Replacement of slow-speed jets on a 1981 CB650

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ballinchestr
Posts: 3
Joined: Thu Aug 02, 2018 9:21 pm

Replacement of slow-speed jets on a 1981 CB650

Postby ballinchestr » Thu Jan 24, 2019 5:12 pm

My bike had a very hard time idling last time I rode it, so while it's cold and snowy out, I figured I'd assess the issue. The problem was that all four slow speed jets were completely blocked. I decided to remove them for cleaning or replacement. These are the pressed in kind that are a huge pain to remove. I did this by drilling and tapping the opening before the orifice to #4-40, and tightening a #4-40 machine screw and bolt onto it until the jet popped out. I did this for all four jets, and they all came out nicely.

The problem now is that I want to replace the jets, but I can't find them anywhere online. I can find some pressed in jets for a similar model but I'm not sure if it will fit. What are the thread specs on the '82 jets? I might just tap the holes and put in threaded jets. Has anyone here had experience with this?

Simon_CB650
Posts: 1
Joined: Tue Mar 05, 2019 10:38 am

Re: Replacement of slow-speed jets on a 1981 CB650

Postby Simon_CB650 » Tue Mar 05, 2019 10:42 am

If you're still looking for slow jet.

https://thecarburetorpartsstore.ecwid.c ... -p40162426



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ballinchestr
Posts: 3
Joined: Thu Aug 02, 2018 9:21 pm

Re: Replacement of slow-speed jets on a 1981 CB650

Postby ballinchestr » Mon Mar 11, 2019 3:14 pm

Simon_CB650 wrote:If you're still looking for slow jet.

https://thecarburetorpartsstore.ecwid.c ... -p40162426


Yes, I am still on the hunt. That actually looks like it will work, I guess I wasn't looking hard enough. If these fit, wont #38 be too rich though? My current jets are #35. I do plan on eventually installing a higher flow 4-1 exhaust, but I fear #38 will still be too rich...


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