• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Got Snork? (airbox question)

  • Thread starter Thread starter Mr. Brown
  • Start date Start date
M

Mr. Brown

Guest
I'm doing my best to dial in my GS850, and you all have been tremendous.

I am missing the original rubber snorkel that was attached to the airbox. I've done a lot of work to seal the sides and ensure no leakage from box to carbs to engine. However, the airflow from the hole in the bottom of the box is a variable I want to nail down.

At the moment, about half of the port is covered (Duct Tape!) and seems to be doing fine. The plugs are a nice golden brown. I tried last week to seal up more of the slot, and crapped out the bike.

Anyone got any hints on exactly how much air should come through the slot? Better yet, Got Snork?
Thanks!
-=T=-
 
No clue on how much air, your plug color and way the bike runs are the best measuring tool, actually sounds like you're doing O.K.

You might want to check on Ebay, and see if you can pick up the airbox for your model.
 
If you can find an airbox to install that would be the best thing. If you get caught in the rain you could possibly pull water into the airbox through the bottom.. My 1000 had a missing snorkel when I got it and had a huge flatspot until I did a tempory duct tape job. I found one on E-bay. The one I got was actually from an 850 box but fit. If the side of the box looks like your box it should be the same airbox even if it is from a different model.
 
My 1100 is missing the snorkel and at the time I had it apart I couldn't find one. Put it back together without one and had to set the pilot fuel screws to around 3 but it runs the berries. Only draw back is a bit more intake roar under heavy throttle.
 
mark said:
No clue on how much air, your plug color and way the bike runs are the best measuring tool, actually sounds like you're doing O.K.

You might want to check on Ebay, and see if you can pick up the airbox for your model.
Click to expand...

The reason I'm still tweaking the box is because even though it runs pretty smooth, it ain't right. The throttle is a little jerky, and the max speed is about 60-65mph. I've had people warn me that this bike might be a little more than a starter can handle, but she's more of a kitty than a tiger. Its like it's not translating all its effort into speed...
 
Mr. Brown said:
I'm doing my best to dial in my GS850, and you all have been tremendous.

I am missing the original rubber snorkel that was attached to the airbox. I've done a lot of work to seal the sides and ensure no leakage from box to carbs to engine. However, the airflow from the hole in the bottom of the box is a variable I want to nail down.

At the moment, about half of the port is covered (Duct Tape!) and seems to be doing fine. The plugs are a nice golden brown. I tried last week to seal up more of the slot, and crapped out the bike.

Anyone got any hints on exactly how much air should come through the slot? Better yet, Got Snork?
Thanks!
-=T=-
Click to expand...

With VM26ss carbs fitted ('79 GS850), the intake area of the snorkel is slightly less than the sum of the cross section area of the inlets of the four carbs. If you add the cross section area of the 8 x 10mm holes at the bottom of the airbox to the snorkel inlet area, you have an exact match up to the sum of the carb inlet areas. Now ain't that a coincidence!
Try and source a snorkel and take advantage of Suzuki getting it right.
That's assuming that a PO hasn't experimented with different jetting!
 
An 850 that only goes 65???
It should double that, it is making only a fraction of the power it should be.
There's more wrong than a few holes in an airbox.
 
tkent02 said:
An 850 that only goes 65???
It should double that, it is making only a fraction of the power it should be.
There's more wrong than a few holes in an airbox.
Click to expand...

Where would you look first? Compression Test?
 
After reading a few more threads, I think I may still need to investigate the air intake area. I just bought an airbox from Ebay, complete with snorkel. I'll seal that sucker up, and replace the o-rings between the engine and the carbs. I inspected them earlier, but I'll get some new ones while I'm in the neighborhood.

Several threads mentioned a bogging down over 4500k RPM being attributed to too much air, or not enough fuel. I'll also check the petcock / filter for any resistance there.

Am I missing anything?
Mr. Brown said:
Where would you look first? Compression Test?
Click to expand...
 
Valve clearances way off, cams worn so very little valve opening, no compression due to broken rings or whatever, ignition timing way way off, exhaust clogged, throttles barely opening, bird nest in the airbox, could be a myriad of things but is probably a combination of some of these, maybe others.... Does it just stop at a certain RPM or does it run out of power?
Going 65 takes roughly 1/4 to 1/8 the power it takes to go 125 or so, the engine is seriously deficient on power. If it just stops at that RPM but has good torque at lower speeds that is a different animal.
Good luck. And if you are near some experienced GS types, they may see something obvious to them that you may not have thought of.
 
tkent02 said:
Valve clearances way off, cams worn so very little valve opening, no compression due to broken rings or whatever, ignition timing way way off, exhaust clogged, throttles barely opening, bird nest in the airbox, could be a myriad of things but is probably a combination of some of these, maybe others.... Does it just stop at a certain RPM or does it run out of power?
Going 65 takes roughly 1/4 to 1/8 the power it takes to go 125 or so, the engine is seriously deficient on power. If it just stops at that RPM but has good torque at lower speeds that is a different animal.
Good luck. And if you are near some experienced GS types, they may see something obvious to them that you may not have thought of.
Click to expand...

I've got a gasket on the way, and I'll be checking the valve clearances as soon as it arrives.

I observed its behavior closely, and it bogs at 5000rpm regardless of speed or gear. I've had the carbs off a few times and the throttles seem to be fine. I haven't looked at the exhaust yet, although I know I have a small hole underneath my left foot peg. I can't believe this is hurting anything.

I'll report back post-airbox retrofit and valve check.
 
So I got the new airbox on. I took my time with this one as I didn't want anything to keep me up at night. I made sure there were no gaps in the seal between the box and the filter, and used silicone caulk to seal around the boots and the box. I also used automotive weatherstripping to ensure no leaks around the lids... so now the only air is coming in through the snork and the holes at the bottom...

What a huge difference! \\:D/ She'll go 85 on accident. I have yet to get on the beltway and see what sustained high speeds are like, but this is a whole new bike!

So now there's the euphoria of knowing that the engine really will work like it should... and the depression of moving onto the next quirk. That is, she doesn't charge herself. I KNOW, I KNOW, stator papers... got it. I've kinda ignored this issue and lived off the trickle charger as I was only making short trips anyways.

On to the next fix. Thanks to everyone for their input so far...
 
Mr. Brown said:
So I got the new airbox on. I took my time with this one as I didn't want anything to keep me up at night. I made sure there were no gaps in the seal between the box and the filter, and used silicone caulk to seal around the boots and the box. I also used automotive weatherstripping to ensure no leaks around the lids... so now the only air is coming in through the snork and the holes at the bottom...

What a huge difference! \\:D/ She'll go 85 on accident. I have yet to get on the beltway and see what sustained high speeds are like, but this is a whole new bike!

So now there's the euphoria of knowing that the engine really will work like it should... and the depression of moving onto the next quirk. That is, she doesn't charge herself. I KNOW, I KNOW, stator papers... got it. I've kinda ignored this issue and lived off the trickle charger as I was only making short trips anyways.

On to the next fix. Thanks to everyone for their input so far...
Click to expand...

Well done. The 850's really perform well once you sort out the correct air/fuel ratio across the whole rev range.
Do some plug chops at various rpms to check that your jetting and needle positions are correct.
Do an integrity check of your battery first before you rip into the stator/regulator senarios.
Good luck.
 
You must log in or register to reply here.
Back
Top