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Re:Trying to wrap my head around PO mods
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TOPIC: Re:Trying to wrap my head around PO mods
#1009987
Kaz (User)
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Trying to wrap my head around PO mods 9 Months, 3 Weeks ago  
Hey guys
I recently bought a 1999 1600 RS. when I bought it, it had the stock air cleaner and stock exhaust on it and it ran reasonable, it would bogg at anything over 3/4 throttle. So a few days after the purchase the PO calls me up and says he has a bunch of parts for the bike I need to come pick up, in those parts was a used K&N filter set up, and a brand new stock exhaust.( cool eh) Anyway a couple of weeks later I decided to strip it down and find out what I bought as well as give it a thorough cleaning. The first thing I found was a rotten intake(replaced) then(Since I had it off anyway) let's look at the carb. PMS turned out 3 1/2 195 main and 57.5 pilot @ sea level,(haven't checked the needle setting) this doesn't sound like a stock setup to me. (actually it amazes me that it runs not that bad)
Now for my question, I'm going to be running stock exhaust with the K&N set up, what should my numbers be? I'm thinking 165 main 37.5 pilot what needle height should I be at?
Thanks
 
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#1009994
SKWEARpeg (User)
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Re:Trying to wrap my head around PO mods 9 Months, 3 Weeks ago  
Kaz wrote:
Hey guys
I recently bought a 1999 1600 RS. when I bought it, it had the stock air cleaner and stock exhaust on it and it ran reasonable, it would bogg at anything over 3/4 throttle. So a few days after the purchase the PO calls me up and says he has a bunch of parts for the bike I need to come pick up, in those parts was a used K&N filter set up, and a brand new stock exhaust.( cool eh) Anyway a couple of weeks later I decided to strip it down and find out what I bought as well as give it a thorough cleaning. The first thing I found was a rotten intake(replaced) then(Since I had it off anyway) let's look at the carb. PMS turned out 3 1/2 195 main and 57.5 pilot @ sea level,(haven't checked the needle setting) this doesn't sound like a stock setup to me. (actually it amazes me that it runs not that bad)
Now for my question, I'm going to be running stock exhaust with the K&N set up, what should my numbers be? I'm thinking 165 main 37.5 pilot what needle height should I be at?
Thanks


You'rer not looking at the correct Pilot, or you're reading 57.5 instead of 37.5. It's the tall thin jet. It looks completely different from the main.

If you're going to leave the stock intake and air filter on the bike, the stock Pilot is a 35, and the stock main, is a 165. Both of those are Mikuni's.

It sounds like somebody has been messing with carb already. If it is a 37.5, look for a square in a square with an R stamped on the body of the Pilot some where. The same thing, on the main. It's possible somebody rejetted the carb with a DJ kit. If the square in a square stamp is missing, assume they are DJ jets.
The DJ 37.5, is the same as a Mikuni 35. The 195 is way big. Especially, with stock pipes and jetting. See the DJ to Mikuni conversion chart on the tech articles page in the carb section.
What kind of K&N set up?
Look and see how many grooves the needle in the slide has on it. You can see reference pics etc., on the Tech Articles page.
 
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Last Edit: 2017/05/04 10:56 By SKWEARpeg.
 
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#1010043
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Re:Trying to wrap my head around PO mods 9 Months, 3 Weeks ago  
K&N E-3495 Air Filter set up with stock exhaust cones removed and four 1/2" holes in each.
With a little more digging the main is a Keihin which crosses to a 162.5 mikuni and I found the box R on the pilot it's a little mashed looks like someone had a little trouble getting it off under the magnifying glass it still looks like 57.5 but with the box R it's probably the stock 37.5. played with the PMS out to 3 3/4 stopped the decel popping
Took it out today for a little playtime, it handled like all the Stars with style and grace, love the torque in the twisties tons of bottom end. Think I might be in love.

thanks for the quick response.
 
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#1010050
Father_Pobasturd (User)
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Re:Trying to wrap my head around PO mods 9 Months, 3 Weeks ago  
With your PMS out that far it's likely to fall out. KEEP YOUR EYE ON IT. oTHERS HAVE FOUND WAYS TO SECURE IT.
 
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#1010059
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Re:Trying to wrap my head around PO mods 9 Months, 3 Weeks ago  
Kaz wrote:
K&N E-3495 Air Filter set up with stock exhaust cones removed and four 1/2" holes in each.
With a little more digging the main is a Keihin which crosses to a 162.5 mikuni and I found the box R on the pilot it's a little mashed looks like someone had a little trouble getting it off under the magnifying glass it still looks like 57.5 but with the box R it's probably the stock 37.5. played with the PMS out to 3 3/4 stopped the decel popping
Took it out today for a little playtime, it handled like all the Stars with style and grace, love the torque in the twisties tons of bottom end. Think I might be in love.

thanks for the quick response.


Like PB said, your PMS is way to far out. The K&N filter setup and the stage 3 exhaust, would let you run a 37.5 Mikuni Pilot, and a 167.5 Mikuni Main, quite easily. Is the AIS still on the bike? If so, I'd remove it. The AIS will cause the decel popping in the exhaust. You can get a kit from Barons, or, some of the guys use used .45 shell casings, to block the holes in the heads.

Other things that can cause decel popping, are intake leaks from bad seals at the manifold to head joint, Coasting enricher cover cracks, or exhaust leaks at the gaskets. Its not uncommon for people to try and mask problems with jetting or air leaks, by turning the PMS out to far.

Have you checked the needle in the slide yet to see if it is a single groove, or a multi groove? Make note of what is above and below the clip on the needle, and if it is a multi groove needle, what groove the clip is in.

If you get the Pilot where it needs to be with the Mikuni 37.5 Pilot, put a 167.5 main(you could probably even run a 170 if you wanted) in and get the needle set right, the bike should perform better. Then you can put the PMS back to about 2 1/4 out, from lightly seated....before it vibrates out, and you lose it.
 
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#1010066
Kaz (User)
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Re:Trying to wrap my head around PO mods 9 Months, 3 Weeks ago  
I'll pick up a 170, install it, and check the needle height next time I pull the carb.(next time it rains)
the AIS has been removed , new intake manifold, no obvious exhaust leaks, and has the dynojet rev master. Thats all I have checked out so far. I figure she is running not too bad for the moment so I think I'll just make up a tinfoil plug to keep the PMS in place. I have found this works great.
 
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