Katana of the Month - May 2008 Ė XMAN75
 

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Mechanics 101 Can't get it to run right? Find a trick to add HP?
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Old 06-11-2018, 07:42 PM   #1
01kat750
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Default Running issues

I recently picked up a 2006 600 11,399 miles from another member in here. The bike sat in his shop for about 3 years untouched.
Iím having an issue I canít seem to figure out. Hoping someone in here has some insight on what to check next..

So far:
Changed oil and filter
Changed plugs NGK CR9EK
Cleaned fuel tank (inside was rusted)
Cleaned the stock carbs
Replaced carbs with a used set that is suppose to be good
Synced carbs
Did valve adjustment .005 intake .008 exhaust.
Cleaned petcock. I did notice petcock is slowly leaking fuel so I have one ordered.

Bike will idle fine.
Bike runs decent 5k to redline
Bike spits, sputters, and pops through exhaust from idle to 5k rpms while riding it.

And thatís the issue. No matter what I try or do, I canít get this to go away..

Any ideas or suggestions to try??
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Old 06-11-2018, 10:16 PM   #2
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Quote:
Originally Posted by 01kat750 View Post
I recently picked up a 2006 600 11,399 miles from another member in here. The bike sat in his shop for about 3 years untouched.
Iím having an issue I canít seem to figure out. Hoping someone in here has some insight on what to check next..

So far:
Changed oil and filter
Changed plugs NGK CR9EK
Cleaned fuel tank (inside was rusted)
Cleaned the stock carbs
Replaced carbs with a used set that is suppose to be good
Synced carbs
Did valve adjustment .005 intake .008 exhaust.
Cleaned petcock. I did notice petcock is slowly leaking fuel so I have one ordered.

Bike will idle fine.
Bike runs decent 5k to redline
Bike spits, sputters, and pops through exhaust from idle to 5k rpms while riding it.

And thatís the issue. No matter what I try or do, I canít get this to go away..

Any ideas or suggestions to try??
Jetkit? If yes, which one and at what settings?

What's the float height? How did you check it?

What's the A/F screws set at?

Aftermarket exhaust? Aftermarket Air Filter? Stock Airbox and properly sealed?

Krey
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Old 06-12-2018, 05:23 PM   #3
01kat750
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Stock carbs, not jetted
Stock air box and filter. Yes, properly seated
Aftermarket yoshi rs-3 exhaust
Air/fuel mixture screws have not been touched.
The plugs are still in the carbs

I have not checked float height. Not 100% sure how to do that.
The carbs I bought came off a stock bike and I have video of that bike running perfect prior to the carbs being shipped to me.

My buddy who I got the bike from thinks that the petcock could be the issue.
Since itís leaking, itís not properly delivering the fuel u til the high rpms and the vacuum is stronger?
Does this sound like it could be the reason?

Last edited by 01kat750; 06-12-2018 at 05:23 PM.. Reason: Automerged Doublepost
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Old 06-12-2018, 07:45 PM   #4
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Quote:
Originally Posted by 01kat750 View Post
Stock carbs, not jetted
Stock air box and filter. Yes, properly seated
Aftermarket yoshi rs-3 exhaust
Air/fuel mixture screws have not been touched.
The plugs are still in the carbs

I have not checked float height. Not 100% sure how to do that.
The carbs I bought came off a stock bike and I have video of that bike running perfect prior to the carbs being shipped to me.

My buddy who I got the bike from thinks that the petcock could be the issue.
Since itís leaking, itís not properly delivering the fuel u til the high rpms and the vacuum is stronger?
Does this sound like it could be the reason?
You need to put a jet kit in, and tune the carbs for the exhaust you have installed. I recommend factory pro always, but Ivan's are good also for the 98+ models. A good cleaning and adjustment to the air fuel screws is going to be a part of that jet kit instal. You will need to check and possibly adjust the float height based upon how the bike responds after the jet kit is installed. Factory Pro kits come with a detailed tuning guide that explains what to do based on what RPM feedback you get.

If it was a fuel flow issue, you would have higher rpm issues, not lower.

Krey
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Old 06-13-2018, 01:28 PM   #5
01kat750
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Itís funny you mention a jet kit..
the original carbs are jetted. I believe they have 117.5/120 jets. Iíd have to look to be sure.
With those carbs installed, it doesnít run any different. It still has the idle to 5k stumble..

The carbs that are in it are 112.5/115 jets..
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Old 06-13-2018, 04:28 PM   #6
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Just a thought, is that a full exhaust or slip on? Was wondering if you might have something clogged in the exhaust somewhere, like in the cat if it has one. It would be easy to look at, and check off the possibilities list.
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Old 06-13-2018, 06:11 PM   #7
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Over 3k rpm, itís usually a mechanical fault ( stuck throttle tube, binding cable, sticky carb linkage, bent or misaligned throttle plate, boot clamp catching the linkage)
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Old 06-13-2018, 09:35 PM   #8
01kat750
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Itís just a slip ok, not a full exhaust. These bikes donít have a cat.

And I donít think your understanding the issue. Bike runs great above 5k rpms. Runs like garbage from idle to 5k.

I got the new petcock in today and went ahead and pulled carbs again to check jets.
I confirmed I have 112.5/115 jets and they are in the correct carbs.
I noticed that the floats on 1/4 carbs are the same height and carbs 2/3 are the same height
All 4 carbs do not have the same height on the floats.
I donít have the tool to measure the float height so I will be ordering that tool to correct them..
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Old 06-13-2018, 11:10 PM   #9
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Old trick is to use an old credit card,cut it like an L to the correct height you need. Perfect tool.
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Old 06-14-2018, 03:59 AM   #10
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Quote:
Originally Posted by 01kat750 View Post
And I donít think your understanding the issue. Bike runs great above 5k rpms. Runs like garbage from idle to 5k.


I confirmed I have 112.5/115 jets and they are in the correct carbs.

I noticed that the floats on 1/4 carbs are the same height and carbs 2/3 are the same height
All 4 carbs do not have the same height on the floats.

I donít have the tool to measure the float height so I will be ordering that tool to correct them..
Standard jetting


Sounds like running rich in low-mid range float heights could do that you don't say what they are if less than 13mm this is on the rich side.

I just use a slide rule (vernier caliper) so I can change the distance to what I want

And make sure needle jet and jet needle are not worn (ovaled) or grooved

Quote:
Originally Posted by 01kat750 View Post
With those carbs installed, it doesnít run any different. It still has the idle to 5k stumble..
Hmm just remembered this,, odd indeed! have heard similar issues with coils or plugs breaking down not sure how you would check them apart from measuring resistance or trying a known set if you can beg borrow a set.

Do you still have the 750 swapping them over could check it out they are both the same

Last edited by Lachie; 06-14-2018 at 04:32 AM..
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