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I'll check that out. I thought it would maybe add a bit more performance to have the crank breathers leaving the airbox via a tube and then the only air is fresh air filtered from above the filter. I'm sure Honda know what they're doing (or done) but to have have hot oily air can't add to performanc...

When I took it apart I saw that that two crank breakers put the air back into airbox under the filter panel. Has anyone done a mod to have a tube leave the airbox so it only draws air from above the filter?

I'm assuming that it's now drawing the air through the filter and making it more breathable which would explain why the coughing and spluttering less frequent.

Well the filter has been on there since I bought the bike last year. I did balance my carbs too and they were way out.

Well I sorted that. No better. Changes the petcock rubbers, front coil and spark plugs. No better. checked for vac leaks and tightened everything up and went for a ride and the further I rode it got better. Now when I put the filter back on I used the K+n oil spray. My theory: is it possible I used ...

sweet. I'll try to get it as close to 0.5 inMg difference as possible. gives me a 0.3 tolerance

Hi, sorry to revive an old thread but I do have a question. Reading the honda service manual it says the difference in vac between the front and rear is 0.8 inMg. Now does this mean the front has a bigger pull than the rear or the other way around? for example: (random vac numbers rounded to 1 inMg)...

It's all back together properly
I thought maybe this was responsible for the issues and symptoms I was having?

and if the front one was restricted by someone putting the air box base on and squashing it......then what?

Took the airbox apart today. Removed the base after taking off the air funnels etc and the crank breather hoses. Connected to the box are 2 2" vertical pipes from the carbs.What do they do and what would happen if one were to be restricted?

Yeah saw it was my 9th after posting :) There are no leaks from what I can see and pipe up to the valve is all good. I have Danmoto GP pipes, k+n filter and I have different jets from standard but I don't know what. It did literally happen overnight. Under acceleration it pulls like a train, let go ...

Hello, all :) I think this is my first post on here so here it goes...... Ok... when I'm riding along in any gear past 4krpm and hold the throttle gently the bike sounds like it's starved of fuel. It splutters, coughs and poofs (scientific term) back through the carbs. Letting go of the throttle it ...

thanks guys. will give these things a go when it stops raining and let you know how i get on

yeah it's a venhill one :D I've tried syringing, vacuum bleeding (which i've learnt isn't that great) and conventional bleeding with a valve and hose. here's a question. When I bleed from all 3 points (that being both calipers and the banjo) and I open by 1/8 of a turn on the nipples there is just f...

thats exactly what I did. fitted one line at a time and tested the caliper and they were great. Yes I have all the copper washers in place. I have a banjo bolt that I can bleed too. Would a 3 line system be better than a 2 line system?