trochoid

iTrader: (6)

Not really slacking, don't have an answer for you. The Mikunis I have don't have a vacuum port, so I don't have the advance hooked up. The DHLA I have has no port either. The progression holes are for tuning in smoother transitions when going from the idle to the main circuits.

Rogue_Wulff

I did point out earlier that many sidedraft carbs never had the port for the vac advance, due to their original design as a racing component.
I even when as far as to say "Once (or if) you find" the port needed......

dbragg

iTrader: (7)

well now i got the carb installed but the damn thing wont start! ugghh!! it sputters and backfired once, but thats it. its getting fuel, spark, air. the timing is right. i cant tell unless the engine will start. dammit

trochoid

iTrader: (6)

Clean your plugs and add a capfull of oil down each primary barrel. Installing these aftermarket carbs often lead to flooding when 1st trying to start them up until the fuel pressure gets set.

Sorry if I stepped on any toes, I probably missed what you posted, but you're right. Most of the 'race' carbs don't have provisions for vac advance.

dbragg

iTrader: (7)

i poured a cap full of MMO down the primarys and changed the plugs. nothing. wont turn over but back fires a little. i have to go to sleep now for work tonight, 3rd shift. ill have to barrow the parents jeep wrangler to drive....uugghh. i hate that thing. tomorrow ill check the timing. thats the only other place i know to look.

1badFB

iTrader: (1)

I never knew that your vacuum advance had to be plumbed in above the throttle plates...

Is there even such a provision on a nikki????
I was sure you just hooked them up to manifold vacuum... isnt that what the emissions removal tutorial says???

Im really confused here....on a stock engine/carb where would the vacuum advances vacuum be drawn from??

trochoid

iTrader: (6)

Vacuum advance on the Nikkis is connected to the phenolic spacer plate between the carb and intake. From that port, there are passage ways through the carb that open into the throats where the highest vacuum is pulled, right next to the butterflys, iirc.

Rogue_Wulff

Correct, the port in the spacer goes up, where it meets a coresponding hole in the carb base. If I remember correctly, it's the second port on the spacer (from the front).

Didn't step on mine, I was mearly reminding everyone I had already stated the facts. Sad as they are.