just bought a seca and it is acting weird.

Generally most back pressure is created at the collector (where the 4 pipes converge). Your mufflers have little effect on this.

 

Ok wanted to try something before I did the carb cleaning. I have a bike that is the exact same as the seca except the non factory exhaust on mine. I have been using this bike to swap parts out and trouble shoot and have just swapped the carbs. The bike now starts. It also now immediately screams up to 5000 rpms when it starts. I know these carbs to work fine on the other bike as i have ridden it many times this last week and it did not do that on it.

I have also attempted to adjust the idle and I have also tightened the fuel mixture screws as well.

Any thoughts?

Also, I intend to fully clean my carbs out as they look better than his so I can't have some beat up engine parts sitting on my pretty bike.

 

5,000 rpm's mean the Throttles are OPEN.

Look to see if you got the Throttle cable Linkage stuck-up under the Head.

If you did ... Welcome to the Club!

DON'T Pry it.
Loosen the Carbs and FREE it.
If you Bend it ... it will Break.
If you Pry it ... You'll have Linkage Binding to worry about.

Next time you mount the Carbs ...
Tie-up the Throttle Cable Linkage Device to the Choke Activation Rod until the Carbs are secure inn their Manifolds.

 

+1

my carb linkage got caught on a clamp turned to the side..

 

Ok I am looking at the throttle connection on the carbs and I dont see anything stuck. It adjusts position accordingly with the use of the throttle. I did notice however that I used to have significant play on my throttle before it reached the point where it opened up the throttle itself. This play has all but vanished.

But yes, looking at the throttle on the carbs everything is moving and nothing appears to be stuck. Then again, I am a complete amateur and could be looking at the wrong thing since I seem to do this often as well. The part I looked at was the throttle connection to the carbs and it does adjust when I use the throttle control.

 

hold on... im going to go snap a pic, and explain stay on

 

shoot man, I was going to go and take a pic of where the throttle lever and such hits the idle screw...

but I cant see it, or feel it...

sorry

i was wrestling with a hot engine though, maybe you can trydisconnecting the cable from the arm, and keep pulling on it, and in the middle, feel for it hitting something.. if its a bolt, then you're good

 

If the cable is now tight where before it was loose you may have a
routing prob. recheck how it's run and make sure theres some slack.

 

Sorry I had to log off. Thanks for the help. I know the arm moves when I engage the throttle I just dont know if something else is keeping it open. hmmm.

 

They can be touchy.
If the cable sheath is not given enough room then it will cause
the cable itself to pull against the throttle shaft. Even more so when turning the handlebars.
Happend to me the first time I put the cable back. It looked fine
untill I moved the bars,then up came the idle.
By the way hows the weather in Reno?
I drive rigs and have been to Sparks many times.

Ron

 

Hey guys.

I am a friend of cole.azare. As a matter of fact It's my SECA that he is poaching parts from as we speak.

The carbs he has on his bike right now are fit as a fiddle. I know this because I serviced them myself with the help of you guys here at XJbikes, and then testing them by riding that bike from Pennsylvania to California.

Anyway, I know exactly what Rick-O-Matic is talking about. From what cole.azare says, it might not exactly be the case, but I'll be at his place later today and we'll have a look at it. If Rick-O-Matic is right, then we have an easy fix on our hands!

We'll keep y'all posted.

EDIT: I just wanted to touch on what Parts said. One of the first things I did when I bought my Seca was swap my factory bars to motocross bars. The same thing happened. The throttle HOWLED as soon as I started the bike, and I had to fiddle with the cable position. We'll be sure to check that too,

 

Capturing the Throttle Cable Hook-up under the Head is common.

Having Intake Clamp on Upside-down will make the Linkage's stay open.
Hooking-up to the Choke Cable by mistake happens.
Cable Sheath not fully seated in Carb Holding Bracket
Throttle Cable Sheath pulled forward.
Loose Part stuck in Linkage not letting Linkage close.

Object used for Bench Sync too large. Throttles open.

5000 rpm's ... Those Throttles are definitely open.