Hi everyone!

[PatM]

I'm a newbie, so please don't snigger! But Im not new to bikes, as Ive had em since 1975. Just brought a 400/4 off ebay- to remind me what things were like when I last had one in the late 80's
This ones got some problems- well, it wouldnt be a vintage if it hadnt! It now starts first prod, ticks over ok, but will not rev over 4k or 5 k with the cover off the air filter. I stripped the carbs, plenty of cleaner- found loads of crud in them and removed it, found the jet rubbers worn and replaced them with donor jets with reasonable rubbers, but little improvement. I'm trying not to make this a life labour- I need to check the advance retard, but I'm sure its carbs?? any ideas or suggestions?

I don't want to shell out for carb rebuilds till I'm absolutely sure- as the funds are as ever limited and the wife's patience limited...:-0

anything would be a help, please!

Regards

PatM

[dave400]

Hello and welcome, I

[PatM]

Thanks for your comment Dave and if it is carbs, then Ill get there eventually. Im on standard pipes and points/condersors and coal- nothing techiie!

[dave400]

Nice looking bike Pat if the one in the photo is yours, I had my bike that colour but I put it back to the original blue......what colour are your plugs after a plug chop after a run under load at the max revs you can get?
Dave

[SteveD CB500K0]

Pat - put your location in your profile.

Help is always available (as long as it's not too far!)

Steve

[pae]

Hi Pat, welcome to the site,

Phil

[Spitfire]

Hi Pat, welcome, don't get tunnel vision about the carbs, check over everything else first, timing, valve clearance etc etc. Then get tunnel vision !

Cheers

Den

[PatM]

Overwhelmed with the positive response- Thanks! Dave asks what colour are the plugs? The answer is BLACK.
I have ordered a set of Keyster kits from good ol' USA and I

[SteveD CB500K0]

Maidstone - now you are talking!

There's a fairly active group of members in E London and Kent (and I'm in Canterbury fairly regularly)

If you get really stuck and need a second opinion, post here and we'll come over and drink your coffee!

Steve

[PatM]

Hi Steve, yes, i think you sold a nice tank to my bro the other week- Hes A 400/4 nut and is aiming for perfection!

[SteveD CB500K0]

Small world   

[PatM]

Keyster carb bits fitted and bike now revs like its should. need to ballance them as a bit flat at 3k but revs like billio so big smilles and now need to do a sensible list of things to do next before MOT time..