Best Battery For Cranking Modified Engine

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Oct 19, 2007 | 07:38 PM

bjornsson

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Best Battery For Cranking Modified Engine

I replaced the OE battery in my 01 RK in March 2006 because it died over the winter(not on a tender). Later that year I did some engine work.I am running 95 cu.in. 10.25:1 with S&S heads, 570G cams and a Mikuni carb. Ever since, I have trouble starting it when the ambient temp reaches about 50 degrees or less. If I give it a jump, it fires instantly. The current battery is from Batteries Plus. I figure it does not have sufficient CCA to crank the high compression engine. Should I go back to the OE battery ormaybe anOdyssey?

Oct 19, 2007 | 08:06 PM

1flhtk4me

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Joined: Apr 2006

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From: Billings,Mt.

RE: Best Battery For Cranking Modified Engine

Find one with more CCA's?

Oct 19, 2007 | 08:07 PM

maineultraclassic

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From: Biddeford, Maine

RE: Best Battery For Cranking Modified Engine

I would recommend the Odyssey...........over 900 cca for 5 seconds.

http://www.odysseybatteries.com/battery/pc925lmj.htm

That will be my next battery when I have to replace my stocker.

Steve

Oct 19, 2007 | 08:09 PM

SoCal_Pappy

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From: Southern California - Palm Springs Area

RE: Best Battery For Cranking Modified Engine

Compression release valves installed???

Oct 19, 2007 | 08:34 PM

Taterdog

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From: Lenexa, KS (KC)

RE: Best Battery For Cranking Modified Engine

Are you jumping battery terminals to battery terminals or connecting negative connector to another ground? Just wonder if you need to check the bike's ground connection to the battery.

Otherwise, yea, more CCA's.

Oct 19, 2007 | 11:09 PM

bjornsson

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RE: Best Battery For Cranking Modified Engine

I do have compression releases installed. I am jumping at the starter and clean bolt on engine due to easy access. I pulled the seat tonight when I got home and found both terminals of the battery clean. More CCA's are what I believe I'm after. Too bad Harley doesn't say how many CCA's their battery has.

Oct 20, 2007 | 05:56 AM

gunnert

Road Captain

Joined: Sep 2006

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RE: Best Battery For Cranking Modified Engine

If you have compression releases installed on a 95" motor and have trouble starting then you may want to check your battery cables. I ran your setup for 3 years with the same stock battery and no compression releases. When I did change batteries I went with the (I think model is 925) Odyessey. I got four years out of that battery and half of that was with motor being stroked to 116" (compression releases installed). By the way, the Big Boar battery IS the Odyessey batttery.