Intruder 800: One cylinder barely runs - Motorcycle-Journal Forums

HansMerkl · 08-07-2004, 10:15 PM

Hi,

Maybe some of the mechanics here can help me:

After the winter break my Suzuki Intruder 800 sputtered a lot and backfired. I followed the usual advice and did the following things:
- Check all wiring
- Replaced spark plugs
- Replaced the battery
- Took the carbs apart and cleaned them

The carb cleaning took me a few days but after reassembling the bike showed exactly the same problems (not the slightest difference). Pretty depressing after all that work ... but suddenly the blinding flash of the obvious struck me: I unplugged one spark plug, started the bike and voila:
The engine runs fine with only the front cylinder, but when it runs on the rear cylinder only, it idles, but as soon as I am trying to rev it up the engine will stall (no problem doing this with the front cylinder).

I have checked the spark of the rear spark plug and it looks fine (it looks the same as on the front cylinder).

To me that indicates a problem with the rear carburetor but before I take it apart AGAIN I would like to have a better idea what to look for.

Does anybody here have an idea what I should look for or any other things I should check before taking the bike apart?

Thanks in advance

Hans

ion54 · 08-07-2004, 11:53 PM

I would check the main jet.

HansMerkl · 08-08-2004, 08:29 AM

Well, I have taken it apart already and cleaned it. Is there anything else I can do?

DrBob · 08-08-2004, 09:54 AM

Have you hooked the bike up to a carb synronizer? If the two carbs are out of phase, it can cause the problem you describe.
Also, check the fuel line to the bad cylinder for obstructions or kinks. Is the float in that carb sticking or leaking? is the air filter for that carb clogged? \

HansMerkl · 08-08-2004, 02:42 PM

I think I got it.

Previously I have changed the mixture with both cylinders running. This time I unplugged the front cylinder and changed the mixture of the rear cylinder. This way I was able to get it run.
I think previously at idle speed only the front cylinder was running so it didn't make a difference what I did with the rear cylinder (it was wayyy off so small adjustments didn't help).
It seems it's a good approach to unplug one cylinder and adjust the other one while it's running alone. You can even ride the bike on one cylinder, just with half the power.
Hope nobody will tell me that this will blow some other parts

dirtyfingers · 08-08-2004, 09:25 PM

Intruder carbs are particularly unpleasant to work on for a few reasons:

1 front and rear carbs are completeley different, dont mix up parts between them

2 since both carbs are at the rear of thier respective cylinders they are syncrhonized via a cable. Fun!

3 getting the carbs synched without the proper tools is impossible.

So my suggestion to you would be to check those things, make sure no parts got mixed up, slides are indexed, get yourself some synchronizers or have it done at a shop.

HansMerkl · 08-09-2004, 08:08 AM

Can you recommend a source where to get synchronization tools?

dirtyfingers · 08-12-2004, 10:48 PM

www.denniskirk.com

08-07-2004, 10:15 PM	#1 (permalink)
HansMerkl Newbie Joined: Jun 2004 Posts: 4	Intruder 800: One cylinder barely runs Hi, Maybe some of the mechanics here can help me: After the winter break my Suzuki Intruder 800 sputtered a lot and backfired. I followed the usual advice and did the following things: - Check all wiring - Replaced spark plugs - Replaced the battery - Took the carbs apart and cleaned them The carb cleaning took me a few days but after reassembling the bike showed exactly the same problems (not the slightest difference). Pretty depressing after all that work ... but suddenly the blinding flash of the obvious struck me: I unplugged one spark plug, started the bike and voila: The engine runs fine with only the front cylinder, but when it runs on the rear cylinder only, it idles, but as soon as I am trying to rev it up the engine will stall (no problem doing this with the front cylinder). I have checked the spark of the rear spark plug and it looks fine (it looks the same as on the front cylinder). To me that indicates a problem with the rear carburetor but before I take it apart AGAIN I would like to have a better idea what to look for. Does anybody here have an idea what I should look for or any other things I should check before taking the bike apart? Thanks in advance Hans

08-08-2004, 09:54 AM	#4 (permalink)
DrBob In The Zone Joined: May 2004 Bike: several Location: Decatur, GA Posts: 2,763	Have you hooked the bike up to a carb synronizer? If the two carbs are out of phase, it can cause the problem you describe. Also, check the fuel line to the bad cylinder for obstructions or kinks. Is the float in that carb sticking or leaking? is the air filter for that carb clogged? \ __________________ Dream like you'll live forever, live like you'll die tomorrow. You MUST obey the pug dog!

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08-07-2004, 11:53 PM	#2 (permalink)
ion54 Seat Tester Joined: Jan 2004 Location: Toronto, Canada Posts: 77	I would check the main jet.

08-08-2004, 08:29 AM	#3 (permalink)
HansMerkl Newbie Joined: Jun 2004 Posts: 4	Well, I have taken it apart already and cleaned it. Is there anything else I can do?

08-08-2004, 02:42 PM	#5 (permalink)
HansMerkl Newbie Joined: Jun 2004 Posts: 4	I think I got it. Previously I have changed the mixture with both cylinders running. This time I unplugged the front cylinder and changed the mixture of the rear cylinder. This way I was able to get it run. I think previously at idle speed only the front cylinder was running so it didn't make a difference what I did with the rear cylinder (it was wayyy off so small adjustments didn't help). It seems it's a good approach to unplug one cylinder and adjust the other one while it's running alone. You can even ride the bike on one cylinder, just with half the power. Hope nobody will tell me that this will blow some other parts

08-08-2004, 09:25 PM	#6 (permalink)
dirtyfingers Ditch Magnet Joined: Mar 2004 Location: Chicago Posts: 167	Intruder carbs are particularly unpleasant to work on for a few reasons: 1 front and rear carbs are completeley different, dont mix up parts between them 2 since both carbs are at the rear of thier respective cylinders they are syncrhonized via a cable. Fun! 3 getting the carbs synched without the proper tools is impossible. So my suggestion to you would be to check those things, make sure no parts got mixed up, slides are indexed, get yourself some synchronizers or have it done at a shop.

08-09-2004, 08:08 AM	#7 (permalink)
HansMerkl Newbie Joined: Jun 2004 Posts: 4	Can you recommend a source where to get synchronization tools?

08-12-2004, 10:48 PM	#8 (permalink)
dirtyfingers Ditch Magnet Joined: Mar 2004 Location: Chicago Posts: 167	www.denniskirk.com

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