Honda Spree and Elite 50 Forums

jwhite2 wrote:The shop manual says the Aero 125 standard bore and stroke are 55x52.4mm. Do I just get the 55.50 piston for the CR125 and bore out to 55.5. Yes

The listed stroke for these pistons is 50mm. Does that affect anything? NO

Which of the 4 or 5 that pop up would I want? The on closest to the stock bore and the closest year.

What else besides boring out the cylinder would I need to do to make this work? Any other machining work? Make sure the ports get chamfered after boring and honing.

Thanks. This is a world of great wealth that I don't have access to through my hometown. I took my Aero 125 up to our Honda dealer for an inspection to see if they could fix it and the guy gave me all this junk about age and parts, etc. I WILL get this bike running. Honda does not support vehicles this old, even though some parts are sill available.

-J

jwhite2 wrote:Does this require a new cylinder head for the new piston size? If so, where would I get one?

Thanks,
-J

jwhite2 wrote:So the head needs to come with me then. I take it any machine shop that works on powersports will know to do the head as well.

Anyone know where to get gaskets for all this stuff?

Thanks

-J

jwhite2 wrote:Will the piston you linked work? It says something about a Suzuki. Thanks again by the way for all this help. It really is appreciated so much! Yes, it will work as the Suzuki piston is the same as the Aero 125 piston (X 2 = 250)

If I am getting the cylinder head bored as well, would it hurt to go with an ebay used head? A new one is $75. I hesitate not to go ahead and spend that money since it is one of the few parts I can purchase new. But money is always tight so any I can save is good. If your head is dinged up then get a used head. You do not bore the head, you just have the guy make sure it is flat so it seals properly.

So whats my next step after bore and hone? Will the newly bored cylinder, piston, and head all just bolt right on and work? Anything else I should be thinking about/ ordering? Make sure the ports get chamfered. Use lots of 2 stroke oil on the piston pin, the rings, the piston walls and the cylinder walls. Bolt it up but use a torque wrench and at least 3 steps to torque the bolts.

I am in the market for a carb for this thing. The one that came on it was not the stock one. A previous owner welded together some odd adapter to make the carb work. It ran at one point so I may just see how it works before I replace it.
First off it sound like this carb blew your motor up. I have no more spare carbs for the 125 at this point. I do have adapters to install the CT intake with which you can use everything from a 21 mm to a 28 mm OKO carb.
Thanks

-J