Sometimes I get PO'ed, sometimes I lose direction, sometimes I just need a change for a day or so.
This all started about 3 months back.....or so... Some guy had a whole bunch of 139QMB cylinder heads for sale on Ebay.....about 20 bux each. At a price that low, I figurred they had ro be QA rejects! But sometimes even a reject can serve a purpose. I bought one.
Today, I started taking it apart..... no, I mean APART! As soon as I just started looking at the head, I saw a problem with the exhaust seat..... such as light, beteween the seat and the valve, at least 1/3rd it's circumference, and about .060" wide. Had this head been installed as is, it never would have started.
So all the valve gear, including the guides, went into the parts box. All that stuff looked OK.
No to REALLY take it appart....whre's my bandsaw.
O man...what's with all those machinist set-up punches? Well sometimes you need to satrt some holes, directly in the center of an existing "pattern's" holes. Then you can sart making a fly cutter, similar to the one in the upper left of this photo...
Or, another veiw, like in this case...
Then when finished, the engine builder will have his store bought 60-65.5mm 157qmj BBK fly cutter, AND a homemeade baby brother for 139qmb 80-95cc BBK's
Anyway, I needed a little diversion today...this back is killing me, setting up appts is a PIA....yadayadayada should be done in a day or so, then back to Max.
Great job Kliff, you are a heck off a machinist thats for sure. I have seen some of your other work too. Take care of that back, my dad has a bad back and over does it all the time then ends up in bed for 2 or 3 days.
01 CPI Miskito- Drag scoot 01 Aprilia DiTech- Parting out 03 Kymco Cobra R - Daily driver
Whoooooeeee, not much done this week on nuttin'! But this piece started off as a 4" dia X 5" long piece of steel.....since Monday it has sorta changed shape. Even had dad out there doing some turning for a couple of hours during the week.... slow but sure, metal removal like this, in steel just takes time...
A couple more hours here, then the arbor/ cutter holder, and it'll be done!
Getting there....slowly but surely. The store bought housing(150) is on the left, The homemade housing, (50), is on the right.... so far a 57mm piston is looking "doable" for a 50cc, if the crank bearing can be improved upon. But it would be a limitted life, race engine....don't even think street applications....to much crank and case stress, along with known bearing over loading, and heat is another factor that will show it's ugly head here.
But an Alky drag motor.....weeellllllll, now, that's a horse of a different color. How big would that be, 58mm by what, times who, when....huh.../
hmmm the class would be 100c and under for the QMB, maybe we need a unlimited class for Kliff.
Oh I dunno.....what fun would racing yourself be? Maybe a transerance of some technology and machine work, for a few parts exchanges.... I could see where a mid-west meets south event, next summer could be fun, between a pair of alky burning "Big Bore Small Block QMB's"
So are you going to use top ends off a 150 to make these mighty mouses? Or is there any chance of the studs lining up, or would you just relocate them.
So are you going to use top ends off a 150 to make these mighty mouses? Or is there any chance of the studs lining up, or would you just relocate them.
Nah....too easy. I'll bore out the stock cylinder to receive the largest sleeve I can press in, then bore out the case, get a final measurement on the smalles part of the new sleeve, which will be the tails, figure on a 1.5-2mm wall thickness, and size the piston form there. 58mm looks doable, though due to piston availability, we may settle on a 56, 57.25....it'll be interesting. Probably gonna need to make a head and case girdle to keep the top enf connected to the crankcase.... small alky motors tend to load up on liquid fuel during decel, sometime kicking compression to 20+:1 with liquid in the cylinder. Bad things can happen in the blink of an eye, if the top isn't reinforces..... or we could build for 104 Octane race gas, and for go the girdle....
jeeze kliff i thought i had skillz , and im an arrogant jerk , but man you got me topped by so much i wanna be adopted by you ,.......... can i be your anakin and you be my palpitine show me the darkside of the force man come on'
gy6forlife: I am jason from Noblesville out in the corn fields and I am having a hell of a time getting my VIP 2007 W/A BBK TO PULL RPMS WITH ME ON IT,IT RAN LIKE A TOP FOR OVER 3 YEARS AND 12k MILE B 4 THE ISSUES STARTED AT THE CAR WASH,NOW THAT I HAVE IT BACK UP AND
Feb 16, 2013 16:33:12 GMT -5
gy6forlife: TRANSPROTATION FOR ME TO GET TO WORK AND MAKE MONEY?i HAVE ALL THE AFTERMARKET STUFF ON THE SHELF TO INSTALL BUT NOT TILL i GET THE WEAK PERFORMANCE OUT OF IT?PLEASE HELP MAN,THANKS FOR ANY INPUT YOU HAVE,AS YOU SEEM TO KNOW A TON ABOUT THESE ENGINES AND V
Feb 16, 2013 16:55:25 GMT -5
gy6forlife: VARIATORS AND SLIDERS AS I HAVE THEM ALL READY TO INSTALL BUT DONT WANT TO TILL IT IS RUNNING WELL AGAIN?I AM NEW TO THIS ,I TOOK IT TO THE CAR WASH,BIG MISTAKE,AND BURT UP STATOR,NOW RUNNING AGAIN,AND W/BBK 80CC VERSION FROM SCRAPPY?IT STARTS AND RUNS GRE
Feb 16, 2013 16:57:34 GMT -5
gy6forlife: GREAT ON STAND,ON THE WHEELS IT WONT GO PAST 20MPH?i TRIED THE #85/#35 JETS IT JUST STUMBLED AT ALL INTERVALS?i NEED THIS TO GET TO WORK MAN,IF YOU HAVE ANY THING TO INPUT,I THANK YOU FOR YOUR INPUT AND TIME,GY6FORLIFE,JASON
Feb 16, 2013 16:59:33 GMT -5
gy6forlife: IT NOW HAS THE STOCK JETS AND IT RUNS GOOD ON THE KICK STAND AND UNTILL I TRY TO RIDE IT ,IT IS A TOTAL DOG SHIET MAN,i DONT KNOW WHAT ELSE TO DO MAN?PLEASE HELPME?YU ARE A PRO AND MAY KNOW HNOW TO FIX IT?
Feb 16, 2013 17:01:27 GMT -5
gy6forlife: I HAVE SET A SIDE A koso PERFORMANCE VARIARTOR AND REAR LARGE/AND 3 SMALLER SPRINGS TO INSTALL ONCE i GET IT RUNNING CORRECTLY,BUT i PUT IT BACK TO STOCK TO START AT A KNOWN POINT?? EVEN THE CARB AND,i DID DO SOME PORTING TO THE HEAD JUST TO CLEAN UP THE C
Feb 16, 2013 17:06:42 GMT -5
gy6forlife: AS I BOUGHT ALL THE PERFORMANCE ,CDI,COIL,SLIDERS,GATES BELT,REAR 4 YELLOW SPRINGS AND I HAVE PULLED ALL THAT OUT AND PUT BACK TO STOCK,TO START FROM NORMAL CONDITIONS": CAN YOU HELP ME OUT MAN,AS i LOST ME JOB DUE TO NOT BEING ABLE TO GET THERE?ANY INF
Feb 16, 2013 17:12:17 GMT -5
gy6forlife: ANY INFO IS GREATLY APPRECIATED AND NEEDED MAN?THANKS FOR YOUR TIME AND UNDERSTANDING.Jason/GY6FOR LIFE ,ITS ALL BACK TO STOCK BUT THE BBK"SO IF YOU CAN i WILL BE OF GREAT UNDERSTANDING AND APPRECIATE ANY INFO ON WHAT TO DO:?
Feb 16, 2013 17:15:58 GMT -5
pumacyclessteve: the gy6 150 engine needs to have the oil changed more than most other scooters .the simple fact that the metalergy and the alloys are not the highest grade like the high end scooters .the errosoin and general wear down of the internal components.is slowe
Mar 1, 2013 18:51:10 GMT -5
pumacyclessteve: but i have a 150 that i ride hard i mean hard thats 5 years old and still runs like a bad as whith a power pros custom one off exhaust and a big valve head .i will wheelie at most every intersection just out pure confidence in my one trick pony.stay
Mar 1, 2013 19:04:53 GMT -5
Rebel: Yes.
Mar 2, 2013 18:49:26 GMT -5
mukradio: Help! I am working on a 50 cc that I can't get it to idle properly. It's starts off way too high and when it warms up, it dies. It's driving me nuts and it's a short trip! Any ideas? I have disassembled the carb and cleaned it, drained and replaced gas.
Mar 7, 2013 15:41:53 GMT -5
westonpersons: Adjust your valves to .006". There should be easy directions on youtube, otherwise just remove the valve cover and turn the flywheel so the engine is at top dead center, then adjust the 'taps' on the cam holder for the .006" gap.
Mar 8, 2013 15:02:33 GMT -5
mr cool guy dude: hi every body.......bananas
Mar 28, 2013 17:55:49 GMT -5