Bogging...

[89cb1]

So yesterday I did a tune up on my bike. I did an oil change with Ams-Oil full synthetic and spark plugs. I also removed the old air filter element and put in a foam one. While I was in there I also removed the snorkels on the air-box and now when I drive the bike it bogs out like it's running out of gas. I put in platinum NGKs but they didn't have my exact plug, it is one number lower, so it runs a bit cooler. I highly doubt that this is the problem, I didn't check the gaps on the spark plugs because they are platinum's but it's the only thing I can think of. I was also told that my fuel filter may be clogged now since I moved the tank around. Anyone have any other ideas?

[Drewski]

Have you still got the original filter? If so, I'd stick that back in to make sure that's not the problem. 'No real reason to run platinum plugs. A waste of money IMO.

[xstreamcanadian]

what about vacuum leaks? any hoses off? I agree on the platinum plugs, they are shite for the money. Is there any reason to replace that bad ass honda air filter with a foam one?

[Daveontheedge]

I have the same problem with a stock filter and the snorkels removed. I thought it might be running rich, not getting enough air flow possibly?

[91cb-1]

I'd reckon it's the oposite, you're getting too much air flow because you still have the standard carb set up and therefor are not getting enough fuel, the fuel to air ratio IS an exact science, you can't expect your engine to run on more air than fuel, if you want to tune up your engine you have got to do the whole lot together, more air intake is useless without more fuel intake. Honda designed the bike to be like it is, with paper filter and snorkels, they're not idiots!

[oldsmoker]

  I spent a good bit of time playing with the jets and air flow on mine after I put in a foam filter. I had also removed the snorkles but could not get the bike to cruise steady at highway speeds (55 to 75 mph). When I put the snorkles back on the issue cleared up.
 You should still step up a jet size as this bike was set up lean from the factory and a lean bike will run hotter and can seize up.
 
 I have a theory about the snorkles. Because air is fluid, it is subject to flow AND pressure. We have all seen the wedge shape of the air box, the location of the air inlets at the top front of the box and the cupped opening at the nose of the fuel tank. Without the snorkles, its a direct line into the airbox. At speed I believe the air pressure builds to the point of overwhelming the carbs.
  With the snorkles more restrictive  and rearward facing opening that pressure is allowed to bleed off before it enters the air box. That allows the carbs to DRAW air in as opposed to having it RAMMED in and messing with the air/fuel mix. You may have noticed the bogging more when facing a headwind or passing larger vehicles ( greater air pressures), I know I did.
 Now, ram-air is OK if you are at wide open throttle most of the time, like on the track, and I did find that I got much better acceleration, but, for the road it sucks unless you want to look like a non-driving Pointdexter.

[91cb-1]

If you're gonna remove the snorkels i'd say you'd want to remove the fuel pump as well as this would alow for the vacum that the air into the carbs is creating to suck more petrol in with it, but you'd deffinately have to rejet the carbs and possibly upgrade your exhaust too. i have mine standard and as is she will get up to 115 MPH i do plan to jet the carbs as well but if i do that it'll be the dyno jet stage 1 and i'll have to make a foam filter for it. i have an other air box and old filter to mess with though and i was thinking of turning the snorkels around to face the front of the bike to allow for more air intake but i deffinately wouldn't remove them.

[Daveontheedge]

Basically I removed the snorkels to make room for the ballasts and wiring for my HID conversion. So far it has really only been a problem between 110 and 120kph, I don't notice it as much in the city unless I hammer on it, then it is slow to react. Have been considering removing the airbox all together and fitting some pod filters, for that I know I would definitely have to re-jet, but is changing the exhaust really necessary? I guess to allow for more flow? Has anyone tried fitting pod filters?

[89cb1]

Ya that makes sense. Does anyone know what the spark plug gap is? I want to check it since I have to take it all apart again anyways.

[Chris4564]

Ya that makes sense. Does anyone know what the spark plug gap is? I want to check it since I have to take it all apart again anyways.

Should be 0.8 - 0.9mm

[91cb-1]

Basically I removed the snorkels to make room for the ballasts and wiring for my HID conversion. So far it has really only been a problem between 110 and 120kph, I don't notice it as much in the city unless I hammer on it, then it is slow to react. Have been considering removing the airbox all together and fitting some pod filters, for that I know I would definitely have to re-jet, but is changing the exhaust really necessary? I guess to allow for more flow? Has anyone tried fitting pod filters?

Not exactly necessary because it's only a stage one dyno kit but if you wanted to get 100% upgrade performance changing the exhaust would certainly do the trick! there's a page up here that's got someone who put pod filters onto their -1 you'd have to go searching

[89cb1]

So I put my snorkles back on and it made a huge difference. Thanks guys!