intake leak or something else?
Thread Starter
|
Advanced
Joined: Jun 2011
Posts: 57
Likes: 1
From: Griswold,Ct.
intake leak or something else?
So im getting tired of the popping coming from carb area,and the hicupping and backfiring.
Yesterday when i got home from work,the bike was in operating temperature. I decided to let it idle,then i took some throttle body cleaner and spray around the carb. When i did this the idle went up,not drastically,but very noticable. What does this mean?
I am new to carbs,the bike is a 1991 sporty 1200. I dont know what kind of carb it is,nor know how to tell,but what i can tell you it has a forcewinder air cleaner on it.
For reference,i havent done anything to bike,it ran great when i got it,then out of nowhere all of the backfiring,popping from carb area and hiccupping started.
I appreciate all the help guys
Yesterday when i got home from work,the bike was in operating temperature. I decided to let it idle,then i took some throttle body cleaner and spray around the carb. When i did this the idle went up,not drastically,but very noticable. What does this mean?
I am new to carbs,the bike is a 1991 sporty 1200. I dont know what kind of carb it is,nor know how to tell,but what i can tell you it has a forcewinder air cleaner on it.
For reference,i havent done anything to bike,it ran great when i got it,then out of nowhere all of the backfiring,popping from carb area and hiccupping started.
I appreciate all the help guys
Slip- What do the plugs look like? If you have a intake leak, it should be running lean and the plugs should be white.
As far as intake gaskets, pretty easy to get at. I have a allen wrench I ground down on the short side to be able to get to the bolts on the intake "Y". Otherwise, proves to be tight. Couple o-rings.... very cheap fix.
As far as intake gaskets, pretty easy to get at. I have a allen wrench I ground down on the short side to be able to get to the bolts on the intake "Y". Otherwise, proves to be tight. Couple o-rings.... very cheap fix.
Slip-
Pull the tank off(ground wire by seat, two bolts, fuel line and vent line). From the back of the carb is a "Y" looking manifold. Pull the air cleaner and pull carb.(you need not disconnect the throttle cables, just zip-tie it so the carb is not hanging by them). There are 4 allen heads(if stock) holding the manifold on the jugs. This is were the ground down allen comes in- as it is a b!tch without grinding one down, even with a ball nose allen. Remove the allens and look on the 2 jug sides of the manifold. There are 2 o-rings.... these are your intake gaskets.
Pull the tank off(ground wire by seat, two bolts, fuel line and vent line). From the back of the carb is a "Y" looking manifold. Pull the air cleaner and pull carb.(you need not disconnect the throttle cables, just zip-tie it so the carb is not hanging by them). There are 4 allen heads(if stock) holding the manifold on the jugs. This is were the ground down allen comes in- as it is a b!tch without grinding one down, even with a ball nose allen. Remove the allens and look on the 2 jug sides of the manifold. There are 2 o-rings.... these are your intake gaskets.
Also- be sure to clean the "faces" on the jugs where the orings seat. I usually hit it with a brass brush, and spray brake cleaner on a rag and give'm a good rub down. (seals or only as good as the seats)
Cruiser
Joined: Apr 2010
Posts: 243
Likes: 3
While the bike is idling, spray it again at the top of each side of the above described Y, those are the intake prots and there are seals behind the flanges. If it does not raise the RPM your fine there. If it does, LEAK 
Then spray it again behind the carb where it attaches to the bottom of the Y, there is a carb to intake seal there too. It's easier to get to if you take the Air Cleaner off but also not necessary. Do a visual of how the carb is seated here, sometimes, if not properly aligned, the angle of the intake won't allow the carb to sit flush on that seal causing it to allow air to seep in.
Another note on leak checking, I would recommend using propane or butane as opposed to sprays. The gas can reveal smaller leaks that the sprays can't penetrate.
Hope it works out for yah!
Then spray it again behind the carb where it attaches to the bottom of the Y, there is a carb to intake seal there too. It's easier to get to if you take the Air Cleaner off but also not necessary. Do a visual of how the carb is seated here, sometimes, if not properly aligned, the angle of the intake won't allow the carb to sit flush on that seal causing it to allow air to seep in.Another note on leak checking, I would recommend using propane or butane as opposed to sprays. The gas can reveal smaller leaks that the sprays can't penetrate.
Hope it works out for yah!
Trending Topics
Seasoned HDF Member
Joined: Feb 2007
Posts: 5,067
Likes: 394
From: Edmonton Alberta Canada
, a lot cleaner way of doing it too!
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Thread Starter
|
Advanced
Joined: Jun 2011
Posts: 57
Likes: 1
From: Griswold,Ct.
Here is a question for you hd gurus.
I decided to ride my bike into work tonight. After i sprayed the carb with throttle body cleaner and heard the idle raise up,it pointed to a leak.
Ok,so tonights ride was perfect,no hesitation on steady throttle,very little backfires,and no popping coming from carb,also when i come to a stop when the bike got warm the idle was very high,.
What could have possibly happened? Did i temp make a seal when i sprayed?
I decided to ride my bike into work tonight. After i sprayed the carb with throttle body cleaner and heard the idle raise up,it pointed to a leak.
Ok,so tonights ride was perfect,no hesitation on steady throttle,very little backfires,and no popping coming from carb,also when i come to a stop when the bike got warm the idle was very high,.
What could have possibly happened? Did i temp make a seal when i sprayed?