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post #1 of 6 (permalink) Old 06-03-2010, 12:13 PM Thread Starter
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Shims?

Hi, reading through the forum as a newbie, I've had great success with electrical issues and coastering so far. Thanks to everyone!
Now onto something new for me. I'm getting a very slight stutter between 4-5k while cruising steady. Always been there even before the coastering. (EPA crap removed and all lines, rear carb vent plugged.) Idles perfect. Just that slight, not really bothersome stutter but I've read something about the "VN 750 mid range stutter" and I cant find anything else about it but sounds like shimming the needle might help?

It's been recently re-jetted (carbs rebuilt also) to match the V&H pipes and seems to run great otherwise.

Is there a thread that details how to shim (what to shim? What to use for a shim?) and for what result? Looking at my parts diagram, are we talking about the long needle (needle-Jet?)that goes down into the (vaccum Valve?).

98 VN750 A14, 16,500k miles
Coasters plugged
EPA Crap GONE!
Ignition switched REPLACED!
Stator wires soldered
ACCT's Grambo'ed! (1 new)
Degoated
V&H Pipes
Run/Stop Switch reworked/cleaned
Jetted
Smoke Windshield
Padded seat rest extension
Single seat back
Leather bags, tool bag
Kuryakyn Grips
Iridiums
Pick -Ups Modded! (Way too easy to not do!)
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post #2 of 6 (permalink) Old 06-03-2010, 02:37 PM
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Quote:
Originally Posted by crieke View Post
Hi, reading through the forum as a newbie, I've had great success with electrical issues and coastering so far. Thanks to everyone!
Now onto something new for me. I'm getting a very slight stutter between 4-5k while cruising steady. Always been there even before the coastering. (EPA crap removed and all lines, rear carb vent plugged.) Idles perfect. Just that slight, not really bothersome stutter but I've read something about the "VN 750 mid range stutter" and I cant find anything else about it but sounds like shimming the needle might help?

It's been recently re-jetted (carbs rebuilt also) to match the V&H pipes and seems to run great otherwise.

Is there a thread that details how to shim (what to shim? What to use for a shim?) and for what result? Looking at my parts diagram, are we talking about the long needle (needle-Jet?)that goes down into the (vaccum Valve?).
If all you did was install V&H Exhaust there is no need for shims, they wont help you.

If you did an earshave then you will need the shims, what have you done, what jets and how many turns out on the pilot screws.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

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post #3 of 6 (permalink) Old 06-03-2010, 05:02 PM Thread Starter
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Not sure what jets were installed. I had a local kawi dealership rebuild the carbs and jet them to match the pipes that were already on it when I got it, but the bike was running like crap then so I went ahead and had the rebuild. The dealer "said" they ordered the jets needed for the pipes though....

It ran pretty much good like it is now right from then on except for the skip. It is much better than before the rebuild.

Front is about 3 1/2 turns out and the back is right at 4 to get rid of the remaining popping after plugging the coasters. I did do a carb boot leak check but maybe not as thorough as I should have so I will do it again. 4 seems a bit high though huh?

98 VN750 A14, 16,500k miles
Coasters plugged
EPA Crap GONE!
Ignition switched REPLACED!
Stator wires soldered
ACCT's Grambo'ed! (1 new)
Degoated
V&H Pipes
Run/Stop Switch reworked/cleaned
Jetted
Smoke Windshield
Padded seat rest extension
Single seat back
Leather bags, tool bag
Kuryakyn Grips
Iridiums
Pick -Ups Modded! (Way too easy to not do!)
crieke is offline  
 
post #4 of 6 (permalink) Old 06-03-2010, 05:25 PM
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I will be intersted in the results of this thread.

I have a similar thing on my bike with the minor studder. Its just enough to notice like if a wind hits you for just a second at around the same tach 4 to 5rpms. I have not rejetted or backed out the air pilot screws yet (this weekend project plus new screamin' eagle exaust gaskets). Have the jardine cross over exaust. I have blocked off the read valves and carb vaccum line. Did a cleaning on the tank vent but haven't tried the bike yet.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #5 of 6 (permalink) Old 06-03-2010, 06:01 PM
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Quote:
Originally Posted by crieke View Post
Not sure what jets were installed. I had a local kawi dealership rebuild the carbs and jet them to match the pipes that were already on it when I got it, but the bike was running like crap then so I went ahead and had the rebuild. The dealer "said" they ordered the jets needed for the pipes though....

It ran pretty much good like it is now right from then on except for the skip. It is much better than before the rebuild.

Front is about 3 1/2 turns out and the back is right at 4 to get rid of the remaining popping after plugging the coasters. I did do a carb boot leak check but maybe not as thorough as I should have so I will do it again. 4 seems a bit high though huh?
If you are that many turn out they did not jet correctly, you need:

#135 main jets
#40 pilot jets
2 turns out on the pilot screws.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
lance328 is offline  
post #6 of 6 (permalink) Old 06-03-2010, 08:38 PM Thread Starter
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Ok, I'll rejet it myself this time then. Need to learn.

98 VN750 A14, 16,500k miles
Coasters plugged
EPA Crap GONE!
Ignition switched REPLACED!
Stator wires soldered
ACCT's Grambo'ed! (1 new)
Degoated
V&H Pipes
Run/Stop Switch reworked/cleaned
Jetted
Smoke Windshield
Padded seat rest extension
Single seat back
Leather bags, tool bag
Kuryakyn Grips
Iridiums
Pick -Ups Modded! (Way too easy to not do!)
crieke is offline  
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