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REV LIMITER???? (Read 1404 times)
KNOCKDOLIAN
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REV LIMITER????
03/02/10 at 13:31:17
 
Hi all, after playing with my carb and jets and things. It seems to work ok except. at max revs it cuts out. Ease off the gas a bit and it picks up again. I must stress this is MAX revs. normal riding not really a problem. Is there a rev limiter? Im also thinking coil problem. looking on ebay there are plenty of coils and cheep. That usually means that they are trouble and get replaced regularly  
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« Last Edit: 12/08/12 at 12:52:34 by Oldfeller »  
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dasch
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Re: REV LIMITER????
Reply #1 - 03/02/10 at 13:37:59
 
Most agree there is a limiter. Few got that far.
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KNOCKDOLIAN
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Re: REV LIMITER????
Reply #2 - 03/02/10 at 13:53:32
 
Thanks for the fast reply. Thats put my mind at rest. I was only hammering it to check carb having changed jets and exhaust. Am I right in thinking that with stock jets and exhaust it would be difficult to hit the limiter?

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LANCER
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Re: REV LIMITER????
Reply #3 - 03/02/10 at 16:34:08
 
on a bike with stock engine it MAY be possible to hit 6500 in 4th gear; in 5th gear (or 4th gear on an 80's model) you will not come near redline at wide open throttle.
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verslagen1
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Re: REV LIMITER????
Reply #4 - 03/02/10 at 16:54:05
 
oldfeller put that myth to rest.
There is no limiter on our bikes.
It's by design that you can't reach above 6500 rpm's.
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Oldfeller
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Re: REV LIMITER????
Reply #5 - 03/02/10 at 17:11:18
 
But Verslagen, nobody has ever blown up an engine.

Not me,

Not Lancer,

Not you.

........... Nobody.


Something is keeping us from fatal RPMs ....

I don't think we know yet what it is.

We have a black box,

But it is on a cruiser engine.

We had limits in the head exhaust passage -- some have removed that.

We had a cam limit -- some have removed that.

Some have wicked it on up pretty high ....

...  but no blown up engine yet.


  Why?


I dunno ...
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Stock silver 2002 ls650 with small saddle bags. Looks like Granny's old worn out bike, nothing special to it at all.
(all mods except BIG piston and carb change have been done, but do not show)
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verslagen1
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Re: REV LIMITER????
Reply #6 - 03/02/10 at 17:35:14
 
That's true, but until you uncorked it, there were some around here said you can't even reach 6500.  Until someone definitely got a tach and rev'd it up till it cut out, it don't got one and might as well stop talking about it like it was there hopin' to find it on some wild and crazy down hill run.
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Digger
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Re: REV LIMITER????
Reply #7 - 03/02/10 at 19:23:50
 
FWIW....

The old Road Rider magazine had a test of the Savage back in the mid-to-late 80's.

The author talked of bouncing off the rev limiter.
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Oldfeller
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Re: REV LIMITER????
Reply #8 - 03/06/10 at 02:28:55
 
OK, I'm up for a technical challenge.   We can even make a foot race out of it if you want a little competitive thrill in your life.

We have no collective answer after literally years of internal consideration -- so LET'S ASK SUZUKI ....  
(not generally what we do around here as a first choice, I know).  

If they get inundated with the question, then by golly the one person who speaks and writes Japanese might get off their duff and ask the people in Nippon who do really know -- the designers of the black box in question.

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« Last Edit: 03/06/10 at 07:42:10 by Oldfeller »  

Stock silver 2002 ls650 with small saddle bags. Looks like Granny's old worn out bike, nothing special to it at all.
(all mods except BIG piston and carb change have been done, but do not show)
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dasch
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Re: REV LIMITER????
Reply #9 - 03/06/10 at 05:29:33
 
just by watching this:

http://www.youtube.com/watch?v=npNRWgi2jsA

Ok, after he gets it going... at around 1:55... it seems it does have a limiter. You can tell it does a brraaap braaap braaap when it reaches max rpm.
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Oldfeller
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Re: REV LIMITER????
Reply #10 - 03/06/10 at 07:36:49
 
I used to be the "I think we have one" guy, but I had to admit we do not KNOW for sure.  That guy in the video has a stock cam and other stock items and he may just be riding the flat spot.

Our bikes have a built in top end flat spot ... this IS known.  A Lancer stage 2 unlocks the flat spot and you can spin it up a lot more.  Trouble is, now that flat spot is gone, what is keeping the engine from blowing up?

Back to "I dunno" ....  cause we don't know.
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Stock silver 2002 ls650 with small saddle bags. Looks like Granny's old worn out bike, nothing special to it at all.
(all mods except BIG piston and carb change have been done, but do not show)
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KNOCKDOLIAN
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Re: REV LIMITER????
Reply #11 - 03/06/10 at 12:05:25
 
Well im not so sure now. I changed the 55 idle jet for the 52.5 and it now seems to rev as hard as I dear. It must have been fueling problem but cant work it out. Why does the idle jet affect full throttle?
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LANCER
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Re: REV LIMITER????
Reply #12 - 03/06/10 at 19:41:42
 
Keep in mind that the symptom of a too rich main jet circuit will cause the engine to stumble at wide open throttle.
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jef.savage
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Re: REV LIMITER????
Reply #13 - 03/19/10 at 02:04:00
 
I don't have a lot of mechanical experience but this sounds very similar to a problem I ran into with my '66 Dodge Charger.  With the stock valve springs the engine would not rev past about 5600 rpm even though the tach showed a 6500 red line.  The springs just didn't have enough tension to close the valves any faster so they would "float", just staying open.  When I had the heads milled and replaced the cam I also replaced the springs with a competition set that had dual inner and outer springs like our bikes.  With the new springs the car would easily rev to it's red line and beyond, even in high gear.

I'm thinking with stiffer springs these engines may rev higher and even allow you to blow one up if that's your goal.
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Yonuh Adisi FSO
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Re: REV LIMITER????
Reply #14 - 03/19/10 at 11:59:38
 
jef.savage wrote on 03/19/10 at 02:04:00:
I don't have a lot of mechanical experience but this sounds very similar to a problem I ran into with my '66 Dodge Charger.  With the stock valve springs the engine would not rev past about 5600 rpm even though the tach showed a 6500 red line.  The springs just didn't have enough tension to close the valves any faster so they would "float", just staying open.  When I had the heads milled and replaced the cam I also replaced the springs with a competition set that had dual inner and outer springs like our bikes.  With the new springs the car would easily rev to it's red line and beyond, even in high gear.

I'm thinking with stiffer springs these engines may rev higher and even allow you to blow one up if that's your goal.


You know, that makes pretty good sense. We should have thought of that before.
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