95 spx low end bog. Video included

[TurnerBFC]

Hey guys!

So I have this 95 SPX. 657x
I rebuilt these carbs with mikuni parts.
Stock jets.
0 turns on high speed
1.25 turns on low speed
New fuel lines cleaned selector valve. Have currently bypassed selector for elimination.
Pop off checks out at 30psi.

If I punch it out of the hole, it will bog right down for 5 seconds then slowly rev up and the top end is fine. It wakes up and rips on the top end just as it should.

Cannot wrap my head around it.

Any suggestions?

http://youtu.be/oWg-ej7-sA0

 

[TurnerBFC]

Anyone? Is it crank seals?

 

[Rosie2514]

Is it like that all the time? How does it start cold vs warm?

 

[TurnerBFC]

Is it like that all the time? How does it start cold vs warm?

Hey!

Barely starts when cold have to crank it for 20 seconds with choke. Starts great warm.

 

[TurnerBFC]

timing was btdc 135°
And atdc was 77°

Seems to start better but haven't rode it yet. Rv Clearance was about
.013

With anyone's past experience would this timing error cause my symptoms?

I will water test this weekend.

 

[Rosie2514]

Im very surprised this thread hasn't gotten more attention from some of the more experienced members. If this was a 787 engine it would be solved by now lol

 

[TurnerBFC]

Im very surprised this thread hasn't gotten more attention from some of the more experienced members. If this was a 787 engine it would be solved by now lol

Yes I know! I wish someone would chime in. I am really lost with this pos.

 

[Rosie2514]

Im still going with a fuel issue.

 

[XP 787]

Was it bogging like that before you rebuilt the carbs? Compression #'s? Bad rectifier?

 

[Rosie2514]

Sell it as " Needs a carb cleaning":thumbsup:. Seems people fall for that one quite often lol

 

[TurnerBFC]

Was it bogging like that before you rebuilt the carbs? Compression #'s? Bad rectifier?

Wasn't running before I rebuilt them. 153 psi both cylinders. Have yet to check voltage at battery when running.

Thanks!

 

[XP 787]

OK good, does it also have the bog while running on the hose?

 

[TurnerBFC]

Water tested it this afternoon and it starts a lot better with correct timing but still bogs.
I'm confident the carbs and whole fuel system is clean and correct. So I pulled the easiest cover and this is what I found. What smells and looks fuel/oil solution. Looks to me like I may have found this issue??? Anyone ever see a mag crank seal cause this bogging

Sent from my iPhone using Tapatalk

 

[TurnerBFC]

Anyone? I am thinking this could be my lean bog cause.

 

[benstoker]

Is that from inside the mag case?