Dserna said:
DAMIEN1307 you said the reed would help with low end?
ONLY IF you have the 80/66cc type motor, then these are the things you would need in order to not only fix your motor with a new jug etc. but to also modify it to use a reed valve...I am also assuming that your head is not damaged and hence reusable if you also get a new head gasket since I did not see a picture from you showing the underside of the head.
Be sure that you also have the appropriate bottom of the jug gaskets as well, I am not a believer in re-using old gaskets.
You will need a windowed piston for this to work for a reed valve.
If your present piston has these measurements as close as you can measure it, this one should work.
Why this windowed piston doesn't include the bearing as well is anyones guess why not...lol.
47mm diameter
45mm height
Type B high wrist pin
2 Stroke 80cc High Pin Dual Windowed Piston Kit
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If your motor setup is an 80/66cc motor, you would also need this needle bearing for the piston rod that goes over the wrist pin when assembling the piston to the piston rod...
Needle Bearing for Connecting Rod (Part # 29)
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And IF you have an 80/66cc motor setup, this jug below already has the reed valve I use with my BoFeng carburetor...The stock NT carburetors will work with this reed valve as well.
80cc High Performance RSE Reed Valve Racing Cylinder For Bicycle Engines - Motorized Bike Jug
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NOTE:
If some of our well known members could chime in and tell us all if the bottom end on a 49cc motor is the same as the 88/66cc motor, then these recommendations should work as well...I just dont know the ins and outs of the 49cc motors to know if there is a difference in stroke which i believe is 38 versus the 40 that the larger motors are, and if there is a difference in low or high wrist pin position...Best to wait for one of them to chime in before ordering anything that might not work with your setup.
It would also be a good thing to know if your intake and exhaust ports measure either 38mm or 40mm by measuring from the center of one stud to the center of the other stud...This would also give us an insight into what motor you might have as well.