White smoke from exhaust
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Junior Member
Joined: Apr 2021
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From: Texas
White smoke from exhaust
So, I just got done fixing an issue on my bike so I figured I would save a lot of your time searching for a resolution.
this was done on a:
2001 Honda CBR929rr Erion Edition
you got lots of white smoke coming from your exhaust? or a rich gas smell? No need to panic! It’s a cheap and easy fix, possibly...
1st step)
balance your bike and check your oil level, there should be 2 lines on the spy glass of your casing. Lower line is low and upper line is full. If it’s completely full? You are over filled and will blow white smoke. (Having the spy glass full while balanced is fine, in some degrees, but put your bike on kickstand, if you see oil.. definitely way too much!) It will also stall your bike if it’s over filled. If your issue is now fixed you can skip the following steps, or you can proceed to go ahead and do an inspection..
proceed to step 2..
2nd step)
remove your oil cap, smell it.. if it smells of gas, then you have a bad “fuel pressure regulator”
those need to be replaced anyways if your bike has been sitting unused or you buy one that’s been unused. There is a rubber piece inside the regulator that stays lubricated from the bike being used, when it’s sitting for a while, that piece will dry rot and then allow gas into your manifold going straight to your oil. If you dont resolve that issue and ignore it.. you will fry your bearings!!! (Usually if you are smelling a strong gas odor from exhaust “rich smell”, is your first sign of your fuel pressure regulator going out)
you should be able to check this without removing your air box. It will be attached to your fuel rail.
Proceed to 3rd step..
3rd step)
remove the vacuum hose from your fuel pressure regulator. It’s going to be the hose pointing downwards that splits in 2 leading to your intake manifold. Once you remove that hose. Turn your bike on “do not start” just turn the key to on position to prime your fuel pump. If gas leaks from the end.. replace your regulator. It’s cheap and easy to replace. If it doesn’t leak?
Proceed to final step..
4th step)
remove your upper and lower air box. YouTube has great videos on how to do this “just type in year, make and model of your bike with the keywords
(remove air box)”
you will want to remove your wire housings from the plug boots, then you will want to remove the boots. Now we need to check our spark plugs, you could have a faulty plug and it’s dumping your fuel and going out your exhaust. I recommend getting a swivel bit 3/8 adaptor and a thin wall deep socket (that has a rubber catch inside) and a 3” 3/8s extender for this job. (If you dont have socket with rubber catch inside?) Get a 3/8s rubber hose to try to fish out by getting it over the ceramic. If some plugs and if not all look burnt, it’s faulty, if they look like they have caked up dry boogers, it’s oil leaking (that’s a big problem). If they look like they have been dosed with antifreeze and near frozen look, then you have a coolant leak (even bigger problem). If they are burnt, that’s a fouled plug and you need to replace your plugs. Once you complete all these steps, you should have fixed the problem.. but....
if you have not resolved your problem with these 4 steps.. you have a blown head gasket or a cracked head. That’s a whole different can of worms to dabble in!
(if you are still smelling gas and your white smoke problem is gone? Then you need “fuel injector cleaner” and if that didn’t work, it’s time to change your injectors..)
(since you are this far.. wouldn’t hurt to remove your fairings and check your coolant and levels. I recommend flushing every year to 2 years. 1 year for regular riders and 2 for weekend riders. It’s very simple, just search a YouTube video and follow the steps)
Congratulations! You can now save hundreds if not thousands each year by doing your own maintenance!
I wish you the best of luck in your diagnosis and safe riding my brothers/sisters!
this was done on a:
2001 Honda CBR929rr Erion Edition
you got lots of white smoke coming from your exhaust? or a rich gas smell? No need to panic! It’s a cheap and easy fix, possibly...
1st step)
balance your bike and check your oil level, there should be 2 lines on the spy glass of your casing. Lower line is low and upper line is full. If it’s completely full? You are over filled and will blow white smoke. (Having the spy glass full while balanced is fine, in some degrees, but put your bike on kickstand, if you see oil.. definitely way too much!) It will also stall your bike if it’s over filled. If your issue is now fixed you can skip the following steps, or you can proceed to go ahead and do an inspection..
proceed to step 2..
2nd step)
remove your oil cap, smell it.. if it smells of gas, then you have a bad “fuel pressure regulator”
those need to be replaced anyways if your bike has been sitting unused or you buy one that’s been unused. There is a rubber piece inside the regulator that stays lubricated from the bike being used, when it’s sitting for a while, that piece will dry rot and then allow gas into your manifold going straight to your oil. If you dont resolve that issue and ignore it.. you will fry your bearings!!! (Usually if you are smelling a strong gas odor from exhaust “rich smell”, is your first sign of your fuel pressure regulator going out)
you should be able to check this without removing your air box. It will be attached to your fuel rail.
Proceed to 3rd step..
3rd step)
remove the vacuum hose from your fuel pressure regulator. It’s going to be the hose pointing downwards that splits in 2 leading to your intake manifold. Once you remove that hose. Turn your bike on “do not start” just turn the key to on position to prime your fuel pump. If gas leaks from the end.. replace your regulator. It’s cheap and easy to replace. If it doesn’t leak?
Proceed to final step..
4th step)
remove your upper and lower air box. YouTube has great videos on how to do this “just type in year, make and model of your bike with the keywords
(remove air box)”
you will want to remove your wire housings from the plug boots, then you will want to remove the boots. Now we need to check our spark plugs, you could have a faulty plug and it’s dumping your fuel and going out your exhaust. I recommend getting a swivel bit 3/8 adaptor and a thin wall deep socket (that has a rubber catch inside) and a 3” 3/8s extender for this job. (If you dont have socket with rubber catch inside?) Get a 3/8s rubber hose to try to fish out by getting it over the ceramic. If some plugs and if not all look burnt, it’s faulty, if they look like they have caked up dry boogers, it’s oil leaking (that’s a big problem). If they look like they have been dosed with antifreeze and near frozen look, then you have a coolant leak (even bigger problem). If they are burnt, that’s a fouled plug and you need to replace your plugs. Once you complete all these steps, you should have fixed the problem.. but....
if you have not resolved your problem with these 4 steps.. you have a blown head gasket or a cracked head. That’s a whole different can of worms to dabble in!
(if you are still smelling gas and your white smoke problem is gone? Then you need “fuel injector cleaner” and if that didn’t work, it’s time to change your injectors..)
(since you are this far.. wouldn’t hurt to remove your fairings and check your coolant and levels. I recommend flushing every year to 2 years. 1 year for regular riders and 2 for weekend riders. It’s very simple, just search a YouTube video and follow the steps)
Congratulations! You can now save hundreds if not thousands each year by doing your own maintenance!
I wish you the best of luck in your diagnosis and safe riding my brothers/sisters!
Last edited by CBR Pharaoh; Apr 11, 2021 at 11:15 AM.
Welcome crew
Joined: May 2018
Posts: 918
Likes: 219
From: Winchester, VA
So, I just got done fixing an issue on my bike so I figured I would save a lot of your time searching for a resolution.
1st step)
balance your bike and check your oil level, there should be 2 lines on the spy glass of your casing. Lower line is low and upper line is full. If it’s completely full? You are over filled and will blow white smoke.
1st step)
balance your bike and check your oil level, there should be 2 lines on the spy glass of your casing. Lower line is low and upper line is full. If it’s completely full? You are over filled and will blow white smoke.
Only two issues I noticed with your post: 1) I believe it is possible to keep your oil level a little on the high side without blowing smoke. I've kept mine there for a few years with no issues, and 2) no pics. We love pics!
Super Moderator
Joined: Aug 2006
Posts: 5,304
Likes: 512
From: South Florida, USA
@CBR Pharaoh Welcome to the forum and thanks for the posting. I'm sure many will use it in diagnosing their issues.
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Junior Member
Joined: Apr 2021
Posts: 2
Likes: 0
From: Texas
First, welcome to the forum and thanks for posting a resolution rather than a problem!
Only two issues I noticed with your post: 1) I believe it is possible to keep your oil level a little on the high side without blowing smoke. I've kept mine there for a few years with no issues, and 2) no pics. We love pics!
Only two issues I noticed with your post: 1) I believe it is possible to keep your oil level a little on the high side without blowing smoke. I've kept mine there for a few years with no issues, and 2) no pics. We love pics!
Welcome crew
Joined: May 2018
Posts: 918
Likes: 219
From: Winchester, VA
On the kickstand, yeah, that might be a bit much! I'll usually get the wife to hold it or put it on the rear stand while I check it...
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