and the 6's to get 5.5
Just keep riding,
Scott
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Post by oldgeek on Apr 9, 2013 10:39:23 GMT -5
Well, I pulled the CVT cover to switch clutch springs, and was greeted by a variator slide bushing laying in the bottom of the cover. Turns out that only 1 of the three was still in place, and it was about to fall out too. Just a little damage to 2 of the rails, I think I can smooth them out ok.
Which bushings do I order for the Hoca variator that uses 16x13 weights?
I have no idea what may have caused this to happen.
When you assemble the variator, are you supposed to very lightly lube the boss? I have been doing that, but this time the grease was discolored, and looked overheated.
To top it all off, I found the air intake connection to the carb leaking slightly, so I put a hose clamp on it. Now it is rich as hell, and I need to start all over with the tuning.
Just keep riding,
Scott
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Post by 90GTVert on Apr 9, 2013 14:56:08 GMT -5
I order stock GY6 50 bushings from ScrappyDog. About the cheapest place I know to get them. If you find a cheaper reliable source, post it up. I break them pretty regularly.
You can set the variator face down with the drive boss and whatever spacers you use in place under the ramp plate and see if you're past the travel you should have. If the plate goes beyond the guides on the vari it'll break them fast. Otherwise, I think it may be a poor design to handle much power being applied. Even the GY6 folks report breaking them with big bore kits and especially once stroker cranks are involved. Kind of a shame that the stock vari has such beefy slides, but it's not worth a damn for a modded motor.
I think you can get Dr Pulley slides from Parts For Scooters, but I dunno if they will fare much better for the added expense.
I don't lube the drive boss. I just make sure it moves freely, and polish it if not.
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Post by Corrosion on Apr 9, 2013 18:56:32 GMT -5
You need a splurge trip to Harbor Freight. Get your self a Vise.
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Post by oldgeek on Apr 9, 2013 20:29:05 GMT -5
You need a splurge trip to Harbor Freight. Get your self a Vise. LoL! shopping always helps! I used that cresent wrench trick you pointed me to on youtube, and it works like a DREAM! Ill NEVER go back to a vice to disassemble the clutch. (but I still could use a decent vise!) www.youtube.com/watch?v=aEDdglsl9PMJust keep riding, Scott |
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Post by oldgeek on Apr 14, 2013 20:31:01 GMT -5
New problems popping up...
Saturday was really nice around here, so my wife, daughter, and I took an almost 2 hour ride on the scooters.
We had a blast, and my 70cc ran great even though I had the stock variator on it while I wait for new slides for the HOCA.
My problem started after I let the 70cc set for about 2 hours after the ride. I started it up to go for a spin, and it would not take the gas. I figured the plug was a little fouled, and thought it would clear up, but it never did. I finally realized that it was very lean for some reason.
Today I checked the plug, and it was ok, but I changed it anyway. I then checked the air box, and intake, but could not find any leaks. I checked the gas delivery to the carb, and it is fine. I went through the carb, and it is spotless. I checked compression, and it is still 140 psi using the starter.
I am thinking the air is right, but its just not getting the gas for some reason. I really don't know what is going on at this point. I wonder if the reeds could be the problem?
Anyone? Ferris? Anyone?
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Post by 90GTVert on Apr 14, 2013 21:27:09 GMT -5
The most common issues with reeds are usually not sealing or broken reeds. That tends to deliver too much fuel.
Air/vac leak. Petcock malfunction. Clogged line/filter. Improper float height.
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Post by oldgeek on May 12, 2013 9:38:21 GMT -5
Well, I finally found out what was going on with this scooter yesterday. I have been pulling my hair out for nearly a month off and on trying various things. I actually had 2 issues, the 10% ethanol fuel like I mentioned in another thread and this: Do you see the problem here?  Now you can see it!  I finally realized the other day I was having ignition issues. I started looking and decided to change the coil. That fixed it, but only for a while.  Yesterday I drained out the 10% ethanol gas and refilled it, and I still could not get it to run decent so I started digging deeper. I noticed the gap between the pickup and the flywheel was excessive, and went to adjust it and it was cracked. Just another thing the PO screwed up on this scooter. I am pretty sure it has been this way the whole time, and the vibration finally loosened the screw on the other side just enough to let it move some. This is probably why I have had intermittent problems with this scoot the whole time.  Anyway I slapped a spare stator I just happened to have laying around, and away we rode! The beach is starting to get really busy, we had a good ride...until my throttle got stuck. I turned it and it jammed at just over 1/2 throttle. I used the kill switch to drive it to the house! No big suprise it jammed on me, I have had the carb top off so many times changing the clip needle position, that the cable was frayed. So here I go out to the shed to fix that, hopefully! Here is a picture of my 12 year old daughter. We let her drive the scooter yesterday, and she did really well. She learned to ride on a honda XR50, and the scooter was a pretty easy transition for her .  Just keep riding, Scott |
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Post by 90GTVert on May 12, 2013 10:51:27 GMT -5
I had a pickup mount break off completely before and leave me stranded. Mine would die at stops and act like the mixture was way off when running, I assume when one side was still attached. At least you got it before it made you walk.
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Post by oldgeek on May 12, 2013 13:24:18 GMT -5
I had a pickup mount break off completely before and leave me stranded. Mine would die at stops and act like the mixture was way off when running, I assume when one side was still attached. At least you got it before it made you walk. I believe this thing has been playing with me for a while now. Never left me stranded, but damm near did several times. Looks like I wont be needing that Dell PHBG for now, might actually be able to tune the stock one since I fixed this problem. I really don't have the $$$ to spend on a carb right now anyway. Just keep riding, Scott |
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Post by Corrosion on May 12, 2013 15:19:37 GMT -5
Good that you have the spare parts. I wonder how it got that way? Did you set the Air Gap when you were trying the different flywheels?
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Post by oldgeek on May 12, 2013 20:35:08 GMT -5
Good that you have the spare parts. I wonder how it got that way? Did you set the Air Gap when you were trying the different flywheels? Sadly, I must admit I don't recall "checking" the air gap...ever.  Other than a quick visual check to make sure it was not excessive. I know it is supposed to be fairly tight, I think I saw somewhere around here that it is .28? Just another important thing I overlooked doing! Went on a few rides today. The universal throttle cable I just put on came loose right on the boulevard in front of the police alley at the Bowery. The end at the twist grip came off. It has a set screw to attach it to the end of the cable that I did not think would hold. I managed to reattach it on the spot (after talking nice to the policeman to allow me to park it there for 10 minuets) I babied it home, and whipped out my oxy/actl rig I use for work, and brazed it up with some 15% silver alloy. Some flux and some higher silver content braze would have worked better, but I think this will hold fine. I used the rotary tool to clean up a bump of braze, and the cable sticking out of the end of it. Got it all back together and went back out for a test run. It worked fine so far, but we will have to wait and see if it holds up. Just keep riding, Scott |
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