81 engine takes forever to warm up and run smooth?
-
- Posts: 13
- Joined: Thu Dec 17, 2015 7:29 pm
81 engine takes forever to warm up and run smooth?
New to older bikes. Can anyone lead me in what direction they would go to try to resolve the long warm up time of my engine. When I try to run the bike I have to choke it for about 4-5 minutes until it will run without the choke. Is it, air cleaners, carbeurators need work?
Re: 81 engine takes forever to warm up and run smooth?
Welcome here! What kind of air cleaner system do you have? The 81 models had CV carbs, and if you are trying to run pods on them, you may have difficulty getting it to run right. The CV carbs run best with the stock air box.
Have a problem with your CB650? Have a technical question? Click here!
My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,
My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,
-
- Posts: 13
- Joined: Thu Dec 17, 2015 7:29 pm
Re: 81 engine takes forever to warm up and run smooth?
I believe it is the stock air box.
Re: 81 engine takes forever to warm up and run smooth?
You may have an air leak or two around your insulators. Start the bike and let it warm up until it is idling as best it can. Then spray carb cleaner around the insulators that go from each carb to the cylinder head. Any change in idle indicates a leak.
What is the history of this bike?
What is the history of this bike?
Have a problem with your CB650? Have a technical question? Click here!
My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,
My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,
-
- Posts: 13
- Joined: Thu Dec 17, 2015 7:29 pm
Re: 81 engine takes forever to warm up and run smooth?
Thank you, i'll check that.
-
- Posts: 36
- Joined: Sat Sep 12, 2015 1:43 pm
- Location: Gaithersburg, Maryland
- Contact:
Re: 81 engine takes forever to warm up and run smooth?
Partially clogged idle circuit (pilot/low speed) jets could cause this as well. I have the mechanical carbs and you have the CV, so YMMV, but the stock jetting is pretty lean to start with. Of the several bikes that I have owned, this CB650 seems to take the longest to get warm.
Tim
Current:1980 Honda CB650C Custom, 1969 Toyota Corona Deluxe Sedan
Past: '07 Honda Rebel 250, '80 Yamaha XS1100 Special, '69 Honda CB160, '67 K15 Suzuki Hillbilly
Current:1980 Honda CB650C Custom, 1969 Toyota Corona Deluxe Sedan
Past: '07 Honda Rebel 250, '80 Yamaha XS1100 Special, '69 Honda CB160, '67 K15 Suzuki Hillbilly
Return to “Technical Discussion”
Who is online
Users browsing this forum: No registered users and 34 guests