I had the jetting nailed on my 1915 that went bye-bye. I think I ran F7 tubes with .120 fuel, .165 air jets & I think 50 idle jets. This was a set of 44's . This is an 8 year old memory. Does that sound about right??

I have a set of 40's to use on my other 1915 that runs a little less compression & a milder cam. Whats a good starting point for the smaller carbs on the milder engine?

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start with whatever u got and see if it works,,,i would go up a little on the mains,about 150 and the pump jet should be a 0 instead of a .50,,,,,its the jet in the bottom of a weber

try .115 fuels , .145airs and .50 on the idles should be fine but maybe a .45,oh for a 1915 f11 tubes work better just my thought

I whith Chris start a littel big & go down . I had a 2165 that ran good had f11 tu 50 id 170 ma 195 air that is a big ma my 2387 has f11tu 55 id 155 ma 195 air 2332 f11 50 id 155ma 200air 1915 f11 50 id 145ma 200 air

thats fine but he said the compression is lower than 10.0 and has a mild cam and probaly little heads so no big jets needed

Good to know my memory is still solid. I think the 40's have f11 tubes. Ill stick with em. I was going to start with .115 fuel & .150 air with 45 idles. Seems to be pretty close to your suggestions.

Chris, The jets are out of the carbs so Im starting from scratch. Youre spot on with the 150's. Ill dial in the fuel jet up or down according to the plug readings. I think you confused the pump jet with idle. I think 0 comes stock. I was referring to thr idles at the front outside of the carb being 50's. I dont think you need to increase the pump jet unless you have a bad stumble off idle that wont go away. Sorta like changing the pump cam on a Holley.

I think Ill try 3" stacks inside my 6" filters due to the mild cam. I cut 6 inchers down to 4 1/2" on my other engine & it really smoothed out the high rpm's.

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Play with the stacks taller make more TQ but they say you need 30mm to the top of air cleaner for good flow

its really called the pump bypass jet,and its usally a .55,,,if u change it to a 0 it will give u a ton of throttle response,u will thank me later,,lol,,look on aircooled.net they sell them,,,u can probally go up to a 180 or 200 on ur mains and it will be a screamer,,,never a 115 main,thats a stock 1500cc motor,,,also u can drill ur squiters out to about .065,,,.050 is factory,i think,dont go any bigger on duals,if it was a single u could,,if u need any help or some main jets just to try i will ship u some and try them and u can ship me ur old ones i can drill them out,i wont charge u nothing jus give me ur old ones,,i love messing with webers,pm me if u need sumthing

what are you talking about changeing to 0

pump bypass jet,,,look it up on aircooled.net,,,its for when u presss the throtle,on a factory weber,part of the gas will go to the squirters, the other part will go to the bowl,if u change to a 0,,,all will go to the squirters,its a cheap upgrade to a weber that works awesome

I cant find the tech article but I wanted to make sure Im referencing the same jet.

This is the only Weber jet I know of thats a size 0. Is that the one you are talking about? I do know its changed to tune out a stumble but I thought it started at 0 & went up. Ive never had to mess with it & Im not even sure where it is in the carb.

Ive never been able to go past a 160 fuel even on a single without fouling plugs. The reason I was going to start at 115 was to account for the .440 lift cam. I didnt put it in there & its kinda weak but I dont want to tear it down to swap it.

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that is the jet chris is talking about ......but i thought you had to change it to 0 when running a single carb?

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Just Stand On It!!!!

Chris

thats the jet,inside carb on the bottom,it comes as a 55,,change it to a 0,its not nessacery,jus a really good upgrade,and they work great in duals,they do in mine