Anyone ever see a BBK for an Aero NH80?

[Ewestfall]

Thanks.... Glad to hear you got it fixed....

[yamahauler660r]

No actual kit, but you can always use a CR80 piston.


"A European catalog for Wiseco pistons (an after market supplier) listed their 1984 Honda CR80R piston as being suitable for a "Lead 80" scooter. My Aero has almost a 1 inch wide boost port; substantially more than the total .820 inch spacing on the 1984 CR80 piston. The earlier CR80 (1983 model # 493) Wiseco piston has almost an inch between the pins so its the one I eventually installed. They come in sizes from 49.5 mm to 51.5 mm and wise co pistons should be available through your local motorcycle dealer. After buying the piston I visited my local machine shop who bored the cylinder to match the piston.
The Wiseco CR80 piston is in the scooter and it works great! I had to buy a CR80 wrist pin as well because the Aero 80 wrist pin was too long and wouldn't allow me to fit the pin locating circlips into the piston. I had removed about 1/16 inch or about 2 mm off the stock head and so the compression is higher. Cylinder pressure is 160 psi. The engine really wants to rev and I've re-installed the stock weights. I haven't been driving it anywhere that I could open it up yet but 70 km/h is easily obtainable even on mild hills. Acceleration is better than before but still not as good as I'd want. The engine revs and then the variable pulley kicks up and the engine bogs down until it increases speed again. Just another reminder that increasing engine power is only one part of the equation for increased speed and acceleration."

I know this thread is over 2 years old, but I'm working on 2 83 aero 80's one needs a complete rebuild and one runs so I'm just doing new rings. OEM rings look to be available. is the cr80 piston my best bet for the complete rebuild? (I never trust the ebay kits) there is a local shop that can bore the cylinder. I already have the cr80 wrist pin. for my 83 I should get weisco piston #493? and the piston wont need to be modified?

[patthesoundguy]

Thats a good plan not to trust the eBay kit for the aero 80. The spree kit from that supplier was out of spec. I have the eBay kit for my aero 80 if I do use it I'll be getting it bored to fit the 1st oversize piston or that wiesco piston.