|Topic Review (Newest First)|
|01-10-2011 08:41 PM|
Originally Posted by flitecontrol View Post
|01-10-2011 07:41 PM|
Here is the link to Crobins external carb pics from the stickey thread at the top of the *Carbs and Fuel* forum.
"Marbleing" or "coastering" the exhaust header cuts off fresh air which causes unspent fuel to burn in the pipes. This is the source of the popping upon deceleration. You probably still need to richen the air/fuel mixture to eliminate/reduce further the popping, as the factory setting is only 1 5/8 turns of the screw out from the seat. See picture above for location. The a/f mixture screw is covered by a metal cap or plug, which needs to be removed in order to adjust the screw out further. Usual a/f adjustment fix seems to be from 2 1/2- 3 1/2 turns out maximum. Only 5 turns until screw falls out, so seal screw in place with dab of silicone sealant to retain setting and avoid loss of screw.
Link to fergy`s spline lube write-up and pics.
|01-10-2011 06:04 PM|
|flitecontrol||If you still have problems, try starting a new thread in the applicable section of the forum. You'll probably get more responses there.|
|01-10-2011 03:20 PM|
Originally Posted by flitecontrol View Post
|01-10-2011 12:08 PM|
Excessive heat is what 'blues' the pipes. There's combustion in the pipe. If the bike has not been 'marbled/coastered', by design, there is fresh air being delivered to the exhaust through the stock emission equipment. This fresh air can mix with the unspent fuel and burn in the pipe. As FliteControl said, coastering, and setting the fuel mix slightly richer will mostly eliminate this occurrence. Secondly, I would definitely check compression for a valve timing or closure problem. Excessive heat is one thing, but glowing red is an entirely different level.
Any time you remove the carbs, you should sync them as soon as the bike is running again. My 2 cents.
|01-10-2011 10:43 AM|
1. I've heard too lean a fuel mixture leads to blue pipes. Others may know more.
2. Backfiring on decelleration is normal for these bikes. If you ease off the throttle, it doesn't backfire as much. You can "marble" or "coaster" the engine to eliminate or greatly reduce the backfiring. Do a search for these procedures here and it should explain what is needed.
3. If the carbs are clean (many aren't) and it runs rough, it might need to have the carbs synched, but unless someting was done to the carbs, they should be synched already.
4. More than likely, the carbs need cleaning. Here's a good place to have it done at a good price if you don't want to tackle it yourself: http://www.carbworx.com/
5. Click on the Search button on the tool bar toward the top of this page. Type in Fergy under Member Search. Go to one of his posts and click on the spline lube procedure in his signature. Use a grease/paste with at least 60% moly content, such as Honda Moly 60 or Guard Dog Moly.
|01-09-2011 11:18 PM|
Originally Posted by VN750Rider/Jerry View Post
1. What causes your pipes to blue or get that strange look on them?
2. Would improperly adjusted air mix screws cause backfiring and poor low rpm/idle running?
3. Would a carb sync fix backfiring or poor idle?
4. Could it possibly be a burnt valve or valve seal? It doesn't even think of dieing at high rpms with the choke off btw. Just wondering (and praying its not)
5. And just out of curiosity, how do i get to the splines and where are they exactly O_o? Once I get there, what do i use to lube them properly? Oil, grease, gear oil like on a manual transmission (still have some from the one i just overhauled) and if its any kind of oil or fluid, is there a particular viscosity?
Anyone got an answer feel free to enlighten me, I'm very eager to figure this out and get my baby running. Then I can move on to the fun part. Cosmetics =)
|01-09-2011 08:28 PM|
|ZCraggRatt||I added a photo album that has a pictures of the left and right views of the carburators when they are mounted on the bike. Hope that helps.|
|01-09-2011 05:13 PM|
|flitecontrol||I believe member Crobins365 has (had?) a bunch of carb pics in her gallery. I just tried to access them and couldn't find them. Maybe you will have better luck!|
|01-09-2011 04:54 PM|
Originally Posted by ZCraggRatt View Post
yeah, i'm not bad with a wrench....only thing is, i'm having trouble putting the darn carb back in....i'm not sure which side goes where. I know they're labeled front and rear, but when i put them in that way it looks like my acceleration and deceleration cables aren't going to reach the carb the right way..if you or anyone else has a picture of their carbs from both sides, relatively close up, that would be a tremendous help. I'm in Florida btw, all year riding down here, whooo! Once I get her running properly anyway.
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