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Author Topic: Honda CB450 K5 Cafe Racer.. ish  (Read 8548 times)

Offline advCo

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Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #20 on: Jul 19, 2016, 11:32:53 »
Are those EMGO pods? If so, throw them in the trash, or do some searching for the technique to mod them so they don't restrict airflow.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline teazer

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Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #21 on: Jul 19, 2016, 12:02:48 »
Floats with fuel in them must be replaced.  I would also fit new OEM air filter and throw away the pods.  Those carbs do not work well with pods - even "good ones". 

Float height is a bit tricky to set.  99% of the pictures show the carb upside down, but that is not how to do it.  The carb has to be tilted so that the float just starts to rest on the needle.
https://www.fix.com/blog/motorcycle-carburetor-float-height-adjustment/

 A better way is to set FUEL level which should be 2-4mm below the gasket surface.
http://xjbikes.com/forums/threads/wet-set-can-somebody-check-my-work.44934/
http://69.46.28.106/forum/3-carburetor/503227-wet-float-level-for-900 


Offline Flugtechnik

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Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #22 on: Jul 19, 2016, 13:43:36 »
I made a float height tool like this from an old card to adjust the heights on the bike.



Turn off gas
Remove bowl
Hold float at proper height with tool (at lowest point on float)
Turn on gas
Adjust float tab so that gas just starts to leak out if you lower the float even slightly (you will have to turn the gas on and off to do this)

It is a little messy so be prepared for cleanup, and keep a fire extinguisher handy.

As Teazer said, if there is any fluid in the float, they won't work correctly.  There must also be a crack somewhere and more will get in.


As for air filters, if you don't have the stock airbox, you can try these UNI filters.  My bike has been running OK with them.

http://4into1.com/uni-foam-air-filter-pod-set-cb350-cb450-cb500/



end of line

Offline bezugo

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Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #23 on: Jul 22, 2016, 16:29:50 »
It as pods and aftermarket mufflers.
20 years ago (when it worked fine) it had no air filters. Only two horn shaped tubes with a wire mesh, so maybe these pods are restricting air flow.
After I do the valve adjustment and the new points I'll try on those "horns" and see if it runs better.

I'm probably going to order two carb rebuild kits with floats as I'm sure that float that's leaking must have some kind of influence.

For now I'm sure the valve adjustment and points are the most important thing.
I'm pretty sure one cylinder is misfiring.

I've got a video but I'm not sure it's noticeable

Offline bezugo

  • Posts: 53
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #24 on: Aug 14, 2016, 12:54:02 »
Yesterday i did the valve adjustment and replaced points.
Also fitted all new internals to the carbs.  New throttle cable and clutch cable.

The valves had way too much gap. Adjusted the best i could and it really does less valvetrain noise.

Checked the timing advancer and it looks perfectly functional. Decided not to remove it.
Fitted new points and they were a bitch to adjust... but only because i'm a dumbass and didn't (initially) do it like the tutorial.

This one.  <iframe width="560" height="315" src="https://www.youtube.com/embed/nDvghJiJGFc" frameborder="0" allowfullscreen></iframe>

When did it on the compression stroke it worked.  They are pretty much bang on.

The carbs were rebuilt with mostly all new internals and then adjusted the float using Flugtechnik's tool.

The new cables also made a difference.  Clutch travel is much smoother and hopefully the throttle is more even in both carbs now.



So i took it for it's first ride

First drive around the block and it spewed oil from the exhaust on to the engine and my legs.  Tightened both exhausts (which were not properly tightened) and it practically stopped.

Should there even be any oil going to the exhaust?

A continuous flow of smoke comes out of the valve cover breather tube..

Sometimes it idles at 1200rpm or a bit higher, but other times it idles at 3200rpm.  What can it be?  Air going in?

At first i rode it without filters and then put those cheap air filters.  No difference.  Also the choke only stalls the engine.  Never runs with it closed.

While running it revs nicely (but not perfectly) until 6/7000 rpm.  Doesn't pass that.


But not all are bad news..  After many pitstops at my garage i finally took it for a long drive.  Rode it for around 15 miles and it didn't leave me stranded.

Overall i'm happy

Offline bezugo

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Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #25 on: Aug 14, 2016, 14:19:14 »
This is the carb rebuild kit i got, but i didn't use any of those two O-rings because i couldn't find where they go.

What am i missing?


Offline bezugo

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Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #26 on: Aug 14, 2016, 14:21:46 »
And this is a video made before these latest updates.  It ran, but didn't rev higher than 3/4000 rpm


« Last Edit: Aug 14, 2016, 14:37:03 by bezugo »

Offline advCo

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Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #27 on: Aug 14, 2016, 16:52:52 »
There should be no oil to the exhaust. If so you may have worn rings. Check compression and if it's low add a tbsp of oil in the plug hole and check again. If it increased significantly your rings are worn.

High/inconsistent idle will most likely be caused by out of sync carbs or a vacuum leak allowing more air in. You can spray wd40 around the carb boots on carb and engine side while bike is running, if RPMs surge you have a vacuum leak.

If you have white "smoke" coming out of the breather that is normal, it's actually water vapor "boiling" out of the oil, and is normal. Usually it's not noticed because the breather is rerouted to the stock airbox.


Sent from my iPhone using DO THE TON
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline bezugo

  • Posts: 53
Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #28 on: Aug 14, 2016, 17:34:04 »
Thanks!

What may be the consequences of worn rings?  From what I remember it's not a big deal. Just loss of power and oil consumption.
Am I right?  These engines are new to me.

What about those O-rings?  Where are they supposed to go?  That may be my leak..

Offline advCo

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Re: Honda CB450 K5 Cafe Racer.. ish
« Reply #29 on: Aug 14, 2016, 17:50:49 »

Thanks!

What may be the consequences of worn rings?  From what I remember it's not a big deal. Just loss of power and oil consumption.
Am I right?  These engines are new to me.

What about those O-rings?  Where are they supposed to go?  That may be my leak..

The small o-rings look like they go on the air/fuel mixture screws. Check the Honda parts fiche for your model for the order of spring/gasket on the mixture screw - you can go to any Honda dealers site and look up your model in the OEM parts finder. I use my old local dealer Bettencourts.com

It depends on how worn your rings are, but that's what they cause. The more out of spec they are the more noticeable the effects will be. Checking compression will help narrow it down.


Sent from my iPhone using DO THE TON
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0