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post #1 of 22 (permalink) Old 04-18-2010, 08:16 PM Thread Starter
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engine very sluggish start when hot

2001 gsxr 1000, 1070 big bore. When first starting the bike, there is no problem. After riding for approx. 15 minutes and then stopping the bike, restarting is very sluggish, sometimes not turning-over at all. The battery seems drained but the battery is a new yusa. When the bike cools down for approx. 15 minutes, it cranks right up. LOST AND NEED HELP!!!!!!!!!!!!!!
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post #2 of 22 (permalink) Old 04-18-2010, 09:33 PM
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Re: engine very sluggish start when hot

Really sounds like your engine is getting tight after it reaches operating temps. Who did the work on the engine for you? do you know if the tolerances are correct?
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post #3 of 22 (permalink) Old 04-19-2010, 09:43 AM Thread Starter
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Re: engine very sluggish start when hot

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Really sounds like your engine is getting tight after it reaches operating temps. Who did the work on the engine for you? do you know if the tolerances are correct?
I know nothing about tolerances! Could you please explain? Some people say its my starter going out or it does not have the power to accommodate the compression. LOST
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post #4 of 22 (permalink) Old 04-19-2010, 12:57 PM
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Re: engine very sluggish start when hot

How new is this engine? Did you just recently have this 1070 done? If so, how many miles do you have on it?
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post #5 of 22 (permalink) Old 04-19-2010, 07:03 PM Thread Starter
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Re: engine very sluggish start when hot

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How new is this engine? Did you just recently have this 1070 done? If so, how many miles do you have on it?
I have approx. 6,000 miles on the 1070 and 29,000 on the bike overall.

Last edited by cheyenneboxer; 04-19-2010 at 07:05 PM.
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post #6 of 22 (permalink) Old 04-19-2010, 09:07 PM
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Re: engine very sluggish start when hot

I would give the builder a ring and see what he says, since he knows your setup better than anyone.
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post #7 of 22 (permalink) Old 04-20-2010, 09:15 AM Thread Starter
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Re: engine very sluggish start when hot

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I would give the builder a ring and see what he says, since he knows your setup better than anyone.
Now that I think of it, I can recall have the problem before the 1070 big bore build. HELP!
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post #8 of 22 (permalink) Old 04-20-2010, 09:30 AM
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Re: engine very sluggish start when hot

It sounds like the starter is effected by the heat the running motor gives off.

In cars with full headers You get this from the heat as well.

The wires and contacts going from your battery to the starter would be a great place to start. Remove and wire brush them just to make 100% sure there isnt an corrosion in the mix then try replacing just the starter. I bet you wont have to go any further.

Shit it isnt a "brand new" starter anymore and its taxed more than stock turning over the big bore kit everyday, I would say it is either time to put it out to pasture or at least clean the contacts.


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post #9 of 22 (permalink) Old 04-20-2010, 03:02 PM
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Re: engine very sluggish start when hot

Push 24v through that baby!

That should spin her nicely.
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post #10 of 22 (permalink) Old 04-20-2010, 03:17 PM
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Re: engine very sluggish start when hot

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Push 24v through that baby!

That should spin her nicely.
Just as long as there isnt any smoke trapped inside your wires.

It'll let that shit out with a quickness.
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post #11 of 22 (permalink) Old 04-20-2010, 09:55 PM Thread Starter
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Re: engine very sluggish start when hot

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Push 24v through that baby!

That should spin her nicely.
24volts; how is that possible and if so, would it affect the other components relying on 12volts?
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post #12 of 22 (permalink) Old 04-20-2010, 10:49 PM
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Re: engine very sluggish start when hot

Yeah, don't do that ^, it's a bad idea.

http://en.wikipedia.org/wiki/Magic_smoke

You say this problem started prior to your 1070 build? And you neglected to mention it to your engine builder?
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post #13 of 22 (permalink) Old 04-21-2010, 01:51 AM
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Re: engine very sluggish start when hot

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24volts; how is that possible and if so, would it affect the other components relying on 12volts?
No you only get 24volt prior starting the bike, relay cuts the second battery when you release the starter button. Most big block busas use 24volt cranking setup, and our old vw bug race cars use 6volt starter motors with 12v battery system (spins fkn fast) on ultra high comp big displacement motors.

But in reality, you really shouldn't need 24 volt on pretty "stockish" bike.
Even +1400cc busas can start nicely with 12v. One of our local guys 1700cc busa really needs the extra 12v to start. His motor makes 260whp without nitrous.
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post #14 of 22 (permalink) Old 04-21-2010, 11:32 AM
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Re: engine very sluggish start when hot

Okay, does nobody here deal with cars? With the 1070 kit I am assuming he raised your compression? Since your bike does not have the ability to pull timing when starting it is effected by the combination of timing and more compression when trying to turn it over. When it is cold it is easier but as heat and cylinder pressure build, it makes it hard to turn over. Think about drag cars with locked out timing, how they turn over slow and kick back occasionally.
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post #15 of 22 (permalink) Old 04-21-2010, 11:48 AM
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Re: engine very sluggish start when hot

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Originally Posted by dev1360 View Post
Okay, does nobody here deal with cars? With the 1070 kit I am assuming he raised your compression? Since your bike does not have the ability to pull timing when starting it is effected by the combination of timing and more compression when trying to turn it over. When it is cold it is easier but as heat and cylinder pressure build, it makes it hard to turn over. Think about drag cars with locked out timing, how they turn over slow and kick back occasionally.
Right... And all that would make zero difference if he had the slow cranking problem BEFORE touching his motor also like he said.
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post #16 of 22 (permalink) Old 04-21-2010, 12:00 PM
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Re: engine very sluggish start when hot

Ahh, when I read it, I read it wrong and thought that he said he was not having the problem before the kit. Carry on.
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post #17 of 22 (permalink) Old 04-21-2010, 02:15 PM Thread Starter
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Re: engine very sluggish start when hot

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Ahh, when I read it, I read it wrong and thought that he said he was not having the problem before the kit. Carry on.
With all do respect to the many responders, please can someone offer any suggestions I can understand and apply to fix this problem. I would appreciate it dearly.
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post #18 of 22 (permalink) Old 04-21-2010, 02:36 PM
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Re: engine very sluggish start when hot

I am going to stick with the compression causing problems after hot. And also, clean the contacts/replace the starter if you were having this problem before the kit.
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post #19 of 22 (permalink) Old 04-21-2010, 02:47 PM Thread Starter
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Re: engine very sluggish start when hot

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I am going to stick with the compression causing problems after hot. And also, clean the contacts/replace the starter if you were having this problem before the kit.
Unfortunately, I do not know what contacts are (please explain) and is there a stronger aftermarket starter out there I can purchase or go back with a new stock starter?
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post #20 of 22 (permalink) Old 04-21-2010, 03:06 PM
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Re: engine very sluggish start when hot

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Originally Posted by cheyenneboxer View Post
Unfortunately, I do not know what contacts are (please explain) and is there a stronger aftermarket starter out there I can purchase or go back with a new stock starter?
If your really that far down on the mechanics scale, get out the yellow pages and call your local dealer.

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