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Topics - paulbaker1954

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CB500/550 / low float level symptoms
« on: July 10, 2019, 08:11:43 AM »
My bike has been not quite right since last rebuild for head gasket. I think it may be down to float levels but just wondered what the symptoms pf low float levels are.

My issue is pulling away from standstill I have to ramp up the revs or she tries to stall. Hill starts are even more of a challenge requiring me to gun it whilst slipping the clutch. I am confident pilots are clear as they are new and I also checked recently all the pilot air channels but I think float levels on 3 and 4 may be a bit low.

CB500/550 / Nice bike but....
« on: June 14, 2019, 11:08:21 PM »

As I do more and learn more I get more confused with life in the Honda Fours lane  ;D ;D ;D

Having just helicoiled a number of my carb float bowl threads with M4 x 0.7 inserts I got to wondering why these threads were stripping - I have had the float bowls off so many times and wondered if this was why as the carb bodies are pretty soft alloy.

I had earlier replaced the float bowl original M4 screws with M4 capscrews  that I "borrowed from work" without any real intimate knowledge of thread pitches and Japanese variations used on these bikes. So I got to wondering if the capscrews I used were a different pitch to the original JIS screws and maybe that was what was causing the threads to strip.

I am not a purist and prefer to use capscrews where I can as opposed to the original slotted head screws (even though I do have a good set of JIS screwdrivers)

So I started on a Google quest trying to figure out what was what and really didn't get very far.

The parts book is no help as it will simply state size and length (eg M4 x 20)

I do know that on the Hondas often the larger fastenings use the finer pitch but not sure on some of the smaller fastenings

Any gurus out there ever looked at this issue and found any useful data

I did find one post that threw some light on the issue but I am not sure it's a definitive source.

CB500/550 / Float Bowl drain thread size
« on: June 05, 2019, 09:56:46 AM »
Anyone happen to know the spec of the drain screw thread. I want to make up a couple of threaded tubes I can screw in to aid float level measurement.

Basically sick of shoving odd bits of tubing in there that drip fuel all over !!

CB500/550 / Running without main jet retaining spring - opinions
« on: June 02, 2019, 10:47:34 PM »
Just got bike running again after some work but in bye process snapped the main jet retaining spring thing on carb 1.

Jet was a tight push fit with viton o ring, I have ordered a new spring from Gerben but he is on hols till June 7th

Question is do folks think I am ok riding without this spring for a few weeks, i.e is main jet ,likely to pop out?

CB500/550 / Wits end with damn carbs
« on: May 31, 2019, 07:20:02 AM »
Nearly at screaming point now!!!!!!!

Carbs off for overflowing carb, new float valve from DS, new spring from Gerben all cleaned and back together. Bench tested for levels all fine no overflows etc etc. Bench checked at least 3 times.

Then put carbs back on bike and no overflow, started and ran but did notice an intermittent backfire from left hand side (? could an intermittent backfire be caused by an overflowing carb???)

Now the nightmare .....turned fuel, on this morning ready to sync carbs and guess what carb bloody overflowing again!!!!!!!!!!!!!!!!!

I must be missing something obvious here but no idea what. Only thing I haven’t changed is the float valve itself but as I said it seems fine

What the hell am I missing here I am running out of options

CB500/550 / Backfire after rebuild
« on: May 30, 2019, 05:48:21 PM »
Just got the bike running again after new head gasket and some carb work

Getting a backfire about every 30 seconds from 1 cylinder

Not balanced carbs yet but just wondered if anyone had any ideas as to likely causes

Thanks all

CB500/550 / Boyer micro coil connectors - source for replacements
« on: May 27, 2019, 08:38:36 AM »
I need to replace a couple of the ignition cables on my bike which has a full Boyer kit with micro coils

Trouble is I can’t easily find where to source replacement brass connectors that push on the coil terminals

Can anyone advise where I can get them ideally on fleabay

CB500/550 / Carbs - is it just me !!!
« on: May 24, 2019, 02:21:45 PM »
God I am sick of messing about with my carbs. In the 3 years I have had this bike I reckon I have  had them off so many times I cant remember but each time I learn more.............

Latest is took them off for a head gasket change. Whilst off checked the fuel float levels etc etc on the bench a few times over 2 days. Right levels no overflow all looking good. I should have known better !!!

Put them back on bike and No 2 is overflowing despite prior bench testing, so bloody carbs off again to try and sort it.

Still not sure what is cause but I have a suspicion that the springy thing ( I had to open out the slot slightly for a previous fir of some aftermarket main jets so they are a bit loose fitting now)  slipped around and was stopping the float rising but I also have a feeling the float valve is not reliably closing so ordered new one from DSS.

Then to add insult to injury the springy thing snapped in two (new one ordered from Gerben) and as a final insult another thread stripped for the float bowl stripped ( I have already had 2 others helicoiled) as the screws have been in and out so many times!!!!

I have now ordered a helicoil kit and going to do it myself this time as my machine shop charges £25 for each helicoil

I am I alone in my ever growing hatred of 500 carbs and their reliability.

Rant over and back to garage !!!!

CB500/550 / Copper Washers on Cylinder head cover and side covers
« on: May 21, 2019, 11:37:30 AM »
Can anyone tell me what purpose these actually serve?

CB500/550 / Crich Tramway event This Year
« on: May 21, 2019, 11:19:22 AM »
Anyone organising Crich day this year (7th July). I cant make as am away doing Wild Atlantic Way on a modern bike

CB500/550 / DSS customer (or not) Service
« on: May 20, 2019, 02:44:27 PM »
I sent the below email to DSS last Wednesday - absolutely no reply. Seems like they are happy to take my money but wont go an extra few hundred yards to help

I just bought a 500 4 gasket set from you (p/no PFGS CB500F)

The image you show on your web site is an NE branded set BUT want you sent me was NOT Ne branded it was just in plain card packaging

Now there is known issue with aftermarket head gaskets and O rings where some aftermarket gaskets are thicker than the OEM gasket p/no 12251374306.

Where this is the case the O rings do not seal properly and there is Oil seepage from the head and I know this is not an issue with NE branded products.

Can you advise either of the below

1.   Is what you supplied NE branded
2.   Can you measure  the thickness of the OEM gasket (I see you have stock)

CB500/550 / O Ring Sizes as per Honda Parts Book
« on: May 14, 2019, 10:54:30 AM »
I just wanted to check I am right in my assumption.....

 Are O ring dimensions in the Honda parts manual quoted as Inside Diameter and Thickness which is my conclusion

CB500/550 / Head Gasket
« on: May 12, 2019, 07:24:49 AM »

I need to change my head gasket and can either buy the OEM one from DS OR I could get the aftermarket set from DS which gives me a complete engine set for same price

And advice on way to go our an alternative source of aftermarket stuff that works

Reason I ask as in an earlier post Trigger suggested that aftermarket ones are no good cos they are thinner and the o rings won’t seal which is the problem I have with an oil weep that is deffo coming from the head gasket level.

Strange as on an earlier build i used an aftermarket set and had no issues

CB500/550 / Front Brake adjustment question
« on: May 07, 2019, 12:44:41 PM »
I am having some issues setting up my front brake. I have adjusted it according to the manual so wheel spins freely but then when i squeeze the brake it seems to be binding.

I have checked and lubricated the swinging pivot and this is all moving freely so I cant understand why the brake is binding all the time.

Makes it a hard job to back it out of the garage as well!!!

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