jmkjr72
contributing staff
Commander 132nd Northern Cav. Division
Posts: 2,779
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Post by jmkjr72 on Jun 2, 2009 17:09:55 GMT -5
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Post by Rebel on Jun 2, 2009 22:27:02 GMT -5
Nice find, I wonder if that is the kind of thing that Dr Pulley does to improve theirs over stock.
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Post by 90GTVert on Jun 3, 2009 6:13:19 GMT -5
Aftermarket variators often change angles there and increase the travel of the rollers inward and outward and other aspects. Another advantage is that some change roller size. My new variator uses 16x13mm rollers, the stock vari uses 15x12mm. I'm finding it easier to get whatever size rollers I want from US sources now since 16x13mm rollers are used in the more popular 4 stroke scoots.
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2strokd
Non-Com
Still takin notes...
Posts: 176
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Post by 2strokd on Jun 3, 2009 7:20:33 GMT -5
Thanks for the link on variator mods jmkjr72 , looked very interesting, i havent thought of those kinda mods yet. I might try that someday, but i want an extra just in case i mess up the stocker. I think i lost some power more than anything. With the same setup my scoot used to get to 50mph pretty quick(1/8 mile or so), now it gets to 45 pretty quick then just mopes its way to 50+, not so much + anymore . Like i said before, the compression isnt what it was before i made carbon ring toast out of my piston. I guess that kinda makes sense though . I am thinking about adding a base gasket today to raise the ports a bit and see if i get some more power back up on the top end. I havent had one in sense i got it back together. The problem with adding a base gasket is that at TDC my piston is still a millimeter or so in the barrel. Should i add a base for better timing, and then have the cylinder machined so im getting full use of the stroke?
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Post by 90GTVert on Jun 3, 2009 7:38:04 GMT -5
I'd try just installing a base gasket first and seeing what the results are. You need to be careful milling down any 2 stroke and be especially careful with yours since you are on the edge of spark knock.
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2strokd
Non-Com
Still takin notes...
Posts: 176
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Post by 2strokd on Jun 3, 2009 17:16:01 GMT -5
I made a base gasket out of some .75mm material i have. That put the piston about 1/2mm from the deck at TDC and im clearing the exhaust port almost all the way at BDC. Thats better than i thought it would be with a base gasket that thick. After i put it in i was reving it on the center stand and it seemed to be running rich, and was floating out about 9,000rpm or so. I dont recommend reving your scooter way out to the redline on the stand without a load on it, i was doing so in short bursts. I tried moving my clip down one on the needle and that helped a little, but not enough, so i switched my 85 main out for an 80 and that helped out more. I figured since the piston isnt coming up as high now, and the compression should have dropped i might try a long shank plug again, so i put one in also. I went for a short ride and it pulls better throughout the whole range. I didnt notice any spark knock this time ;D. I was so having so much fun i almost ran out of gas....Thats why my ride was short lol, plus its rainy, chilly, nasty here today .
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jmkjr72
contributing staff
Commander 132nd Northern Cav. Division
Posts: 2,779
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Post by jmkjr72 on Jun 3, 2009 18:16:42 GMT -5
wow only an 80 on an 18mm carb im running an 85 on a 14mm carb and 50 cc with premixing i would have thought 105 to 110 for a main
what is your squish set at in a perfect world .8mm is ideal but with a stock crank i would stay 1.1 to 1 just to keep it safe
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2strokd
Non-Com
Still takin notes...
Posts: 176
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Post by 2strokd on Jun 3, 2009 18:42:20 GMT -5
I havent checked the squish yet, all get back on that one. I never check the squish clearance, not much you can do to change it other than taking out the head gasket(mines the o-ring type so i wouldnt make a diff), or changing the base gasket thickness, and i dont have another 70cc head to play with. Yep 80 main in a 18 mikuni with 70cc,s. Vert has brought it up in the past but sometimes with more cc,s comes more vacuum witch draws more fuel requiring the same size, and sometimes smaller main, and even pilot jet. As long as its not lean i use the smallest jet i can. I learned that one the hard way. My scoot runs smooth as silk at idle with the stock cylinder with a 32 pilot, but with the 70jug on it runs rich at idle with a 32 pilot The theory seems to be correct, at least for me its turned out that way
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Post by 90GTVert on Jun 3, 2009 19:06:33 GMT -5
It's just the laws of physics at work, regarding the larger piston creating more vacuum.
If you think an 80 main on an 18mm carb on a 70cc is small, mine is a 99cc using a 25mm carb and a 100 main jet right now. I spent a good bit of time swapping around between no stuffer, stuffer, different intakes, smaller carbs, differnt jets, etc.... Other people with setups like mine run 125 jets in 19mm carburetors and there is no way I can get over 110 main without serious rich bogging with any carb/intake/reed setup I own. Just last week I tried swapping every jet from 95 to 115 in and changing clip positions around and a 98 or 100 main is best for me. I stuck with the 100 just to be toward the safe side. I could understand if I was at a higher elevation or something, but I'm only 45ft above sea level. This is why I hate jetting questions and never give anyone an answer as to what specific jet they will need.
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2strokd
Non-Com
Still takin notes...
Posts: 176
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Post by 2strokd on Jun 5, 2009 7:49:08 GMT -5
I NEED A PIPE !!! A friend of mine stopped by yesterday with his R4 clone. We were tinkering with our scoots, checking the differences in the too. I couldnt help but notice how much different the shape of his Leo Vince ZX pipe was over mine. The Leo header pipe was a two phase(or stage) and seemed to flow into the diffuser allot better than mine, the diffuser is longer, it tapers off slowly from the header, and is not near as big around as mine, it seemed to have almost no belly section, the diffuser looks like it goes right into the baffle witch is shorter also. After all of the looking and mental note taking i couldnt help but ask if i could bolt it up for a run. Of course he said yea lets try it out. First i took his pipe off and measured the ID of the header were it bolts to the cylinder and it was 23-24mm over my 21-22mm. So i bolted it up to my scoot and go for a ride.... ;D ;D ;D, I need one bad. My scoot probably gained at least one honest HP all the way around the tach. I couldnt believe the change in it. I went from pulling up a little to do a wheelie to almost wrecking because i did one by accident just trying to turn around . And the thing that got me was the ZX is known for its lack of low-end power. We put my pipe on his scoot, but that was pointless. It was like we tied a boat anker to it. I new i had a bad pipe, thats why i wasnt afraid to cut into it. I didnt think it was that weak though. This whole time i could have had more power, and all because, aaahhh never mind . Im glad we did that, now for a better pipe
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Post by 90GTVert on Jun 5, 2009 20:45:19 GMT -5
From listening to you and Reg, it sounds like I need to build a good 70cc. They both sound more impressive than my 99cc. I sure don't do any accidental wheelies.
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stepthrutuner
Cadet
J Lo/Piaggio.... "I can't wait to ride with stepthrutuner."
Posts: 26
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Post by stepthrutuner on Jun 6, 2009 15:49:08 GMT -5
I really like the way those Leo's look. They look like they should pull up the mixture through the transfers over a very broad range of rpms. I think my skinny modded Technigas NextR is killing a lot of power and may be screwing up my carb's vacuum signal around 9500. The scoot seems to want to quit pulling about there. I've got to get my tach to going or replace it. A couple of months ago I could have bought a barely used ZX for my scoot on eBay for $70.00. I really wish I had bid on it now.
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stepthrutuner
Cadet
J Lo/Piaggio.... "I can't wait to ride with stepthrutuner."
Posts: 26
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Post by stepthrutuner on Jun 6, 2009 16:03:25 GMT -5
I really like my TP kit. I built it with the base and head gaskets that came with it. It seems to like regular gas just fine. It seems to be every bit as quick as my AIRSAL T6 and I know I won't have any issues with the bore plating letting go and fouling my piston and rings. It is the Trophy Series. I recommend this kit as being very high quality.
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2strokd
Non-Com
Still takin notes...
Posts: 176
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Post by 2strokd on Jun 6, 2009 19:26:19 GMT -5
I really like the way those Leo's look. They look like they should pull up the mixture through the transfers over a very broad range of rpms. I think my skinny modded Technigas NextR is killing a lot of power and may be screwing up my carb's vacuum signal around 9500. The scoot seems to want to quit pulling about there. I've got to get my tach to going or replace it. A couple of months ago I could have bought a barely used ZX for my scoot on eBay for $70.00. I really wish I had bid on it now. I noticed that about the Leo pipes too. The transfer from header to diffuser is a nice smooth one verses other pipes. I am getting a pipe ordered today I fixed my tach. The signal wire wasnt getting good contact. I ended up using a zip tie on the plug wire to hold it, i was using tape. So far so good.
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2strokd
Non-Com
Still takin notes...
Posts: 176
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Post by 2strokd on Jun 6, 2009 19:30:56 GMT -5
From listening to you and Reg, it sounds like I need to build a good 70cc. They both sound more impressive than my 99cc. I sure don't do any accidental wheelies. I dont think im making more power than you buddy . Im a bit higher than 45feet above sea level The only reason i did a lil pop up when turning around was cause i wasnt used to it coming on like that when the clutch engaged at about 4,600rpm. My intent was to just burp the throttle.
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