Easier to just replace it.
Honda CT70 Hitachi Flywheel CT70 Mini Trail Stock | eBay
Honda CT70 Hitachi Flywheel CT70 Mini Trail Stock | eBay
Looks like a 77 is the same as 78 and 79 years.
31110-098-782 FLYWHEEL
31110-098-782 FLYWHEEL
Two different companies built flywheels and stators for Honda ct70 engines. Yours must be the other company.
Try:
Www.dratv.com
Rick
Two CT90 and two ST90 bikes
Try:
Www.dratv.com
Rick
Two CT90 and two ST90 bikes
The tapered crankshaft end where the flywheel bolts on is fairly malleable (easy to bend). Are you sure its the flywheel, and not the crankshaft, that is bent?
How I know this: during the building of several different Honda stator testers, several crankshaft ends were liberated and machined to fit shafting that can be spun with an electric motor drive. All the CT90, S90, C70, CT70, SL70, and other small single and twin Honda motorcycle crankshafts are easily bent and machined.
Side note: straightened two freebie, bent cranks by placing shims under the flywheel on the low side, torquing the flywheel down to bend the crankshaft, and by over-correcting a little bit, when the pressure was eased off I got a nice straight crankshaft. These repaired cranks were NOT run in an engine again, I cut the flywheel end off and used the tapers (and flywheels) to build stator testers.
Neither have failed, and both have seen 10,000 RPM for a time.
Side note 2: I have never seen anyone bend a Honda flywheel, not saying it cannot be done, no Sir, just that the crank seems much easier to ruin and it is worth at least checking.
Jon
How I know this: during the building of several different Honda stator testers, several crankshaft ends were liberated and machined to fit shafting that can be spun with an electric motor drive. All the CT90, S90, C70, CT70, SL70, and other small single and twin Honda motorcycle crankshafts are easily bent and machined.
Side note: straightened two freebie, bent cranks by placing shims under the flywheel on the low side, torquing the flywheel down to bend the crankshaft, and by over-correcting a little bit, when the pressure was eased off I got a nice straight crankshaft. These repaired cranks were NOT run in an engine again, I cut the flywheel end off and used the tapers (and flywheels) to build stator testers.
Neither have failed, and both have seen 10,000 RPM for a time.
Side note 2: I have never seen anyone bend a Honda flywheel, not saying it cannot be done, no Sir, just that the crank seems much easier to ruin and it is worth at least checking.
Jon
It's hard to tell which one is bent. It looks like the flywheel is bent but its hard to tell by eye. By kicking the motor over, the crank does look straight but its hard to keep the bike from moving to see if theres a bit of a wobble. I just don't know whether to buy a used flywheel or a crank to test which one it is.