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Carbs and Fuel System
From the gas tank to the carbs
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  Topic Review (Newest First)
07-31-2018 12:32 AM
roadpouring Hunted around and found one of these, placed a tiny 3" zip tie a half inch from one end to stop the hole, slip the other end 3/4" on my carb bowl vent hose and secured it with another zip tie.
The hose is pointed to the rear and secured to the wiring harness just behind the thermostat and under the fuel tank.

You could cut a circle out of posterboard, gasket material or plastic and glue it to one end to give the filter more breathing area and also look more 'manufactured'(of course no one is gonna' see it anyway).

This material breathes like nothing is there but should keep the dirt-dobbers and other unwanteds out.

https://www.ebay.com/itm/5-pack-Pola...LH_TitleDesc=0

You can likely get just one at a local swimming pool supply store.
07-21-2018 08:08 AM
roadpouring
Quote:
Originally Posted by JETHRO View Post
well, changed the main jets today, back now with a 40/140 set up with one shim ,will see how it goes ,was running ok before on 40/138 but could not get the plugs a nice colour ,was a whiter shade of pale with the screws adjusted right out so should be better, will probably have to screw mixture right in next time as on three turns out now.
I'm running with 40/140 no shim now and it seems to be just right.
I'll know better over some time.

Thanks for your input, Jethro!
07-21-2018 07:43 AM
JETHRO well, changed the main jets today, back now with a 40/140 set up with one shim ,will see how it goes ,was running ok before on 40/138 but could not get the plugs a nice colour ,was a whiter shade of pale with the screws adjusted right out so should be better, will probably have to screw mixture right in next time as on three turns out now.
07-15-2018 12:00 PM
roadpouring
Quote:
Originally Posted by JETHRO View Post
I live at 200ft above sea level and for me the 40/140 were best, It was just the hot start problem which made me alter set up ,There is a noticeable change in power from 140 to 138 so I am going back to 40/140, just a nicer ride .
I used to have a problem with hot starts when I restricted myself to the recommended choke-only start.

Then I found that by leaving the choke alone and just barely twisting the throttle a fraction, it starts right up every time no matter what jets I have at the time.
07-14-2018 08:10 PM
roadpouring Just got done putting in the 40 pilots and 140 mains... no shims.

Now let's see, how many carb R&Rs has this been? It's a blur to me but I'll count 'em later, some time.

Took no more than two hours, again. Just startin' to get good at it, but I may be done with it for now. With re-jetting... I hope so.

We'll see when I do the next test drive.


Thanks for all the feed-back. You guys have been a tremendous help.


I'll write more later.


Edit: So I just counted 5 times carb R&R including the first carb cleaning, in th' last couple of months.

Hopefully, I've found the happy middle.
07-14-2018 05:51 PM
michiganteddybear my setup was stock jetting, no shims (unless they where already there, I dont remember), and also sea level.. same battery and pickup coil mod.

was ear shaved, using pk-92's, stock exhaust
07-14-2018 01:05 PM
ubertalldude Shims bring a richer fuel mixture on earlier in the rev range by advancing the needle slightly. It doesn't richen the pilot or mains, just richens the needle section of the rev range, potentially giving a bit more low-mid torque once you roll onto the throttle slightly.

Hard for anybody to prescribe a tune for you, unfortunately, so you can fiddle around. Luckily you can pretty easily access the needles and insert shims just by removing the gas tank, rather than removing the carbs.

I live in FL (sea level) and run 135/38 with 1 shim. Cold start no problem, idle is solid, hot start no problem (note that I also have an AGM battery and have done the pickup coil mod, so those help a lot too) and the engine runs well. I've never read the plugs, don't feel the need to with how well it tuns once warmed up.
07-14-2018 09:55 AM
Spockster
Quote:
Originally Posted by roadpouring View Post

What do you mean by R&R? I understand the term in certain contexts but I don't know what you mean, here.

Thanks
R&R - Remove and Replace
07-14-2018 06:55 AM
JETHRO I live at 200ft above sea level and for me the 40/140 were best, It was just the hot start problem which made me alter set up ,There is a noticeable change in power from 140 to 138 so I am going back to 40/140, just a nicer ride .
07-14-2018 12:30 AM
roadpouring
Quote:
Originally Posted by Spockster View Post
Nice list. The way OEM should've done it, would like to do this on mine. Should be able to use a flex drive with the ball-end to R&R them.

Could sell them as kits.
Yeah, a flex drive would work, too.
However, the straight shank 3mm hex ball end with 25 degree lateral movement encounters no obstacles.
It works flawlessly, but... each to his own in one's choice of tools.

What do you mean by R&R? I understand the term in certain contexts but I don't know what you mean, here.

Thanks
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