Honda Chaly CF70

[Dino1985]

Hi All

I have a few questions about my Honda Chaly - Its a 1978 6V - I have owned the bike for around 2 years. Its mostly stock and has been a dream to ride. However over the last 2 months it developed a back fire on deceleration.

I completed the following
- Carb cleaned (by me). Then cleaned a second time by a mechanic that had an ultra sonic cleaner
- Changed the airlifter
- Replaced the seal going into the head
- Checked exhaust for holes and found x2 tiny pin holes that i repaired and then i cleaned the exhaust

Result? - Still backfiring

The plug looks like its running rich but the carb seems tuned. 2 turns out! It can be difficult to start but i new plug starts it easy first time.

I then saw a very interesting video on YouTube of a trail90 in America that had almost exactly the same issue and the guy recommended changing the condenser. I thought what have i got to loose its a £12 part. My mechanic booked me and should have been a 1 hour job.

The issue - He went to take the flywheel off to access the condenser and the bolt had threaded. He had to tap and dye the thread to get the remover on but the crank seems to have been hit with a hammer at some point and the flywheel doesn't want to come off. The flywheel is good and stuck which means he cant access the condensor to replace it

Questions i have are

- Any suggestions on how to get the flywheel off?
- If i cant get it off what are my options? Would an ST70 6V engine fit my bike if i have no choice?
- Any other suggestions on the backfire? Can i get away with not pulling the flywheel off at the moment and try something else to get rid of the backfire

Im going to have to deal with the flywheel issue at some point but even if i can get the backfire to stop that would be a bonus. I only pleasure ride the bike in the summer so only do around 300 miles a year.

Any help would be appreciated.

 

[power6994]

Check your valve clearances as a start. Lots of yt videos on how to do this

 

[OLD CT]

Not a very good mechanic if they can't get the flywheel off. There are different types of pullers. The flywheel HAS TO come off. Points and condenser need changing. Order a better flywheel in the meantime.

 

[Tripod]

Show us some pictures of the chaly. Would be helpful to know which generation you have.

This is the flywheel I have on mine. It's a denso and not the usual Hitachi and Mitsubishi found on ct70s.

 

[skylarker]

Move the retaining clip on the main jet needle up one knock.
Check pilot air screw setting.

 

[fatcaaat]

Five wheel puller are like US$15. Unless the motor has been submerged in water for a few months, I’ve never seen a puller failed to remove one. I did once receive a core TRX 90 motor and the flywheel would not come off even with a puller, heat, kroil. I cut it off since it looked like the crank was also shot anyway.. your motor looks good. Get yourself a puller.