Carb Cleaner- let it dry? Does it affect gasket?

[scootnewb]

I installed a cam and started it up. 

With the new cam in the right position, the scoot was running really lean. Idling and back firing with just a little gas. 

I removed the carb, sprayed it all out and upped the pilot and main. When I put it back on the scoot. It would not start. The jet size wasn't that much bigger and before putting in the cam, it would start and idle with those jets (but run like crap) 35/100.

Should I have waited for the carb cleaner to dry or something?

So I decide to go back to the 33/96 which at least go the scoot running, this time when I removed the bottom of the carb, the rubber seal came off. I didn't think anything of it until I went to put it back on. It seems like it is bigger than it was. LOL I doesn't fit like it did before. Is this because of the carb cleaner too?

[scooterted]

Yeah, i try to avoid carb cleaner on rubber. Some rubbers dont tolerate carb cleaner real well. Carb cleaner goes right through nitrile gloves for example.

Ethanol fuel will make some rubber stuff swell too. But in this case i would think it was the carb cleaner since you just did it and it just happened.


Everything happens to you. Ive known a guy like that. Normally, He makes it out in the end though, despite constant frustrations.

Edit: i wouldnt expect a little carb cleaner to mess with running. Unless it was puddles of it. But then it still might run a little.

Also i think the 30 pilot would be small for a 50mm. Mine is 47mm with a stock airbox and i use a 31.

[scootnewb]

LOL. I just came back here to delete this post.

By the time I got finished doing some other things whatever the carb cleaner did to the rubber it seemed to go away. At least to the point where the rubber fits nicely now. Now I just gotta find the right jet combo.

I put in the A9 cam today, I found the stock cam was off like a tooth or so. WTF!

So when I put the A9 in aligned correctly, whatever tune I had done to the carb to make it run with the previous stock messed up cam position did not work. Once I popped in the A9 it started ok. The idle was higher but when I gave it a bit of gas on kickstand it would backfire. I think that indicates lean. But when I went up in jets I could not get it started again. Perhaps because I did not let the carb cleaner dry out IDK.

I am pretty drained but really need to get this going again.

[scootnewb]

Jun 1, 2018 13:39:23 GMT -5 scooterted said:

Everything happens to you. Ive known a guy like that. Normally, He makes it out in the end though, despite constant frustrations.



Also i think the 30 pilot would be small for a 50mm. Mine is 47mm with a stock airbox and i use a 31.

It was a typo. I went from a 33/96 to 35/100.

Well WTF I wonder if some carb cleaner got on the diaphragm.

This kind of 'bad luck everything happens to' is only related to the scooter AFAIK. These small things are a PITA but nothing compared to trying to order plastic for this thing. I have been sent hundreds of dollars of incorrect plastics. I sent them back and was refunded but my God it was unreal.


This is a practically band new Keihin, I hope I didn't mess it up. Now might be a good time to order a bigger carb or something IDK.

[GrumpyUnk]

Carb cleaner will/can mess up rubber parts. In many cases, they will shrink back to 'normal' size if washed with detergent & water, or just left to dry on a workbench. Apparently the vapor in the cleaner loosens the molecules in the rubber, making them swell up, but return after the vapor evaporates. I think.
That said, I am of the opinion you are making too many changes at the same time. Adding an A9 should not affect the start of the engine. The throttle plate is pretty close to being closed all the way, so the added intake of the cam should have little effect on startup.
More likely is a plugged pilot jet. It seems these carbs will absolutely poke you in the eye with their obstinacy if the pilot has any sort of blockage. They won't start. At least in my experience. Have you taken a look to see if that 35 is clear or blocked?
The A9 should flow more air at a given rpm than stock. As long as you don't go significantly over the previous volume, the carb should keep up. Until you start to pull more air than the carb can flow efficiently. In this case, air being a part of the mix the carb must flow, fuel being the other. If you flow at 5cfm for example, it will flow that at 6k rpm with one cam, and at 5300rpm with the A9. EXAMPLE ONLY, made up numbers. As long as the carb will flow 5 cfm, it won't care what 'engine' or 'cam' is behind it inside the engine, just the air & fuel being flowed. IF you get to higher rpm, where 9cfm is needed(for EXAMPLE AGAIN), it may be the carb cannot match the flow properly without jet changes. BUT, it should work 'the same' at lower rpms. At least I think so.
tom