I try to cover every part of a BBK cylinder swap and information on cam swap. I believe in DIY and you will always do a better job than a shop if you do it yourself. I am installing a Naraku 100.52 kit on a IceBear Maddog 49cc Scooter.
I'm glad you're building 139qmb's and taking the time. The Naraku and Ssp-g kits all day! Me and some of my buddies over at S.A. mostly official are into building these lil engines up to show what they can do. This is my fourth build My 139qmb- #1 Uni filter 20mm round slide carb 20mm pit bike intake manifold Ssp-g 52mm 23.5/20.1 head Ssp-g titanium valve retainers Ncy cam Ssp-g 52mm flat top piston and jug Taida 44mm stroker crankshaft - 22 tooth sprocket Ncy ignition Ssp-g full exhaust system All emissions, vacuum lines and fuel pump have been deleted - gravity feed fuel line setup Ssp-g 89mm variator - longer ramps! Ssp-g drive face Gates power link belt Ncy clutch bell Ncy clutch Ncy secondary sheve 1,000 rpm clutch springs Stock contra Ncy contra ball bearing kit Ncy 18/46 secondary gears - 2.55 139qmb #2 Foam filter 20mm round slide carb Gy6 125cc 22mm intake manifold vs150cc 24mm Ssp-g 23/20 head pocket port, open exhaust to 18.8, mild valve deshroud and milled. Scooterarmy's S.A88 52mm dome top piston Stock crank Amazon exhaust No emissions b.s. 92mm TWH variator Ssp-g drive face Stock modded clutch and bell 1,000 rpm clutch and contra springs 17/49 secondary gears - 2.88
Cool. So my best results on variater so far have been a 95mm NCY dio variator I modified. I have a 89mm NCY one also. I was hoping to make this polini 95 work, but so far does not seem that great. Do yall use the 89mm then?
Mine? 81cc big headed bitch wit high lifting cam because it's stoned wit 64mm rockers from rolling wrench Denver an 72cc piston in its own hole from gy6 racing an NYC CVt with tight spring. Bando wide belt . Bando ignition coil. Adjustable cdi. I forgot who's probably a lie. Lights are hand made by me . Carb ... Pwk built by Matt from rolling wrench hopefully.
@@GhettoWrenchSame, I'm just now figuring out how to find replies to comments on here. I just got the high pressure fuel plumbed in on mine with an intake referenced regulator and I'm about to test ride it using a PZ20 carb I put on last week. The process of figuring out what the hell I'm doing with the high pressure fuel loop was confusing and convoluted because I had to dig through a lot of different info, and in the end trial and error taught me things I would probably have had to do a lot more reading/watching to figure out. It's overkill, but I was able to reach the 1.5psi I was aiming for down from 125psi the pump rockets out.
Excellent video! Thank you! I have a stock 150cc. Big Bore is next. Out of the crate, I got just about 52mph. I did a Nibbi carb upgrade with an exhaust upgrade. A little bit of carb tuning, I'm at 58 to 59 mph. No CV tuning. Running bone stock. Hoping that with a big bore kit, and some CV tuning, I'll get 65 mph our of it. Thanks again for another great video!
Your welcome. I love the 171 kit on my black one. When you get to 68mph stop. Don't do the rear end gear up mod. The 70mph speed is just bragging rights. The bike was funner and better before the gears. Def do the 115mm variator and 842 belt AFTER the big bore kit. It is good everywhere.
@@GhettoWrenchthanks for the 70mph tip! I live near a a pretty major road hers in Florida, and I just didn't want to get run over doing the 55mph speed limit. LOL! It's always good to have some spare speed in the reserve. Thanks for the reply, looking forward to your next one!
I heard about gy6s for years, the robust, standardized true engine for scooters and small bikes, but I didn't know it was a swing arm. I want to mount it on a minibike.
Good way to get a swingarm on the mini I guess. Just make the mount like an axle or a swingarm pivot and run a shock from the frame to the rear case. Shoukd be doable. DO a 150 tho. Cheap on ebay and come with all the stuff like CDI and coil.
@@GhettoWrench Yeah, I would be happy with a hardtail, but free rear suspension, won't complain. I want this 50cc 2 stroke, I like 2 strokes, and I don't plan on highway use. And I could potentially weld some faux bicycle pedals on it and claim it as a motorized bike. It would be safer if they were both fixed forward anyway, I plan on having full signals on it.
I will be interested to see your thoughts on the Naraku parts. I have had nothing but bad luck with their stuff. Probably just picking the crappier stuff they make, but who knows.
100% Agree. And before I hated the brand I had used this 100.52 kit and had great luck with it. Kinda hoping it melts so I can try the Taida 88cc kit for comparison.
Ted, take the extra 5 mins and take the engine bolt out and take the engine out of the bike, way easier to put the engine on the table then mess with it on the floor
I agree. I only did it that way cause everyone has an on the bench video and I know a lot of guys do this in the bike. But right.... I'm too damn old to be laying on the floor like that.
banger of a video! i have a question if you dont mind, my qmb 139 is running loud as heck, i just had it rebuilt and its making alot of ticking and or clicking and seems to be running kinda weird, im 99% sure its my valves but what do you think
Prob the Valves like you suspect. May want to give the CVT a good check out for loose stuff also. Mechanics have to rush or they don't make any money. They make a lot of mistakes. Do your own work and it will always be done better cause you can spend 2 days on something a shop would only allow an hour. Checking your valves is easy.
I've done 3 or 4 went the same shit . Broke top ring. Sir clip went thru cylinder an scored it on a 200$ 51mm complete kit top to bottom. Now I've got the top half of 51mm kit . Rockers cam an head on a 47mm piston an cylinder that came together. A rolling wrench pwk carb uni filter an the boot is like 24 25 mm an the head that's for a 80cc or whatever the intake hole is 50cc size.
None. CVT transmission so can't really over do it. Airplanes, chainsaws, race engines go right from the bench to pinned. I stopped doing a "break in" after watching the pros break in bikes under a load on dyno and always made more power. But that's a whole debate all over google. LOL
on stock crank ? you're couragous man ! stock crank on 139qmb are made of paper lol. people used to put kymco crank. still bad but 5 time better. but i imagine you're getting the famous naraku hd crank soon ?
If there anything like Naraku belts they will break in 100 miles. LOL. I have another one of these on a stock crank and regularly sees 10k. No issues yet.
@@GhettoWrench naraku belt are the best belt i had yet, beside bando. thats because naraku belt are bando belt. other were all snapping. be it cheap noname, gate, malossi.... maybe you got bad one or fake ?
@Broken_AK47 I may have Def had a fake then. Went thru 2. Lasted about 100 miles each and shredded and broke. Figured I had a CVT issue. Put the worn out Gates back on and never failed. So bought a new gates and they wear thin eventually but don't break. Where do you get your Naraku belt? Cause they are the only one that make the actual correct size. I got mine off ebay.
@@GhettoWrench Then it was a knockoff. You'll know a real Naraku and Bando belt because you CAN'T get them for cheap... Because we're the importer for both brands for the USA so we determine the prices. If you see either for what seems like a substantially more affordable price than you see on the PFS website, you now know why.
My piston says IN on it . I just put on a pwk . I got spark . I got compression. Im using gas in a bottle that's sitting higher then the carb. The carb intake boot is bigger then the head inlet. This carb I'm told is for then bbk head. The manuel choke on it doesn't stay up almost like it's for a cable. Idk. Bike hasn't run in weeks an I can't get it to. Strugglefest '24
