Doof Clenas Forum & Collective


Go Back   The Doof Clenas Motorcycle Collective > Tech Talk > Carburetor
CHALLENGE COINS, PATCHES, TIMER COVERS, HATS, T-SHIRTS IN STOCK NOW - Click on the "Doof Wares" link on the menu bar... ------------------------------ Current Homeland Diaper Rash Level: Light Pink - Chafed, yet faintly amusing ------------------------------ Lady G's Doofishul Theme for August is: Redheads ------------------------------ LISTEN TO OUR NOT QUITE FINISHED THEME SONG... CLICK HERE!... THANKS, BUZZ!!!!

Reply
 
Thread Tools Display Modes
  #1  
Old 03-23-2009, 10:08 AM
fxr4mikey's Avatar
fxr4mikey fxr4mikey is offline
Buffalo Hump
 
Join Date: Oct 2007
Location: Columbia, South Carolina
Posts: 12,549
Rep Power: 212266
fxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suck
Installing/Tuning Mikuni HSR42 on my 1340 EVO - FXR4

So I finished my build, and part of that was installing the Mikuni HSR42

I didn't remember reading this on the Mikuni site, but they do have a item there that describes that 'some FXR's' MAY have a fitment issue with the control arm ... more on this in a minute.

So I installed it, last part of the build. I didn't notice any fit issue. However the bike wasn't running the best, so with some help from friends, and the good folks here, I determined that the bike was running to lean. So I bought a new idle jet and jet needle. Both one size 'richer' than what comes standard in the carb. The carb comes with a 25 idle jet and a -97 jet neddle, I bought a 27.5 idle jet and a -96 jet needle.

When I took the carb off the bike I thought, DAYUM, I'm lucky it was running good, this would have been a pretty big problem at some time in the future. The top of the carb had been rubbing on the end of the control arm bracket that is welded to the bottom of the back bone. This is the bracket that holds the top hemi joint (control arm) that is bolted to the bracket that is bolted onto the tops of the heads on the left side. Also the vacum port had been rubbing on the head of that bolt that holds the control arm in the bracket, just above the carb.

Here's the pics of this..
you see the damage to the top of the carb, and if you look at the top left of the vac port, you see the damage there too



here's a pic showing the bracket, and wear from the carb. No doubt the carb (being alum) would wear out long before this steel bracket





I was reminded by my Good Friend Harley, that Mikuni talks about this on their website ... so off I went, and here's what they say:

4.Carburetor hits tank or upper motor control arm

There are several possible reasons for this:

1: The manifold is out of position and is pointing "up" toward the tank. This is the most common cause of interference between the Mikuni HSR and the cycle's fuel tank. One clue that this is the case is that the air cleaner bolt holes do not line up with the bolt holes in the heads. Since many air cleaners have some slack in their installation, this is not always a definitive way to check manifold alignment. An angle gauge such as those made for home use can be used to check the alignment of the manifold's mouth.

Use the gauge to compare the angle across the mouth of the intake manifold with the front surface of the points cover or with the seating surfaces of the head breather bolts. The mouth of the carburetor should be parallel with the any of these surfaces.

If the mouth of the manifold is not parallel, loosen the manifold bolts and rotate it until it is.

NOTE: It is a good idea to lubricate the manifold seals as you do this. There is a tendency towards air leaks if the manifold is rotated in the manifold/head seals without some lubrication. WD-40 is convenient and effective. Always check for air leaks after moving the manifold.

2: Some FXR/FLHT frames have the upper lateral control arm mount (this is the folded sheet metal arm that is welded to the frame's backbone just above the carburetor) located slightly low. This can result in interference between the lateral link's mounting bolt and the top of the carburetor. Occasionally, the arm can be so low that it directly hits the top of the HSR Mikuni.

A shorter bolt (Harley fits either of two bolt lengths) or a "button" head bolt mounted with the head down often cures the clearance problem. If it is the arm itself that strikes the top of the carburetor, you may have to consider modifying the arm.



so for me, it was
1) the bracket itself hits the top of the carb
2) the head of the bolt hits the vacuum port

so, I needed to fix it .... I decided to modify the bracket by cutting the back corner of it off to provide clearance for the top of the carb ... here's yur pics
first thing I did was put tape over the intake, and then taped the shop vac hose in place and turned it on. I wanted the shop vac to suck up as much of the cuttings as possible, and didn't want any of it going into the intake. You can't see the shop vac hose, it's just outside the left of the pic, taped up next to the rocker box.





after I cut the piece out, I put the grinding wheel on the dremel and rounded everything over smooth



then I checked the fit ..... sometimes things just don't show in the pics the way they really are ... maybe I didn't have the carb fully seated in the intake, but the fit is 'good' the top of the carb is 'clear' but it's a bit tighter than what shows in this pic




So then I had my new jets installed, and put it back together, warmed it up .... took her out for 15 miles RUNS GREAT !!!!!!!!!!!!!


I still have a problem where that vacuum port hits the head of that bolt on the control arm. I have to take the carb back off, take that vac port off the carb, put some teflon tape on it and put it back in. I need to get it pointed left or down, which will also require a slilghtly longer vacuum line ..... or I can try to find a button head bolt to run thru there. Either way, the carb has to come back off no long rides until that's fixed. It wears a hole in the vacuum line, which operates the VOES and the fuel petcock ........ can't let that loose vacuum ....
__________________
Her badonkadonk ........ nuff said !!!





States I've ridden my scoots in:

Reply With Quote
  #2  
Old 03-23-2009, 11:46 AM
Scabbydoo's Avatar
Scabbydoo Scabbydoo is offline
Double-D
 
Join Date: Feb 2007
Location: Not far from the Liberty Bell
Posts: 31,800
Rep Power: 208926
Scabbydoo can happily embrace the suckScabbydoo can happily embrace the suckScabbydoo can happily embrace the suckScabbydoo can happily embrace the suckScabbydoo can happily embrace the suckScabbydoo can happily embrace the suckScabbydoo can happily embrace the suckScabbydoo can happily embrace the suckScabbydoo can happily embrace the suckScabbydoo can happily embrace the suckScabbydoo can happily embrace the suck
Well done Mikey. Think I'd go for the button head over trying to mess with the vacuum fitting.
__________________
Tom

"Age is a case of mind over matter. If you don't mind, it don't matter."...Satchel Paige

"Mother Nature may dictate I grow older but there ain't nothin' nor nobody can make me grow up." ..Me



Reply With Quote
  #3  
Old 03-23-2009, 11:48 AM
Woody218
Guest
 
Posts: n/a
Should have bought a Twin Cam instead of that antiquated piece of crap!
Reply With Quote
  #4  
Old 03-23-2009, 11:49 AM
Geezer-Glide's Avatar
Geezer-Glide Geezer-Glide is offline
Amsoil Site Sponsor
Double-D
 
Join Date: Feb 2007
Location: Licensed to run amok.
Age: 66
Posts: 14,174
Rep Power: 265518
Geezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever know
Rub some dirt on it..........


__________________
.
.



Meng

TKWSV





Reply With Quote
  #5  
Old 03-23-2009, 11:54 AM
Geezer-Glide's Avatar
Geezer-Glide Geezer-Glide is offline
Amsoil Site Sponsor
Double-D
 
Join Date: Feb 2007
Location: Licensed to run amok.
Age: 66
Posts: 14,174
Rep Power: 265518
Geezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever knowGeezer-Glide has forgotten more about Harleys than you'll ever know
Quote:
Originally Posted by Woody218 View Post
Should have bought a Twin Cam instead of that antiquated piece of crap!
OUCH!!
__________________
.
.



Meng

TKWSV





Reply With Quote
  #6  
Old 04-10-2009, 02:12 PM
fxr4mikey's Avatar
fxr4mikey fxr4mikey is offline
Buffalo Hump
 
Join Date: Oct 2007
Location: Columbia, South Carolina
Posts: 12,549
Rep Power: 212266
fxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suck
OK, I haven't been here in awhile.

Here's the rest of the story......

the vaccum port on the carb was hitting the bolt head that goes through the top motor mount bracket

here:



so I changed that bolt out with a button head (allen) bolt.... should be nothing to wear a hole in vacuum line now.....

__________________
Her badonkadonk ........ nuff said !!!





States I've ridden my scoots in:

Reply With Quote
  #7  
Old 04-10-2009, 02:13 PM
fxr4mikey's Avatar
fxr4mikey fxr4mikey is offline
Buffalo Hump
 
Join Date: Oct 2007
Location: Columbia, South Carolina
Posts: 12,549
Rep Power: 212266
fxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suck
Quote:
Originally Posted by Woody218 View Post
Should have bought a Twin Cam instead of that antiquated piece of crap!
I love you man ................ sometime 'brothers' are a PITA










__________________
Her badonkadonk ........ nuff said !!!





States I've ridden my scoots in:

Reply With Quote
  #8  
Old 04-10-2009, 02:14 PM
fxr4mikey's Avatar
fxr4mikey fxr4mikey is offline
Buffalo Hump
 
Join Date: Oct 2007
Location: Columbia, South Carolina
Posts: 12,549
Rep Power: 212266
fxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suck
Quote:
Originally Posted by Geezer-Glide View Post
OUCH!!
seeee, that even hurt you didn't it







y does he treat me like DIRT !!!
__________________
Her badonkadonk ........ nuff said !!!





States I've ridden my scoots in:

Reply With Quote
  #9  
Old 04-10-2009, 02:18 PM
fxr4mikey's Avatar
fxr4mikey fxr4mikey is offline
Buffalo Hump
 
Join Date: Oct 2007
Location: Columbia, South Carolina
Posts: 12,549
Rep Power: 212266
fxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suckfxr4mikey can happily embrace the suck
also, on the Mikuni, the choke comes under the tank on from the other side of the carb than where it waz with the stock CV carb.

So in order to mount the enricher cable you had to put a pretty tight lil 'S' bend in it. I didn't like that cause I couldn't always be sure that the enricher was fully seated in the carb when pushed in.

so on the coil mounting bracket where the knob mounts, on the left side of it, there was a 'hole' .... so I thought that I'd just cut the top of the hole out, make it a 'U' and mount the enricher knob there.

Then I could just pass the cable straight though with no 'S' bend.

here's my handy work:



__________________
Her badonkadonk ........ nuff said !!!





States I've ridden my scoots in:

Reply With Quote
  #10  
Old 04-10-2009, 02:44 PM
SafetyMan's Avatar
SafetyMan SafetyMan is offline
RAM 1500 4X4 CC
 
Join Date: Jul 2007
Location: Cibolo, TX
Last Cigar Smoked: Man O' War Ruination
Age: 49
Posts: 29,542
Rep Power: 411636
SafetyMan has forgotten more about Harleys than you'll ever knowSafetyMan has forgotten more about Harleys than you'll ever knowSafetyMan has forgotten more about Harleys than you'll ever knowSafetyMan has forgotten more about Harleys than you'll ever knowSafetyMan has forgotten more about Harleys than you'll ever knowSafetyMan has forgotten more about Harleys than you'll ever knowSafetyMan has forgotten more about Harleys than you'll ever knowSafetyMan has forgotten more about Harleys than you'll ever knowSafetyMan has forgotten more about Harleys than you'll ever knowSafetyMan has forgotten more about Harleys than you'll ever knowSafetyMan has forgotten more about Harleys than you'll ever know
I would get some paint on that control arm where you cut it off. I don't thin I'd spend a ton of money on HD paint, but some gloss black Rustoleum and a small disposable hobby brush ought to fix you right up.

If you bring it here next month, I can hook you up.

Will serve 2 purposes...

A. Protect the steel from rust.

43. Dress it up so's it don't look like cold ass.




Nice work!
__________________
Hi, my name is Chip, and I am a Poser.
Frac Rat ~ Stimulator of Holes
ΜΟΛΩΝ ΛΑΒΕ
From my Brother Don... I love his insight.
Quote:
Originally Posted by RoadWolf View Post
Postwhores are a dime a dozen.
What's impressive about you is that you are your own pimp.
Kudos!

....................


Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
WTB Mikuni Geezer-Glide Item Wanted 0 02-08-2011 06:29 PM
The Orange Crush Dyno Run: 80" FXR4 w-W6, Mik42, SE Heads, Cometic .030 HG, and V&H Straight Shots fxr4mikey General Bike Discussions 33 08-14-2009 05:27 PM
put this on with my new mikuni ? fxr4mikey Carburetor 6 08-30-2008 09:35 PM
FXR4 Stock exhaust system fxr4mikey Classifieds 5 08-08-2008 11:43 AM
FS:Mikuni 42 dippsy dumbass Classifieds 3 05-03-2008 10:43 AM


All times are GMT -5. The time now is 05:30 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright ©2006 - 2016 doofclenas.com, LLC
The Doof Clenas 43 logo is a registered trademark of doofclenas.com, LLC
Doof Clenas Forum & Collective