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1985 aero 50 big bore kit not cranking
Posted: Mon Mar 20, 2023 4:37 pm
by Aero50owner
Hi everyone,
A few weeks ago i decided to upgrade my aero a little bit by installing a malossi big bore kit, exhaust, and gears and now i cant get it to start. It seems like the starter doesnt have enough power to turn the motor over. If i take the spark plug out, it turns over just fine, so i dont think anything is siezed. Since its a bigger piston, is the starter just not strong enough? Or is something else wrong? I put a new solenoid and battery in too but that didnt seem to help. If anyone has any answers, please let me know thanks
Re: 1985 aero 50 big bore kit not cranking
Posted: Tue Mar 21, 2023 11:21 pm
by bonesv
Your starter is designed for 50 cc's and it's prob the orig? so.....Maybe try kick starting it? Make sure you let it idle up to temp a few times before you go out riding it. Check compression to be sure it's not over 135 psi or you would need hi-octane fuel or another head gasket. Is it stock carb?
Jetting can be tricky on stock carb setup. Air box or pod filter?
Re: 1985 aero 50 big bore kit not cranking
Posted: Wed Mar 22, 2023 12:07 pm
by Wheelman-111
Greetings:
No kickstarter on a stock 1985. You can install the '86-'87 cover and the outer sheave with the castle nubs if the parts can be found. Tough nowadays.
If you have a multi-tester, see that the battery has at least 12.8 volts or more. Charge it if you can, but these batteries won't take a charge after 3-4 years in my experience. Yes the bigger cylinder does require a little more Oomph to turn over, but usually a fully-charged battery is enough. You could always try to get that extra Oomph by jumping from a car battery just to see if it starts OK.
See above for other good advice. Bones is ... um, Are wise.
Re: 1985 aero 50 big bore kit not cranking
Posted: Wed Mar 22, 2023 6:24 pm
by Aero50owner
bonesv wrote: ↑Tue Mar 21, 2023 11:21 pm
Your starter is designed for 50 cc's and it's prob the orig? so.....Maybe try kick starting it? Make sure you let it idle up to temp a few times before you go out riding it. Check compression to be sure it's not over 135 psi or you would need hi-octane fuel or another head gasket. Is it stock carb?
Jetting can be tricky on stock carb setup. Air box or pod filter?
Ok, i dont have a kick starter on my aero since its an 85, and it is another starter i had bought to replace the old one that was on it. Ill try to comp test it when i get a tester. Im running the stock carb with a re jet. I have a 95 in it right now, but i can go down as i have a whole kit of jets. Im running the stock airbox too.
Re: 1985 aero 50 big bore kit not cranking
Posted: Wed Mar 22, 2023 6:28 pm
by Aero50owner
Wheelman-111 wrote: ↑Wed Mar 22, 2023 12:07 pm
Greetings:
No kickstarter on a stock 1985. You can install the '86-'87 cover and the outer sheave with the castle nubs if the parts can be found. Tough nowadays.
If you have a multi-tester, see that the battery has at least 12.8 volts or more. Charge it if you can, but these batteries won't take a charge after 3-4 years in my experience. Yes the bigger cylinder does require a little more Oomph to turn over, but usually a fully-charged battery is enough. You could always try to get that extra Oomph by jumping from a car battery just to see if it starts OK.
See above for other good advice. Bones is ... um, Are wise.
So the cover just bolts up? Thats pretty awesome!
I tested the battery and it reads about 13v so i dont think the battery is too weak. Maybe ill use a car battery to jump it and see. Would the electric starter be able tp start it even if it is a frest start? Like never been started after the install?
Re: 1985 aero 50 big bore kit not cranking
Posted: Tue Apr 04, 2023 8:51 pm
by Wheelman-111
Greetings:
Yes, Honda started all their new 1985s right after assembly.
How hard is it to spin at the front pulley? No binding or catching?
Any reason to suspect too much oil on top of the piston - enthusiastic over-use of assembly lube?