Where do you live?
You need to find someone local that can balance and set up bike carbs as a starting point imo
I bought a 918 blade indy round 6 months ago
Absolutely love it but it's not running 100%
It doesn't start as well as it used to and seems almost lumpy on idle.
I noticed it was almost miss firing when I was high up the revs, more noticeable at about 60mph
It's gradually got worse, so I stopped using it incase I did damage
I had a local garage look at it briefly and he seemed to think one of the slides were lifting out of sync.
Suggested I buy 4 new diaphragms and take it back to him, but having priced them up they are 200 each.
I'd want to be 100 percent before doing that. Guess I need to look at them and check for damage.
Anyone had anything similar, or my ideas before I get a specialist to look at it.
I'm not that mechanically minded but happy to have a go at the basics.
Ps thanks in advance
Do you know if its dynojetted?
Where do you live?
You need to find someone local that can balance and set up bike carbs as a starting point imo
How long has the fuel been in the tank?
I had that issue with condensation in the fuel tank.
quote:
Originally posted by CosKev3
Do you know if its dynojetted?
Where do you live?
You need to find someone local that can balance and set up bike carbs as a starting point imo
quote:
Originally posted by jossey
How long has the fuel been in the tank?
I had that issue with condensation in the fuel tank.
Inspect the diaphragms first, they are very easy to get to provided the screws on the carb tops aren't seized. Pointless trying to source new
ones if the old ones don't have hole in them.
More likely is you have a blocked pilot jet or two in the carbs, which will give poor starting, poor idle and poor part throttle response.
Also check HT leads, assuming the original leads and coils are being used, my 918 Fireblade had a bad intermittent misfire caused by an HT lead
breaking down.
quote:
Originally posted by Jasmcauley
quote:
Originally posted by CosKev3
Do you know if its dynojetted?
Where do you live?
You need to find someone local that can balance and set up bike carbs as a starting point imo
you're not too far away
quote:
Originally posted by Jasmcauley
quote:
Originally posted by CosKev3
Do you know if its dynojetted?
Where do you live?
You need to find someone local that can balance and set up bike carbs as a starting point imo
you're not too far away
what do you mean?
*Fills generator with fuel*
few things to check from my own experiences...
whip the carbs off and take the covers off
get some carb cleaner give them a good spray
take out the jets and spray inside
make sure theyre in and nipped up (mine have been loose before and caused issues) dont over tighten though
give the diaphrams a slight stretch to see if there are obvious holes
buy a balancing kit off of ebay (dead easy to use!)
theres small bolts under each carb (on 3 of the cyclinders, number 3 already has a built in port as this is your 'baseline'
connect the other three test ports and pipes from the gauges
fire up the engine
adjust the balancing screws until they all match whatever cylinder 3 is reading
take the hoses off and pop the little bolts back in
change fuel filter
new fuel
as matt said.
it might be a sticking float.
Id be amazed if its a diaphram.
Fuel filter might be ready for a change too.
But most likely some crap has blocked a hole in the carbs somewhere.
Carbs can be weather sensitive so consider that.
oh and worn coils/leads/plugs
Had an issue with the float sticking previously...
Was just filling with fuel and pouring out the top.
I took the float bowl off and I gave it a check, put it back on and it seemed fine afterwards.
I diss missed that being the issue as I thought the symptoms was fuel pouring out/over filling
I could be wrong it seems.
I'll order a fuel filter and give it a clean this weekend.
Anything I can do wrong be taking the tops off to look at the diaphrams ?
quote:
Originally posted by maccmike
oh and worn coils/leads/plugs
Dont dismiss anything! that was my problem!
I was plagued for ages with mine not running right because i was sure the jets were fine... then it turns out it was loose and ended up rattling out
it doesnt take long at all to strip down and clean the bits of the carbs that need cleaning
the jets are small and can block very easily, so its best to whip them out and give them a good clean.
aslong as your sensible when taking them apart then you are fine, just do it somewhere reletively dust free and clean
I've just come across this for you! very helpful indeed!!!
In the 7th photo, take out the biggest brass part witrh the hex on it and clean it and inside where it sits, and also the one to the right of it
(these are the jets)
http://cbrforum.com/forum/how-mechanical-40/how-clean-your-carbs-40713/
[Edited on 11/11/14 by Matt21]
That looks quite straight forward.
I might do it one at a time to make sure.
I'd rather take an hour longer and do it right.
Do you recommend I spray everything? And wipe right ?
Obviously the diaphragm and slides will be delicate , I believe they are one piece ? Hence the excessive cost.
Back up plan if I do find a hole.. Do these look right?
I'd have to check exact year and model obviously, but damn cheaper than the 200 Honda want
HONDA CBR900RR CBR1000F CARB SLIDE DIAPHRAGM 1993 - 97
quote:
Originally posted by Matt21
Dont dismiss anything!
I was plagued for ages with mine not running right because i was sure the jets were fine... then it turns out it was loose and ended up rattling out
it doesnt take long at all to strip down and clean the bits of the carbs that need cleaning
the jets are small and can block very easily, so its best to whip them out and give them a good clean.
aslong as your sensible when taking them apart then you are fine, just do it somewhere reletively dust free and clean
I've just come across this for you! very helpful indeed!!!
In the 7th photo, take out the biggest brass part witrh the hex on it and clean it and inside where it sits, and also the one to the right of it (these are the jets)
http://cbrforum.com/forum/how-mechanical-40/how-clean-your-carbs-40713/
[Edited on 11/11/14 by Matt21]
theyre not delicate as such.... just obviously don't break them! youll get an idea when you get them out
yer just give everything you can a good spray, no need to wipe it off as it will evapourate, unless its very clearly dirty, then you may need to have
a wipe, it does no harm though