collapse

www.dimecitycycles.com


www.restocycle.com

www.CITYLIMITMOTO.com

www.jadusmotorcycleparts.com

www.bisonmotorsports.com

www.speedmotoco.com

www.lostapostlejewelry.com

www.cognitomoto.com

www.townmoto.com

www.sparckmoto.com

www.Moto-Madness.com

www.pistonsociety.com

www.steeltowngarage.com


Author Topic: Honda CB450 K5 Cafe Racer.. ish  (Read 8552 times)

Offline bezugo

  • Posts: 53
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #10 on: Jun 24, 2016, 05:56:17 »
What would cause the engine to rev higher on it's own while idling?

It usually just doesn't idle at all or idles in very low rpms. If i rotate the throttle it revs nicely and sometimes maintains a high engine speed.
It's not the cables. I've checked.

The choke lever doesn't seem to be doing a lot of anything either.
When it revs higher I usually use the choke (open it) and the reaction is slow.

Offline Green199

  • DTT BOTM WINNER
  • *
  • Posts: 989
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #11 on: Jun 24, 2016, 06:08:26 »
Nice bike to start with.

The idle rising could be a vacuum leak, caused between air entering the system between the carbs and inlet rubbers, or between the inlet rubbers and the head.

With the bike running, spray some WD-40 around it and see if the idle rises. If it does, you have a leak.
1973 CB250 'Doing it right this time round' - http://www.dotheton.com/forum/index.php?topic=36795.0

Offline bezugo

  • Posts: 53
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #12 on: Jun 24, 2016, 07:36:35 »
Thanks
I'll check into that.  Could it be from the carbs themselves?

Also, just last night I finished installing new front pads.
Is it just me or that support/bracket that tilts side to side is just poorly engineered?
It doesn't allow the pads to make full contact with the disk

Offline bezugo

  • Posts: 53
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #13 on: Jul 01, 2016, 20:59:34 »
So... i've rebuilt the carbs again and this time noticed that the spring float valve on the right carb was stuck in open position.
I got it unstuck, cleaned and made sure nothing was clogged, and reassembled both carbs.
This time i used silicone sealant to make sure no air was going in.

I noticed one of the floats had some liquid inside. Not a lot and it did not come out no matter what i did with it.

After putting the carbs back on the bike it started easily. This time i was able to keep it idling at a normal speed.

Took it for a ride and after about 2k or 3k revs it starts misfiring and almost doesn't rev any higher independent of how much throttle i appy.
Even before the ride it was leaking fuel continuously from the right drain.  That only stops when i close the petcock.

What could it be this time?  Is it the float adjustment?  Do i absolutely need rebuild kits for the carbs?

Offline bezugo

  • Posts: 53
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #14 on: Jul 18, 2016, 08:33:18 »
Ok.. I adjusted the floats on both carbs and now they don't leak.

It still doesn't rev any higher.

I'm going for a valve adjustment and new points.
Wish me luck

Offline bezugo

  • Posts: 53
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #15 on: Jul 18, 2016, 08:35:19 »
This is where I'm at

Offline WackoTie

  • Posts: 22
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #16 on: Jul 18, 2016, 10:44:09 »
Does it not rev any higher or does it bog? If it bogs, and you're at about half throttle you may need to adjust your needle height or you're main jet

Sent from my SM-G920P using DO THE TON mobile app


Offline bezugo

  • Posts: 53
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #17 on: Jul 18, 2016, 18:12:58 »
It bogs.  I can make it rev higher if I really give it time to develop.
In neutral it seems like there's nothing wrong. It revs nicely but I never pushed it to redline yet.  She's taking her first steps. Don't wanna break anything by reving it like crazy

Offline WackoTie

  • Posts: 22
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #18 on: Jul 19, 2016, 02:50:28 »
Yea fine tuning the carbs is supposed to be done under load so that's probably why you weren't experiencing anything in neutral. Does it have pods or an aftermarket exhaust?

Sent from my SM-G920P using DO THE TON mobile app


Offline djmaynard

  • Posts: 207
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #19 on: Jul 19, 2016, 11:15:01 »
Does look good, best of luck with the carbs.