Category Archives: The Workshop

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Honda CV Carb – anybody know there way round them ?

Category : The Workshop

Honda CV Carb – anybody know there way round them ?

Long story – kind of stuck on getting the Cb450 running right. She’s a ’72 bike;, with the original Keihin CV Carbs. Complex bloody things – made worse by 45 years of wear and tear. I’ve stripped the carbs and cleaned them – many times – and rebuilt them with new gaskets and jet kits.

Where they’re at currently is the bike starts and runs ok, pulls really well from the midrange and on up – but – the air mixture screw still isn’t working properly on one side. Makes it hard to get a smooth idle, and to me, the bike feels lumpy and generally unhappy pulling off idle. Not the worst problem in the world, but it’s bugging me that it’s not right,

According to the manual:

“Next, adjust your “air/mixture screws”. Usually, 3/4 turn out from full in will be a good place to start. Adjust back and forth for maximum rpm, on each carb. If you end up at some extreme, like all the way in or 3 or 4 turns out, you have a problem somewhere in the carb – probably indicates a good cleaning is in order. These carbs must be kept scrupulously clean to work properly.”

One side works as described above – but on the other, the screw does bugger all until it’s almost all the way home, and then you get maximum rpm when it’s fully closed.

I’ve swapped the needles around, put the old ones back in, tested the damn thing for air leaks by spraying carb cleaner on the outside, but can’t make any headway at all – the screw on that side just doesn’t seem to be adjust the mixture the way it should.

Anybody any pointers or steers on anything else to try from here ?


Source: Honda CV Carb – anybody know there way round them ?

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Leaking sump plug

Category : The Workshop

Leaking sump plug

Is friend has a sump that’s leaking oil. It looks like the previous owner cross threaded the nut and [email protected]@ked up the threads. Can’t find a replacement sump so what’s the best option for him. He’s in Cork if anyone has any recommendations on some business that could help him out. Thanks in advance.


Source: Leaking sump plug

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Gonna have to start somewhere

Category : The Workshop

Gonna have to start somewhere

MIG, TIG or ARC?

I’ll only use if for the bikes to start with.

And will the occasional aldi/lidl yokes do me for me or should I look elsewhere?


Source: Gonna have to start somewhere

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Weld a nut to a rounded stud?

Category : The Workshop

Weld a nut to a rounded stud?

Got three of four allen key studs out of a soon to be replaced rear brake disk. Fourth is fecked and I need a nut welded to it to remove it.


Any recommendations, starting from Dublin 14 or 16 please?


Source: Weld a nut to a rounded stud?

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rd 350 lc running poorly

Category : The Workshop

rd 350 lc running poorly

Right folks, a tough one for ye experts,


i have a 1982 rd 350lc with new motor rebuild, i have standard airbox and main jets are 240,needles are set in standard position,she has period micron exhausts


the bike runs good in first and second powerband kicks in at about 6k revs, when i hit 3rd she struggles to reach powerband, in 4th she struggles to maintain 50 to 60 mph on the flat, have not got a hope of reaching 5th or 6th,


standard jets are 220 i went to 240 because of the microns, i do have spare 250 and 260 size jets


so on rd forums they differ alot with their answers, some say rise the needle a notch, some say use 250 or 260 jets


so lets hear ur thoughts on her thanks in advance:thumbsup2:


Source: rd 350 lc running poorly

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Battery box

Category : The Workshop

Battery box

Looking to have a battery box made up,anyone on here willing and able. Or who would you recommended in the greater Dublin area. TIA


Source: Battery box

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CB450 Shocks – shorten/replace ?

Category : The Workshop

CB450 Shocks – shorten/replace ?

I’ve been slowly working slowly through the never-ending to-do list of jobs on the ’72.

Have to deal with this one before it ends up destroying the two silencers on me as well:

Link to Photo (1288 kB)

The shocks on her are about half an inch too long – 13″ / 335 mm between the bolt-centres as opposed to the 12.6″ / 320mm originals.

The ones on her ( I think) are the budget replacement shocks off the David Silver site listed for the CB450 – which are only available in that 13″ length.

Only option I have at the moment seems to be to cough up for a set of custom Hagon shocks – which aint cheap.

Realistically – is there any way of shortening the shocks that are on her, or doing something else to create some clearance between the back axle and the silencers ?


Source: CB450 Shocks – shorten/replace ?

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full exhaust paint ?

Category : The Workshop

full exhaust paint ?

well folks whats the best exhaust paint ?


Source: full exhaust paint ?