hey there new to the vfr4 just bought one over christmas for summer fun and ive come to run after its been stood for a month and the f**king things struggling miserably to go over 6000 its had new plugs in it carbs cleaned i dont think its a reg rec problems as the battery lifes fine and all electronics work ok any other clues please help is needed
cheers
nick

Has anything at all been tampered with?

they have a 5.5k restriction if the speedo is unplugged......

Welcome to the site..we'll sort it out

it wil rev all the way round but it just struggles past 6k i shall have a check on that though but the spedo was working last time i rode it

OK - so not the speedo if it makes it past the 5.5k

What stats it eh airbox in? Is it all there? not had anything chopped off or holes drilled etc?

classic symptoms of poor fuelling.

If you cleaned the carbs, did you check what jets are in it? Whether any washers under the needles?

diaphragms seated right?

my friends whos working on it (for the price of tea and biscuits i may add) says airbox is a-ok and complete he didnt check what jets are in as the bike ran fine when i got it ,diaphams fine and the no washers under the needles i may sacrafice a goat tonight see if that rectifies the problem

where you located?

pontefract west yorkshire bit of trip from wolverhampton sadly but any other nc 30 gods are welcome to come and have a gander

i say go for the goat sacrifice...worked for me!

I live in Sheffield, work in Wakey...

But, if your mate cleaned the carbs - but does ont know the jets, o whether there are washers on teh needles...then he cleaned the outside of them only..

Carbs will need checking to make sure it is not setup by a muppet.

nsimmo wrote:it wil rev all the way round but it just struggles past 6k i shall have a check on that though but the spedo was working last time i rode it

Sounds like it's restricted to me. If it is, it will still rev above 5.5 k, but only on two cylinders. You'll probably feel it vibrating through the seat like a tractor or similar above 5.5 k It will still get up to speed in first, but very slowly with no increase through the gears.

If the speedo is still working, it could be as simple as an unplugged connector behind the speedo. I'd give the loom a good going over before going any further