please help
Thread Starter
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6th Gear
Joined: Jun 2019
Posts: 10
Likes: 1
From: Wv
please help
I have a 1987 sportster bored to a 1200, s&s super e carb, and alot of motor work done to it. Anyway I installed a Velocity intake on the carb it's a straight tunnel with no filter. Well stupid me i left the ball in the intake when i went to start the bike. When the bike turned over straight gas shot out of the exhaust before i realized i left the ball in the intake, also when the bike turned over i was standing on the right side of the bike and i felt a puff of air hit my leg. After i took the ball out of the velocity the bike started like it was flooded and after a minute it idled fine and started fine. when the gas came out of the exhaust it sounded like the bike turned over faster then usual. When i ran the bike down the road it was hesitant until it warmed up more and im not sure if its from the colder air being sucked straight into the velocity intake or if i messed something up. My question is is there anything i need to worry about since gas shot out of the exhaust?
HDF Community Team
Joined: Mar 2017
Posts: 7,860
Likes: 4,420
From: Texas
Nothing to worry about in my mind with the gas coming out, more or less surprised there wasn’t a big flame with it!
Did you adjust a/f ratio (or re-jet) after putting the velocity stack on? And I’d hope you put some sort of mesh screen or sock filter on.
Did you adjust a/f ratio (or re-jet) after putting the velocity stack on? And I’d hope you put some sort of mesh screen or sock filter on.
Thread Starter
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6th Gear
Joined: Jun 2019
Posts: 10
Likes: 1
From: Wv
I did not rejet the carb, the person who had it before me, they had the carb jetted for a intake that breathed more and sucked in more air than the stock s&s super e intake with filter so i put the velocity on it to see if that helped the bike run better. I'm planning on slipping a filter over the velocity or getting another Velocity that is made with a filter. I did adjust the a/f ratio for a smoother idle than what it had
HDF Community Team
Joined: Mar 2017
Posts: 7,860
Likes: 4,420
From: Texas
Unless it has the same amount of air going in as it did previously, it needs to be rejetted to get the same performance. Sounds like you need to rejet since you've got a ton of air flow in now. But don't rejet now then add a filter later, because then you'd probably need to rejet again.
Thread Starter
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6th Gear
Joined: Jun 2019
Posts: 10
Likes: 1
From: Wv
Unless it has the same amount of air going in as it did previously, it needs to be rejetted to get the same performance. Sounds like you need to rejet since you've got a ton of air flow in now. But don't rejet now then add a filter later, because then you'd probably need to rejet again.
HDF Community Team
Joined: Mar 2017
Posts: 7,860
Likes: 4,420
From: Texas
My velocity stack came with a couple different sized mesh filters, but I didn't use them as they restricted a lot of air flow. Instead, I used this pre-filter (a rain sock essentially): https://filterwears.com/products/fil...smart_campaign
Thread Starter
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6th Gear
Joined: Jun 2019
Posts: 10
Likes: 1
From: Wv
My velocity stack came with a couple different sized mesh filters, but I didn't use them as they restricted a lot of air flow. Instead, I used this pre-filter (a rain sock essentially): https://filterwears.com/products/fil...smart_campaign
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HDF Community Team
Joined: Mar 2017
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From: Texas
Do you have any jets available to swap in and out? I'm guessing you're probably just one or two jet sizes away from what you need. Do you know what size jets you have currently?
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Thread Starter
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6th Gear
Joined: Jun 2019
Posts: 10
Likes: 1
From: Wv
I do have other jets but i dont know their size. they are from when my dad still owned the bike 13 years ago before he passed away. the paper work i have with the bike i dont know what is all up to date. i have no idea whats in the carb and the jets i have i have a bottle full of jets that came with the bike, they are from what i assume was when the thunderjet was still in the carb and the bike was built differently when they were used. the bike went through another owner before i got it back.
HDF Community Team
Joined: Mar 2017
Posts: 7,860
Likes: 4,420
From: Texas
Sorry to hear. The jets should have numbers on them (on the face where the screwdriver slot is).
I hope this tuning document helps: https://www.sscycle.com/docs/default...g.pdf?sfvrsn=0
I hope this tuning document helps: https://www.sscycle.com/docs/default...g.pdf?sfvrsn=0