94 Honda vfr750 starting problems

[Dan1]

Hi all im new to the forum and looking for a bit of help. I ve been tasked to get a friends vfr750 started after being sat and not even attempted to start for 7 yes seven years!!!!!!!
There was no ignition at all but after a quick fiddle got that sorted. Moved on to seeing if it would start which it coughed and spluttered a bit and ran for a split second but was spewing fuel from the carb overflow so i aborted. i took the carb bank off and cleaned it all up in a dedicated parts washer with proper cleaning solution and checked the jets where all clear. 3 of the floats where jammed and most of the jets where clogged which i thoroughly cleaned and ensured where free moving etc. I removed the fuel tank and dumped the old stuff, cleaned the tank out with an industrial pressure washer and soaked the pickup in degreaser as it looked like a solid pipe it was that bad!!! Now it looks brand new and nice and clear. Fitted new fuel pipe and filter. I put it all back on the bike and filled with new fuel and attempted a start. First tho i flushed the pump into a bucket and the pump was pushing well. Placed the fuel pipe on the carbs and fired it up............ or not!!!!
No roar! It just wont fire up. Checked spark at the two rear most plugs which was fine, plugs where a bit wet with oil/fuel but it was sparking. When i crank the bike with no choke then choke it as it turns i can hear the change in engine note as i take it fuel enters the chambers. Again tho no roar!! There is fuel in the float bowls of all 4. Could it be the battery? I have it hooked up to a charger as it drains quick and i give it 10 mins to charge then attempt a crank which i get a decent rate of turnover but then drops off quick so need to let it charge again. If i pour a bit of fuel in each carb flute and crank it it fires and runs for a few seconds then stops. Any ideas as im baffled??? Can the carbs airlock?? Every now and then the bike splutters a bit but doesnt carry on.
Cheers all.

Dan

[Polarbear]

First thing is to get a new battery. It will be fucked after standing for seven years.

Eliminate obvious sources of problems and you will eventually find whats wrong and the battery is one such source.
____________________
Triumph Trophy Launch Edition

[Dan1]

Hi mate sorry I should have said. The battery is brand new but has taken a battering trying to start it the last few weeks. I'm wondering if it just needs time to draw fuel through then it may start but the battery can't hack a constant turnover.

[Zen Dog]

[Vincent]

I'd recommend having the carbs ultrasonically cleaned. I don't know if there is a similar service in the UK but there's a guy in the States that runs an exchange system for VFR carbs.
____________________
Space Is Deep

[Dan1]

[Zen Dog]

Ok, I think I know what you mean.

If theres definately fuel in the float bowl, and the engine runs briefly if you pour some petrol into the carb down the airbox tube (interesting technique btw!), I can only logically conclude (and probably completely wrongly), that the problem is somewhere between the two. So needles?

Zen Dog
____________________
Current - '94 VFR750FR (Dead), '00 VFR800FI, 2011 CBF125 Previous - '10 Street Triple R, '92 MZ ETZ301, '05 TTR250, NSR125R, KMX125, "Honda" Win (chinese copy of an old Honda design with a C90 engine)
My bike trip around S.E. Asia 2010/2011

[Dan1]

Ok cheers mate. I'm getting the bike delivered to me as travel distance to it and back is a ball ache! I'll whip the carbs back off and have another look inside.
Cheers.

[mr jamez]

Why was it laid up for 7 years? Have you asked your mate why he stopped using it...
____________________
NSR 125F > BROS 400 > NC30 > BROS 400 > Trumpet S4 > '97 VFR 750

[stinkwheel]

Is your fuel pump pumping fuel?
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[stinkwheel]

Oh. Another thing.

If it fires up, strenuously resist the temptation to touch the throttle or it'll die immediately. If they've been sat a long time, they usually fire up on one cylinder, the other three kick in one at a time. If you open the throttle before it's running on all four, it'll cut out.

Only once all four are firing on full choke and the revs have risen to 2,500-3,000rpm should you start to give it some throttle.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Dan1]

[Dan1]