V111 Tuning Help
Thread Starter
|
Road Master
Joined: May 2018
Posts: 778
Likes: 178
From: Bay Area
V111 Tuning Help
I have a S&S V111 that Im trying to dial in tuning on. It has a Mikuni 45 set up as below. Im at sea level. It seems to run good but people Ive talked with say that pilot seems too small. Ive slowly gone down from the 25 to 22.5 and now the 20 as it kept taking more than 2 full turns out on the air bleed screw which according to the mikuni site means the pilot is too big. It does get random coughs at idle or low throttle sometimes and some popping on decel but it seemed to do the same with the larger pilot jets too. Ive checked intake leaks and its good there. Anyone running a similar set up or have advise on whats worked for this?
175 main20 pilot
97 needle on middle clip
.050 A/P nozzle little to no gap
175 main20 pilot
97 needle on middle clip
.050 A/P nozzle little to no gap
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
I don't know who you are talking to but give the motor what it wants and not what someone thinks it needs.
IMO your random coughs is due to the carb not being rubber mounted to the motor or possibly too too loose. At light cruise you are are getting air bubbles through the main jet which causes the random cough. I went through this on my FXR with a HSR48. Rubber mounting cured 90% of the problems. Do the work first as you'll find it needs re-jetting afterwards. It doesn't have to be real floppy, just a slight movement when you push on the AC. Popping on decel could be better but the bigger HSRs tends to do it more. Adding a little back pressure to the exhaust helps. Any kind of exhaust leak will make it worse.
Add:
With a 111, I'd bet the main jet is too small..
IMO your random coughs is due to the carb not being rubber mounted to the motor or possibly too too loose. At light cruise you are are getting air bubbles through the main jet which causes the random cough. I went through this on my FXR with a HSR48. Rubber mounting cured 90% of the problems. Do the work first as you'll find it needs re-jetting afterwards. It doesn't have to be real floppy, just a slight movement when you push on the AC. Popping on decel could be better but the bigger HSRs tends to do it more. Adding a little back pressure to the exhaust helps. Any kind of exhaust leak will make it worse.
Add:
With a 111, I'd bet the main jet is too small..
Thread Starter
|
Road Master
Joined: May 2018
Posts: 778
Likes: 178
From: Bay Area
I hear yea on peoples opinions, just seemed odd that the larger carb (45) pulling more air would take the same pilot jet size as my old 80 with a 42. Could be apples and oranges but just thought more air means more fuel to balance right and 20 is the second to smallest size they offer
The 111 is in my 91 fxr I bought to ride while I rebuild my 89 fxr that the 131 is in as it was hit by a car last summer.
not sure I understand what rubber mounting the carb means? Is there more than one way to mount the carb? It has the cv style slip fit intake and mounts to the motor on the two head bolts from the air cleaner.
wouldnt slow cruising be using the pilot jet not main? Im planning to try the roll off method test from the mikuni manual to test the main jetting size. It seems to pull hard all the way through but who knows it might be able to pull harder.
The 111 is in my 91 fxr I bought to ride while I rebuild my 89 fxr that the 131 is in as it was hit by a car last summer.
not sure I understand what rubber mounting the carb means? Is there more than one way to mount the carb? It has the cv style slip fit intake and mounts to the motor on the two head bolts from the air cleaner.
wouldnt slow cruising be using the pilot jet not main? Im planning to try the roll off method test from the mikuni manual to test the main jetting size. It seems to pull hard all the way through but who knows it might be able to pull harder.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
I hear yea on peoples opinions, just seemed odd that the larger carb (45) pulling more air would take the same pilot jet size as my old 80 with a 42. Could be apples and oranges but just thought more air means more fuel to balance right and 20 is the second to smallest size they offer
The 111 is in my 91 fxr I bought to ride while I rebuild my 89 fxr that the 131 is in as it was hit by a car last summer.
not sure I understand what rubber mounting the carb means? Is there more than one way to mount the carb? It has the cv style slip fit intake and mounts to the motor on the two head bolts from the air cleaner.
wouldnt slow cruising be using the pilot jet not main? Im planning to try the roll off method test from the mikuni manual to test the main jetting size. It seems to pull hard all the way through but who knows it might be able to pull harder.
The 111 is in my 91 fxr I bought to ride while I rebuild my 89 fxr that the 131 is in as it was hit by a car last summer.
not sure I understand what rubber mounting the carb means? Is there more than one way to mount the carb? It has the cv style slip fit intake and mounts to the motor on the two head bolts from the air cleaner.
wouldnt slow cruising be using the pilot jet not main? Im planning to try the roll off method test from the mikuni manual to test the main jetting size. It seems to pull hard all the way through but who knows it might be able to pull harder.
Anything above idle on a HSR is determined by the needle size. Pilot has some effect but it's mostly needle size up to about 1/4 throttle, after that needle position takes over. Needle size only effects throttle from idle to about 1/4 throttle. After that it's all needle position. If you look at the different sized needles they are all the same except for the diameter of the straight section near the clip. Needle size is really the diameter of that straight portion +2mm . A 97 needle is 2.97mm at that location.
The problem is that the AC is solid mounted to the heads which means the carb is solid mounted to the head. The manifold side is OK It don't look like much but it made a big difference. Look at the picture. You can see the grommet. It don't look like much but it cured the main issue I was having.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,025
Likes: 7,549
From: Poolville
My 89"er stroker Evo with an hsr 42 was a 22.5 /190 I imagine that 111 is going to want a lot more fuel.. Another thing that could be causing the popping on D cell is that's a big motor, 111" and if riding it down in gear it's going to suck fuel through that carb as well which will cause the popping.. Especially at higher RPMs...
Thread
Thread Starter
Forum
Replies
Last Post
