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1981 GS850G, needle jet circuit help? Bike won't rev past 3k or so

  • Thread starter Thread starter Zaos
  • Start date Start date
Those filters are just steel mesh....I guess they’ll keep bugs out. Those filters have been known to cause headaches because that inner ridge blocks an air jet or two; so check that. I’ve neverUsed them, but a lot of people have and usually recommend against them. APE Racing pods are lower priced than the k&ns, but work well.
against those, I’ve
 
Very embarrassing !! I owe you an apology. Never meant to mislead anyone. That being said, I've never seen one heat range make any noticeable difference. I'd have thought you could have put any, available heat range in there & it would have not made the difference you're seeing. Glad you got it going & hopefully the filters will work well for you also. Looks like you're getting there. Keep it up.
 
Zaos said:
I ordered this set exactly
https://www.ebay.com/itm/191523200960
Click to expand...
May I make a suggestion? :-k

While you are waiting for those "filters", fold a shop rag in half, drape it over the carb intakes. Use band clamps or zip-ties on the outer carbs to hold the rag in place. Proceed with all your jetting and tuning.

When the "filters" get there, toss them in the trash can. Your shop rag will provide better filtration and predictability for tuning.

.
 
It most certainly wasn't the move of one heat range that made a difference - more likely the old plugs were fouled, defective, or counterfeit.
I've had the exact same experience of an engine burst into life with new plugs, where with the old plugs it was a pig to start, even though they looked fine.
 
Steve said:
When the "filters" get there, toss them in the trash can. Your shop rag will provide better filtration and predictability for tuning.

.
Click to expand...

Couldn't agree more. Being cheap doesn't agree with CV carbs. Your bike will never run well with those.
 
Zaos said:
They are cheap, and I figure any leaks that they have between housing and filter I can fill with some silicone?
Click to expand...


Nope. RTV silicone will deteriorate in the presence of gasoline vapor. Even the intake side gets enough vapor to make RTV fall apart.
 
APE pods look and perform comparable to K&N, and are half the cost (still about $75).
 
So the filters came in, and the bike revs and drives just fine. I dont notice any hesitation or backfiring at all while test driving it.

Honestly I just wanted some cheap filters to test the bike, I still have some work before it's totally done.

Could you guys link the ape pods? Cant really seem to find em, though I might just be blind!

Unrelated, but does anyone know where to get a vacuum hose from petcock to carb? All the sizes I'm finding have way too big of an outer diameter to fit.
 
single layer of red shop rag is sufficient..two may be too thick and actually induce a bit of choke. I use 1 layer when tuning with the airbox off..basically youre tricking te carb to think its getting the engineered in amount of required...let me say that again... REQUIRED restriction to operate correctly.
 
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