Anyone running a 36 intermediate?

[Moespeeds]

I'm running what basically amounts to an open intake. The bike has been running ok, but I wanted to play with the carb a little. I jetted the bike almost 2 years ago, and don't even remember what I did. I've had the carb vent screw in there, but last night I took it out. Now I've got what I'm thinking is a lean condition on the intermediate. At up to about half throttle the engine is bucking, but if I twist it wide open it goes. I'm assuming the the shot from the accel pump and the main coming online are dumping gas in there and getting it going again. When I opened the carb, I had a 33 intermediate in there. The largest jet I have laying around is a 36, so I put it in. I have yet to ride it because of course it started raining here. So I guess with all this rambling my question is, is anyone running this large of an int jet? Remember my intake is open, and my pipes are grumpys which are only about 14" long. I'm getting around 40 MPG city and 45 on long trips.

 

[alhall88]

Don't overlook your airbleed. You can get different results by changing out the air bleed as well. Smaller air bleed will cause the main jet to come on earlier, larger jet will cause the main to come on later. You can also buy a 34 and 35 int. jet from zippers if needed. I'm running a 33 but I only run a 76 main because I have a thunderjet installed with an external 55 air bleed. Most of the stock G carbs have a 40 airbleed as well.

 

[Moespeeds]

Well I just took it out and its running even worse. It feels lean but considering that I went up on the int and it got worse I'm gonna try leaner. By yanking that bowl vent plug, what have I done? Will I run leaner without it?

 

[Moespeeds]

Went down to a 31 int and I'm getting decent low RPM cruise. For the high I've gone all the way up to an 82 and I still feel like I need more. From low rpms if I jump on the gas once the shot from the accel pump burns off it's a stuttering mess. With the accel pump off altogether it doesn't want to accelerate off midrange. Before I took out the vent screw I was running 33/78 and the bike went ok, but was breaking up up top. I know I can not get it perfect because my air cleaner blows and I have short short pipes. They say you need to take the vent screw out for open air cleaners but my situation seems to have gotten much worse for taking it out. Any thoughts? I don't have a tach so this is a little tricky.

 

[Staffy]

Moe, am experiencing a similar issue with my Mastiff, running a RSD Velocity Stack, and hooker pipes. Have a modified Tripple X carb. Have had some GREAT exchanges with Bob from Tripple X carbs, (who is beyond knowledgeable) – all roads lead to the AIR BLEED…..read attached… (My issue - engine seems to be running rough, like there's not enough "juice". Next when transitioning from int-to-main the bike chokes/bogs down...upped the jets still no real difference - here's why...) have ordered the new jets for the AIR BLEED, will let you know how it goes...

From BOB @ Tripple X
Since this is a carb without Thunder Jets it's possible it could use larger jetting due to the open velocity stack. I've been putting in .032 intermediates, .078 mains and .066 air bleeds now on all the Big Dog 117" motors with standard air cleaners. The fuel mix must have changed over the last year or so because the carbs are responding better with larger air bleeds these days. The larger air bleed delays the main jet from kicking in until a later RPM which in turn leans out and smooths out the transition range. The transition range is usually from 2500 to 3500 RPM.
When you say a "choke effect" is that the same as a bog or big loss of power? Does it eventually get past this range and smooth out after wards? If so it sounds like the air bleed is too small causing the fuel mix to go too rich. Going bigger on jetting as is won't help and might make it worse. It's not popping back thru the carb is it? Popping thru the carb is usually a lean condition. Engine bogging is usually a rich condition.
With lots of air flow through the carb the Booster sounds like it might be reacting too soon which would make it rich in the mid range. I think I might have put in the smaller .052 air bleed when we did your carb thinking it might need a quicker main jet response due to the velocity stack. The larger air bleed should help if its a bog your getting and not popping through the carb. Go to a .066 or .068 air bleed and try it. These sizes should be available locally since they are close to main jet sizes.
I assume the engine runs okay at idle and slightly above? How many turns out is the idle mix screw when adjusted for a smooth idle? About 1-1/2 to 2 turns out is average. The idle mixture should be set right first because it can effect engine acceleration.
If engine starts and runs okay at slow speeds, idle and slightly above then the ignition timing should be okay. Did you make a lot of engine changes before starting it up?
Let me know how it goes
Bob
TRIPLE X CARBURETORS

 

[T.Byrd]

Moe Im running a xxx super G with a wimmer dual runner breather and im running a 33 inter. and a 78 main with the vent plug out. I took a 5/8 bolt and drilled a hole in it and made my own barbed fitting and screwed it into where the plug was and ran a tube from it. This keeps the discoloring off the carb.

 

[Bulldog03]

all roads lead to the AIR BLEED…..read attached… (My issue - engine seems to be running rough, like there's not enough "juice". Next when transitioning from int-to-main the bike chokes/bogs down...upped the jets still no real difference - here's why...) have ordered the new jets for the AIR BLEED, will let you know how it goes...

From BOB @ Tripple X
Since this is a carb without Thunder Jets it's possible it could use larger jetting due to the open velocity stack. I've been putting in .032 intermediates, .078 mains and .066 air bleeds now on all the Big Dog 117" motors with standard air cleaners. The fuel mix must have changed over the last year or so because the carbs are responding better with larger air bleeds these days. The larger air bleed delays the main jet from kicking in until a later RPM which in turn leans out and smooths out the transition range. The transition range is usually from 2500 to 3500 RPM.
When you say a "choke effect" is that the same as a bog or big loss of power? Does it eventually get past this range and smooth out after wards? If so it sounds like the air bleed is too small causing the fuel mix to go too rich. Going bigger on jetting as is won't help and might make it worse. It's not popping back thru the carb is it? Popping thru the carb is usually a lean condition. Engine bogging is usually a rich condition.
With lots of air flow through the carb the Booster sounds like it might be reacting too soon which would make it rich in the mid range. I think I might have put in the smaller .052 air bleed when we did your carb thinking it might need a quicker main jet response due to the velocity stack. The larger air bleed should help if its a bog your getting and not popping through the carb. Go to a .066 or .068 air bleed and try it. These sizes should be available locally since they are close to main jet sizes.
I assume the engine runs okay at idle and slightly above? How many turns out is the idle mix screw when adjusted for a smooth idle? About 1-1/2 to 2 turns out is average. The idle mixture should be set right first because it can effect engine acceleration.
If engine starts and runs okay at slow speeds, idle and slightly above then the ignition timing should be okay. Did you make a lot of engine changes before starting it up?
Let me know how it goes
Bob
TRIPLE X CARBURETORS

Sounds like some good info, I am running a 36 int. and a 80 main, with a 76 air bleed...started with a 48,52,58,66,72,74 and ended with a 76 air, transition is perfect I also went with an 80 main to bring it in a little later, so the 36 carries it to the 80, tried a 33 but there's the stumble at the transition....I got the XXX G with Thunder jet with a 105 size jet to bring that in a little early with the main, this works for me and my setup so I don't know if it'll work for anybody else....