Above 30 mph bogging in colder temp By seanstr (Read 8,424 times)

[seanstr]

Oct 30, 2016 7:56:35 GMT -6 tvnacman said:

Have you done a valve lash check/adjustment. If not you will not get a stable a/f adjustment.

2 times to make sure.

I got the 110 in again. I'm leaving being alone.

I don't think there carburator is completely clean.

I missed things. I'm going to try to get a ultrasonic cleaner from harbor freight and of course disassemble and remove as much as possible and run that through, and then check all the circuits with air/come cleaner etc.

[jct842]

Of course making sure there are no vacuum leaks and the manifold is in perfect shape and the diaphragm rubber has no cracks or leaks. Also making sure the piston in the carb does not rub or bind and snaps back down easily.

[cyborg]

I don't want to create problems but by the time you get the cleaning bath tool wouldn't it be less expensive to get a nibbi or mikuni carb and set it and forget it?,,, I picked up a new in the box mikuni vm round slide for under $50 delivered,,, my Vespa et4 never ran better

[seanstr]

Oct 30, 2016 12:32:14 GMT -6 cyborg said:

I don't want to create problems but by the time you get the cleaning bath tool wouldn't it be less expensive to get a nibbi or mikuni carb and set it and forget it?,,, I picked up a new in the box mikuni vm round slide for under $50 delivered,,, my Vespa et4 never ran better

I have ordered a carburator in the past but it didn't help. But I'm with you on this?

I have ordered, but I'm still cleaning the current one after. I need the training.

[seanstr]

Hasn't come in, so a question.

I raised the float and this is what helped. If I raised it again, and it didn't leak out from being over filled I should be OK?

[cyborg]

Could have been a big part of the problem,, running the bowl dry,, I would say yes but don't get too nutty with the adjustment

[seanstr]

Oct 30, 2016 7:56:35 GMT -6 tvnacman said:

Have you done a valve lash check/adjustment. If not you will not get a stable a/f adjustment.

Yes

[seanstr]

Nov 1, 2016 11:42:37 GMT -6 cyborg said:

Could have been a big part of the problem,, running the bowl dry,, I would say yes but don't get too nutty with the adjustment

I tried to move it up a few mm's. I will try to move up a few more. I am close. 45 mph. Only stumbles at 35mph for a second, then moves right past it.

[seanstr]

I skipped playing with old carburator for now. New is already installed. Will test drive tonight, get carb fuel/air mixture adjusted as well as I can.

[seanstr]

No bogging with new carburator. Got to 45mph. Now to get to 55mph and 90mpg.

[cyborg]

Good,,,glad to see you got it sorted out,,,there's a piston right there

[tvnacman]

A lot of effort in a low priced item.

John

[seanstr]

Nov 2, 2016 21:36:40 GMT -6 seanstr said:

No bogging with new carburator. Got to 45mph. Now to get to 55mph and 90mpg.

So some bogging at 45mph. And it's at WOT. Also I cannot get up past 45mph.

OK my thoughts, I think when I took to the original shop I purchased from for bogging and not getting to 55 mph, I think they did changes that hurt gas mileage and top end. The sliders they put in are 11 grams. It comes with 13 gram rollers.

I'm going to install 14 gram sliders lower RPM's. I should get better gas mileage and better top end.

I hope.

[seanstr]

Still haven't gotten new slidders in. I'll install and drive a tank of gas out see what my speed and gas mileage are.

[cyborg]

When you're wot and you run into the bog,,,back off the throttle a bit ,,,if it picks back up and gets strong again this indicates a lean condition