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Post by buzzbug on Jun 15, 2014 5:40:48 GMT -5
Hi again,Walter.Im hoping you may be able to shed some light on my engine ?.We bought a new GY6-180 motor,[supposedly],i ran it for 2 race meetings,but it was slower than our old 163cc GY6.Today we pulled it down to start the new build and found its actually only 168cc and the valves are smaller than the 150['that explains a few things !].Im now wondering if we have a "B" case or some oddball thing.The stud spacing is definitely 57mm and the engine # is 161QML ,are you able to figure out what we have from this?,there doesnt appear to be much "meat" around the studs for a BBK and still have good gasket sealing area,im a bit concerned about shipping parts 5000 miles and finding they dont fit .Thanks !!
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Post by buzzbug on Jun 14, 2014 23:14:22 GMT -5
Hi thanks,I should have mentioned,we run 2 karts and this new motor is for the other kart,also the cc limit is 200 cc [for junior grade] but would get away with a couple more cc's.So are you saying the stroker would be better then ?.If so could i stick with the 61mm bore and put in a 8.2mm stroke crank ?.I think I'll definitely try the taida big valve head either way.heres a link to a youtube video of our club racing .Not our kart but gives you an idea of what we do.
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Post by buzzbug on Jun 13, 2014 19:29:29 GMT -5
Hi,Im hoping you can help me with parts/advice,im in New Zealand and we run a pr of racing grass karts with GY6-150 motors,currently the fast one has a 196 63mm/6mm stroker and 4 valve head etc,we want to build up a "B" case motor 65mm x 3mm stroker and big 2 valve head to see how they compare or would you reccomend staying with the 63mm/6mm crank ?.Can you supply,crank,head and Cyl kit ?,Thanks
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Post by buzzbug on Jun 8, 2014 15:39:23 GMT -5
Will do....most of the other karts are powered by Lifan 200 dirtbike motors [5 spd] Her new kart pulls away from them down the straights whereas the old one [in the video] used to loose ground and catch up in the corners.I,ll mount the camera on her helmet next time [lol].
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Post by buzzbug on Jun 8, 2014 0:14:00 GMT -5
Hi again,we finally got the 4 valve head to work on the GY6,it seems the cam supplied is quite a way out and caused a lot of headaches,we ended up making one and used a yoshimura grind for a 4 cyl race bike and it works great.So this has a 63mm bore and 6mm stroked crank for 196cc,seems a good size and under our 200cc limit for racing.
So now next question,Im trying to find a supplier with good quality parts[cranks 6mm] who also sells BBK spacer and gaskets for "B" case engines,I cant find anyone online who does and as freight to New Zealand isnt cheap,I dont want to go shopping at several suppliers.
Hope someone can help,as we are building another engine,same specs but with a big 2 valve head,just so we can compare them.
Thanks
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Post by buzzbug on Jan 7, 2014 23:23:26 GMT -5
heres a couple of pics its code is 157QMJ its a kazuma 150,as I said all common GY6 parts interchange except head/barrel,the 2 long 6mm bolts are slightly different spacing,the 4 head bolts are the same.I used this as it was a lot easier than making a top mount motor fit.cant seem to insert pics sorry,email me if you want to see,thanks
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Post by buzzbug on Jan 6, 2014 17:45:47 GMT -5
Correct,it wont bolt onto original 50cc mount,but it would be way easier to make a bottom mount than hang it from the top,[at least that was the case for me].
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Post by buzzbug on Jan 3, 2014 3:12:02 GMT -5
Kazuma quadbikes have a bottom mount on their GY6 150 motors,i have one in one of our Gokarts,uses all common Gy6 parts ,variator,cam etc except cyl and head bolt spacing is slightly different
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Post by buzzbug on Nov 23, 2013 14:43:43 GMT -5
Thanks guys,appreciate the info!.im also having trouble finding top end gasket sets for my "B" case motor...any ideas?
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Post by buzzbug on Nov 22, 2013 20:50:37 GMT -5
Im building a race GY6-150 motor for my daughters Gokart [see other post],So far I've got the following parts,NCY63mm BBK,6mm stroker crank,A9 cam with adjustable cam gear,NCY variator kit and Im using the 30mm pumper round slide carb off the current motor.
im having trouble deciding if i should use a 4 valve head or go for big 2 valve?,it seems there is little info on the 4 valve heads and Im worried maybe thats for a good reason ??.Also havent found anyone selling cams for the 4 valve head?
Also wondered if stock oil pump and starter clutch are up to the job or ??
Appreciate any help[from those that know],thanks
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Post by buzzbug on Nov 11, 2013 4:31:10 GMT -5
Thanks guys,good ideas to think over,I was finding little in the way of performance parts for the "B" case,so prob will go the 157 route ,although most crank/piston kits seem to make the motor close to square [bore/stroke],isnt the optimum ratio approx 60% bore to 40% stroke?I'd thought maybe just a 66mm piston kit on the "B" case motor would be heading in the right direction,or do we need the torque of a longer stroke to optimise the CVT ?
.Has anyone used one of the inner rotor flywheel kits ...good or bad ?,i dont need much in the way of charging.
Also seems not many are using the 4 valve heads,any reason ?,4 valves seem to work better on motorcycle and car engines.
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Post by buzzbug on Nov 10, 2013 16:14:32 GMT -5
Hi,Im new to the forum ,but I've been messing about with the gy6 motors for a couple of years now.
We use them in racing grasskarts,the CVT trans is perfect for it and have found them very reliable.
1 kart has a GY6 with 58.5 NCY kit,NCY cam,ignition ,30mm Keihin pumper [slide, not CV carb],custom supertrapp exhaust and Koso variator kit,it goes great,but lacks top end.
2nd Kart has a factory GY6-180 163Qmi,with NCY ignition,NCY variator kit and 30mm Keihin pumper,its a bit of a slug compared to the 160,but I think its due to std cam ? [NCY cam wont fit 180 head]
Problem is the rules have changed to allow up to 200cc engines now,so we need more power.
So I need to build up a hot GY6 under 200cc,I have a few parts ie 4 valve head,NCY inner rotor kit,Oko 32mm flat slide,but not sure if I should use the 150 or the 180 as a base [4 valve wont fit 180].
Is the 180 a "B" case ? ,also why do some parts sellers say the bbks wont fit ona 1P57QMI,I've compared them for cyl spacing etc and they seem the same.
a lot of questions,sorry but i live in New Zealand,not much knowledge here about GY6's
Heres a video of my Daughters kart [skip first min] enjoy lol
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