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Message started by drd1135 on 03/10/12 at 07:24:40

Title: Reassembling after Carb Cleaning
Post by drd1135 on 03/10/12 at 07:24:40

I put my carb back in my 2003 Savage. Since the battery box and battery are so hard to get in and out I was trying to start it using jumper cables attached to the battery leads. The starter sounded weak. Is there just not enough juice using the cables?

Title: Re: Reassembling after Carb Cleaning
Post by arteacher on 03/10/12 at 07:32:24

I am pretty sure the battery has to be in the circuit for the bike to start.

Title: Re: Reassembling after Carb Cleaning
Post by verslagen1 on 03/10/12 at 07:51:32

It's been done before.

maybe you don't have good contact?

set the battery in there w/out the box.

Title: Re: Reassembling after Carb Cleaning
Post by Routy on 03/10/12 at 22:17:50

24322471717375400 wrote:

Depends on the jumper cables. Most are just that,.....jumpers, 12 ga wire,.....made to have a battery in the circuit,.....not big enuff to spin the thumper, let alone have enuff reserve voltage to fire the ignition. The longer length takes its toll very quickly when working w/ the low voltage of 12 volts. Therefore if the std battery cables are 8-10 ga, the much longer jumper cables would have to be #2 - #4 ga to be equivelent.

Title: Re: Reassembling after Carb Cleaning
Post by drd1135 on 03/11/12 at 13:41:17

It turns over, but it's struggling and sounds like it's going slowly. I have another battery from a Road King which is more heavy duty. Can I use this one. It's the same voltage but more amps, clearly.

Title: Re: Reassembling after Carb Cleaning
Post by justin_o_guy2 on 03/11/12 at 20:14:54

Having more amps available hurts nothing, too few isnt healthy for the starter motor. Or so I hear,, I sure dont know why.,

Title: Re: Reassembling after Carb Cleaning
Post by Routy on 03/13/12 at 07:31:13

3E2127203D3A0B3B0B33212D66540 wrote:

Having more amps available hurts nothing, too few isnt healthy for the starter motor. Or so I hear,, I sure dont know why.,

Title: Re: Reassembling after Carb Cleaning
Post by justin_o_guy2 on 03/13/12 at 09:16:20

when voltage goes down, amps go up, and hi amps causes stuff to heat up

Well SunuvvaGUNN! Yea,, thats true allrite, so, if I run a long skinny extension cord to a, saaay,, circular saw, & theres a voltage drop, somehow the electric motor can suck more amps thru than if the V had stayed high? Im still not quite getting it, but that V down = amps up thing is sure getting me closer., I got 9 months of electronics in the airforce,,so, I know what you are saying is correct, Im just not sure how that works with a low V battery,, its sick, can it push that current thru? Im not sure yet,,

Title: Re: Reassembling after Carb Cleaning
Post by verslagen1 on 03/13/12 at 10:21:43

737C667D616774767E7067150 wrote:

[quote author=3E2127203D3A0B3B0B33212D66540 link=1331393080/0#5 date=1331522094]Having more amps available hurts nothing, too few isnt healthy for the starter motor. Or so I hear,, I sure dont know why.,

If a battery is too small......or just too old, the voltage under load drops instantly. And the fact is,.....when voltage goes down, amps go up, and hi amps causes stuff to heat up quickly. So like you said, a higher amperage battery is always better, because the voltage will stay higher, causing the needed amperage to stay lower, causing less heat buildup in the starter.
We remember the old 6v starting,......they drawed twice the amperage of the 12v, and they heated up fast too.
[/quote]
Routy, what you said makes no sense.
You can't compare a 12v system with a 6v.
V=IR and P=IV
Yes a 6v system will draw twice the amperage of a 12v... it's designed that way.
put a 6v battery in a 12v system and you get half the amps of the 12v battery because R remains the same.

Why is low v bad for a starter?
It's hard on the brushes, lower amps on a slow turning motor overheats the brushes.

Title: Re: Reassembling after Carb Cleaning
Post by ratz on 03/13/12 at 10:27:24

Ok,power (In watts) equals current(in amps) times voltage.
The starter motor consumes a certain amount of power to operate.
Lets say the starter uses 100 watts.(Actually probably more than that,but this is an example.)
12 volts X 8.33 amps =100 watts
Now if the voltage drops...
10 volts X 10 amps = 100 watts
The starter still wants to consume 100 watts,so voltage down = amps up.
Then a weak battery can't provide any more current.Once the starter motor is turning below it's rated speed it's current needs rise and you get heat.
On the long run of wire thing,the longer the run and the thinner the wire,the higher the resistance of the wire itself is. The cord then consume some of the power and releases it as heat,instead of passing it to it's destination.
There are some other factors,but I'm just trying to hit the basics.
(Sorry,looks like vers got it in while I was typing!)

Title: Re: Reassembling after Carb Cleaning
Post by Routy on 03/14/12 at 05:38:42

Quote:
Why is low v bad for a starter?
--------------------------------------------------
Versal,
If you (of all people here) don't know, I don't think I can tell you.

At least JOG knows how it works,...........but he cheated,...took a training course ! ;)