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Post by fupamychalupa on Apr 20, 2021 4:55:05 GMT -5
Ok, I bought a 2008 titan imports 150cc, 1p57qmj. I bought a 180cc big bore kit off Amazon and cannot get the cylinder to fit, what should I do? It stated that the kit was for the 1p57qmj and not the 157qmj, am I doing something wrong or just overlooking something small or what?
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Post by pinkscoot on Apr 20, 2021 8:33:08 GMT -5
Pictures would help. Show us what's not fitting.
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Post by fupamychalupa on Apr 22, 2021 12:49:21 GMT -5
I got it to fit, but cant get the flywheel to turn over completely. It will move back and forth but it's like it gets stuck or doesn't have enough room to complete a full stroke.
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Post by CrankingWithCG on May 9, 2021 1:43:18 GMT -5
Generally anything above "drop in" 171cc kits dont fit. You usually have to bore the block out. Maybe your crank is hitting the cylinder skirt? Idk, but all i know is most if not all 180cc kits need boring. Are you turning it over with the motor completely assembled or just jug and piston with no head?
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Post by wiscootsin on May 21, 2021 12:15:19 GMT -5
Like @crankingwithcg said, some kits don't fit.
If you look around on scootertuning.ca at 150cc gy6 kits, the site has things clearly marked as to what fits with and without modification. That can vary by who made the engine but it would be a start.
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Post by fupamychalupa on May 26, 2021 2:14:39 GMT -5
Ok, so, I figured that out the hard way,two 180cc cylinder and piston kits later. So, I put the stock cylinder and piston back on it with a straight exhaust, glixal variator and 13g rollers, new 24mm carb, intake manifold, 3 prong sparkplug, unrestricted cdi, new ignition coil, battery, stator, clutch shoe with 2000rpm springs, 1500 rpm center spring, and cold air filter. Took original airbox off and it had 3 hoses running to it, one from the valve cover, one from transmission case,and another big one from the pairs system. I think that is what it is,anyway, my question is will it hurt to run it without the airbox and just leave the hoses unhooked or is there a way that I can plug them off so I dont have to keep the airbox on it or what? I have an in line fuel filter on the one to the valve cover because that's how the hose on my lil 49cc tao tao was hooked up that went to the valve cover from the airbox and I put an aftermarket air filter on it and just unhooked the hose left the filter on and it didn't hurt it. The 150cc still starts and runs,but it still has a little sputter to it when giving it gas. Is there anything to do so I dont have to put the airbox back on?
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Post by scooter7878 on Jun 21, 2021 2:51:38 GMT -5
I didn't see anything about up jetting have u changed the main jet ?
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Post by scooter7878 on Jun 21, 2021 2:53:22 GMT -5
You may also have to move the needle clip in the carb two very important settings
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Post by fupamychalupa on Jun 23, 2021 16:16:13 GMT -5
Scooter7878, no I havent messed with the main jet, don't know the method or have any knowledge of the jetting on thm. What size jet would you recommend? And what position do i move the clip on the needle to?
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Post by scooter7878 on Jun 23, 2021 20:00:21 GMT -5
When does it sputter mark the throttle by the grip in 1/4 increments u need to find out where in throttle position the sputter it. Idle to about 1/8 throttle is generally either the air fuel screw or idle jet. From about 1/4throttle to 3/4 throttle is the needle clip setting and from 3/4 to wot is the main jet. in the cvk style carbs I generally start with the main jet so to do that get bike fully warmed up take it out where u can get a wot run long enough to let engine get to max rpm and see how it feels. If u get lack of power its probably lean and needs a bigg boss r main jet. If it loses up or sputters its probably rich. I always try to start on the rich side to avoid running lean and overheating. I would think ur main jet should be somewhere around 105 to 120 but that will depend on air density temp and elevation. take the 4 screws out and remove the fuel bowl the main jet is the one in the center it's the small one urs should be a cvk style with a 5mm thread. See what it is. Go a few sizes bigger and see how it feels. I go bigger till I get a performance decrease and less rpm at wot. Than I go one size back down u basically want the jet that gives u best performance and highest rpm at wot. Once u got that good u want the idle jet that idles good and when u just crack the throttle is smooth with no bog or miss. The ideal idle jet would leave the fuel mixture screw between 2 to 3 turns out. Start by engine off turn the mixture screw all way in do not tighten hard just till it bottoms out. Than turn it counter clockwise two full turns out. Start it. Make sure u let it warm up. Blip the throttle. it should be smooth right off idle. Turning the mixture screw in allows less fuel at idle leaning the mixture. turn that screw out allows more fuel at idle. when ur idle jet is correct it will idle good and between idle and 1/8 throttle will be clean no bog or miss and that mixture screw will be between 2 and 3 turns out. if u find the screw is out more than 3 turns to run ok u need one bigger idle jet if it's in more than 2 turns u need one smaller idle jet. One other thing I find the cheap jets u buy off Amazon or e bay suck. Buy a name brand set of idle and main jets. Naraku, ncy,polini, are all good. As for the needle clip google cvk needle clip it will show u how to change it but that clip settings affects the mixture between 1/4 and 3/4 throttle. moving the clip up makes the needle sit lower leaning the mixture at that throttle range moving the clip down raises the needle making the mixture richer at that range
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Post by scooter7878 on Jun 23, 2021 20:13:14 GMT -5
Theres a lot of vids on YouTube about jetting it might explain it better to be able to visually see what I'm talking abt if u not really understanding it cant hurt to just try one size up main jet and see how it feels they generally go in two numbers so if u got a 105 main jet try a 107 or 108 being to rich is better than too lean too lean overheats and blows cylinders to rich will just foul plugs and not run as well and maby get a little fuel down in the oil lean destroys motors. Google gy6 spark plug chop that's a good way to know where ur at but it takes a little experience. The idle jet usually doesn't need to be changed and is kinda least important ur idle jet size should be around 38 to 45 the needle clip and main jet are most important because that's the throttle position u spend most of time in and also where the most power is made
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