fuel starvation?

[yorky10]

hi ,yorky again[R regd400-4],all new carb needles, jets,floats reset,21cm as per the book took apart again,air line in every orifice,timing checked new plugs,now it fires touch of button revs up for a few seconds,dies out.its on its last chance,any ideas.very tired,large scotch later things don't look any better.yorky

[Norniron]

Is your tank vent clear?

[yorky10]

Yes,i have not fitted it yet,?yorky

[hairygit]

How about the internal filter on the tap, is fuel flowing fast enough from the tap? Unfortunately cleaning the filter on the tap involves removing it from the tank

[PatM]

Yorky- Did you solve it? Im going back through old posts as I have a similar issue. The bike starts on the button, but has no power after 3k, coughs and splutters as you give it some gas. So, I REPLACED the carbs with some I had rebuilt, new everything. Still the same. I had the fuel tap off a while back and cleaned the filter- Ive even put an inline one it, as I suspected fuel problems. There seems to be a healthy steady fuel fill from the tank, so Im sure its no longer petrol starvation. I cant imagine its points, as I checked them and the timing a while back and it was running fine. I just hope its not something more serious, like a burnt-out valve.

[PatM]

Oh, don't you just love it when you end up answering your own post and somewhat tail-between -legs for a self-inflicted wound. Anyway, owning up to a problem and hoping I will learn and others might- The problem was that I had put a replacement aftermarket seat on the bike and not ridden it- the seat was blocking off the air-intake. I wouldn't mind, but Id actually had this happen once before, so didn't learn. I took the plugs out and they were sooted up- that was the clue- no air. Anyway- its running now, plenty of poke and revs up nicely. Its a bit hesitant till over 3k, but I think its always been a bit that way- its nearly 2 years since I rode it. Ive ordered a set of replica pipes from DS and some points- to give the old girl a new lease of life. The Hondas just one of those bikes I haven't ridden- you cant ride them all, can you?

[K2-K6]

That is amusing PatM, I remember friends doing something similar years ago by putting things like waterproof over-trousers under the seat and getting the same result.

At least you've got it sorted and can take it out in the good weather.

[PatM]

Note to self and anyone else fitting a fibreglass framed seat- THERE ARE NO BUNGS HOLDING THEM CLEAR OF THE FRAME- you have to fit your old ones.....otherwise the seat and fat arse cover up the carb intake...

[yorky10]

bike polisher,tried every thing still no good,not put air filter back on yet so its not your problem..need another set of carbs to check if its my carbs at fault.?yorky .any chance any one got a spare set buy or borrow,

[PatM]

Yorky- Some nearer will help with a loan set of carbs- Im too far away to be of any help. It does sound like fuel starvation- ie, floats not moving or float bowls not filling. My petcock filter was vey bad when I first got the bike- Im amazed I even got it started,

[Rozabikes Tim]

Hi Yorky,

I did offer my carbs to try before. They are on the bike but no airbox etc so simple enough to get off. Just across the village from you. If you wish I will gladly pop round with them and add my 5 peneth!

Tim

[yorky10]

tim,any help would be very welcome,at the moment I am not doing much after an operation,if offer still stands in a while the imput of a fresh brain may just solve matters,in the mean time I will keep looking for a set of carbs.your welcome to come and look.yorky

[Rozabikes Tim]

Hope the op not too major. Let me know when you are up to it and I will pop round. PM me with address / phone number. Got a lot on myself for the next week or two.

Tim

[yorky10]

will be in touch in a while,thanks again ,yorky

[yorky10]

Tim after total rebuild of carbs every spring. washer .jet .fuel runs ok.rubber seal. all been looked at cleaned,the bike now starts on tick over no choke,runs ok ,but still wont rev without choke,float heights spot on timing spot on.?yorky