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Jan 22, 2018 | 07:09 PM

shankman

Thread Starter

Cruiser

Joined: Mar 2016

Posts: 106

Likes: 2

From: ct

pinging

hello , installed S&S 100" big bore kit on 05 88" twin cam., also 585 ez cams,ss carb,cam plate,oilpump,adj pushrods and dyno tyk programmable ignition mod. Have had pre-ignition noise 1/4 throttle then gos away. i have retarded ig module and rejetted carb.... any ideas where noise coming from and why? compression is 10.5:1 . all S&S says is have it tuned?? Can they do anything on dynometer in my case with carb? thanks Kevin .
Bike is 05 road king 13000 mi

Jan 22, 2018 | 07:15 PM

seniorsuperglideE8

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Joined: Jan 2007

Posts: 15,788

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From: along the shore of Mishigami

Is the pinging occurring during a roll on acceleration in top gear? Does it do this when you down shift when under hard acceleration?

Jan 22, 2018 | 07:24 PM

shankman

Thread Starter

Cruiser

Joined: Mar 2016

Posts: 106

Likes: 2

From: ct

roll on acceleration pretty much all gears worse higher gears

Jan 22, 2018 | 10:05 PM

67Shuv

Road Warrior

Joined: Jan 2018

Posts: 1,272

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From: SETx

Sounds like a lean tip-in or too much timing. I'd suggest properly reading plugs and going from there.

Jan 23, 2018 | 05:04 AM

foxtrapper

HDF Community Team

Joined: Nov 2012

Posts: 6,192

Likes: 2,423

From: USA

What octane gasoline are you using? If it's low octane, a higher octane may well take care of it for you.

Jan 23, 2018 | 05:20 AM

grbrown

Club Member

Joined: Jun 2007

Posts: 45,429

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From: Bedford UK

Quote:

Originally Posted by shankman

....all S&S says is have it tuned?? Can they do anything on dynometer in my case with carb?

That's top advice, take it. I like S&S stuff so much I bought an entire 107" engine with carb, complete with 585 cam, and have had it dynoed twice - once when new and later after an exhaust change. Get it dyno tuned - you'll be surprised how much different and better it is!

Jan 23, 2018 | 03:32 PM

0ldhippie

Ultimate HDF Member

Joined: Mar 2012

Posts: 6,129

Likes: 143

From: Santa Cruz

S&S and Mr Brown know what they are talking about. Why in the world folks do major engine work and never have it properly tuned in is unbelievable to me.