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Carburetor Specifications (Read 4637 times)
buster6315
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Re: Carburetor Specifications
Reply #30 - 09/13/21 at 18:57:42
 
verslagen1 wrote on 09/13/21 at 17:40:46:
buster6315 wrote on 09/13/21 at 16:27:48:
I've got some #4 washers.  Now I have to remove the gas tank:  I've disconnected the fuel line and the vacuum line, and the speedometer cable.  I can pull it towards the rear, but not enough.  Any suggestions?  Thank you! Sad


If you have access to the top of the carb and you only want to change the white spacer, you don't need to remove the carb.  Just take the top off.

But, to answer your question... the bowl is hitting the bat box?  The bat box can be pulled back a little and that may be enough.

Take a ratchet strap and hook one on the upper shock stud around the bat box and to the axle, or some other place convenient.  Tighten it up a little till you got room for the carb to come back a little.  Of course I'm assuming you've removed the rubber duckie.
 I am not trying to remove the carb; the gas tank is the problem.  I wiggled it enough to remove it.  I pulled the top off the carb and replaced the stock white washer with a single plastic washer.  The #4 metal washers were too large.  I cut down the plastic one to make it fit.  I went from ~3.5/32" to 1.5/32" thick.  Hopefully that will cure the surging issue.  Thank you.
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wiguzziman
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Re: Carburetor Specifications
Reply #31 - 09/14/21 at 12:33:36
 
I had the same issue the first time I removed my gas tank.  It would slide to the rear about 1" and then acted like it was hitting something.  I found that if you hold pressure on the rear of the tank pushing to the left it will clear whatever it bumps into.  Then it's just a matter of lifting the tank off rear first.  wiguzziman
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buster6315
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Re: Carburetor Specifications
Reply #32 - 09/14/21 at 19:51:23
 
Yes, that is how I was able to remove my gas tank also.  Installing it was a hassle because I did not make note of the speedometer cable routing:  Ended being too short the first time, so, off came the tank again!  Got the speedometer cable routed properly (second attempt) so it was long enough to be threaded onto the tranny connector.  Of course the rubber gasket fell down near the starter, so that had to be fished out.  Bottom line, the carb mod cured the surging issue.  Me happy now!  I may check the mpg some time.  Next project is to install longer handlebars.
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Suzuki86prince
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Re: Carburetor Specifications
Reply #33 - 10/26/22 at 12:38:58
 
Hi, I have a quick question for the first post. The carb spec chart. I have a 86 in Canada. Is there a different carb spec list for a Canadian 86 or would they be the same at the time (1986)
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Re: Carburetor Specifications
Reply #34 - 10/26/22 at 14:20:59
 
Suzuki86prince wrote on 10/26/22 at 12:38:58:
Hi, I have a quick question for the first post. The carb spec chart. I have a 86 in Canada. Is there a different carb spec list for a Canadian 86 or would they be the same at the time (1986)

The copy of the FSM is in english and does not explain the areas/countries that the data pertains to.
The abbreviation for california is CA and that happens to coincide with the abbreviation for canada.
However, calif. has always had its own EPA requirements so I think that the specs listed in the FSM are mainly for the USA.
It should also be  noted that units of measure in the USA are inch/lb/sec
Whereas the rest of the world uses metric units, m/gram/sec
This may seem meaningless trivia but for the jets as they are numbered differently.
And heaven help you if you find Dynajet jets in there as their numbers are different from everyone.

So if you see the devil walk by with a handbag, you might ask if he's got the manual for canada.
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Suzuki86prince
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Re: Carburetor Specifications
Reply #35 - 10/26/22 at 18:18:09
 
Ok, we’ll thanks for clearing that up for me anyways.
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Re: Carburetor Specifications
Reply #36 - 04/21/23 at 15:07:20
 
I'm back to riding my LS650 after 10 years,
My vehicle's engine gave up on me ...

This is so helpful, I was working on cleaning up my carb, some of the screws slipped so now I'm into getting the right screws.

I also found at Home Depot Hillman's stainless steel

Top Cover
M5-0.80 x 16

Float Cover (Bottom)
M5-0.80 x 12

Side Cover 3 Screws (TEV Cover)
M4-.70 x 10

verslagen1 wrote on 07/19/14 at 22:16:40:
Todd James wrote on 07/19/14 at 22:08:55:
I replaced all of the external screws on my carburetor
with Allen head screws.
Here's a picture that shows the location, sizes, and
quantities of the screws.


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Re: Carburetor Specifications
Reply #37 - 04/23/24 at 06:31:22
 
This good old post needs a bump.

I bought a cheap rebuild kit on E.Bay.  I knew many of the parts wouldn’t be ideal or correct, but I mostly just needed the float bowl gasket and to study the other parts.  

After some messaging with the seller, here’s a list of specs for the components.  My notes/questions included.

1 Float Bowl Gasket (actually good quality)

1 Viton Tip Needle & Seat #2.8 (This is the float valve - is 2.8 big enough, there’s no mention of this in posts/thread above.  I know the Mikuni VM36 uses a 3.4.  I don’t know if these numbers are flow rates or mm sized.)

1 Main Jet #130 (Way too small.  Advised seller to talk to his supplier to include a 145 with extra 147.5 and 150. The extra larger jets would be a nice marketing plus for the kit.)

1 Main Jet #70 (I believe this is misnamed and should say ‘pilot air jet’.  It’s the same physical size as the Pilot Air Jet that should be 67.5.  What would be the affect of 70 vs 67.5?)

1 Pilot Jet #47.5 (Advised seller this should be 52.5 for more current models and only older models used 47.5 - suggested including a 47.5, 50, and 52.5 in the kit for better marketability.)

1 Needle Jet (seems to match stock, good quality)

1 Needle #Y379S (Has 3 grooves, but what about the taper?  This will be interesting and fun to dial in. What the heck is a “Y379S”?.)

1 Needle Clip (The inside diameter is too large to fit securely in the needle groove.  I had to pinch and manipulate it with needle nose pliers to crimp it snug and tight in the groove.)

1 Fuel Mixture Screw (seems good quality and the tip was protected with a plastic cover)

1 Fuel Mixture Screw Spring (seems fine)
1 O-Ring (seems fine)
1 Washer (seems fine)

I have an authentic Mikuni 150 Main and 52.5 Pilot jet coming from JetsRUs.
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ThumperPaul
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Re: Carburetor Specifications
Reply #38 - 06/12/24 at 05:20:11
 
Looking over the original post, it’s interesting that the common USA set up uses a 52.5 pilot at 3 turns out and the CA version has a 47.5 at 1-3/4 turns out.

I understand that CA has stricter emission laws, but if you can achieve good idle with a 47.5 at 1-3/4 turns out, why install the bigger 52.5 at 3 turns out for common USA models (pilot air jets being equal)?  I suppose the bigger jet provides slightly better richer acceleration transitioning on to the needle/jet needle.

Heck, just start with a 50 at 2 turns out and tinker from there….

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