A forum for owners of Yamaha TTR250 trail and enduro bikes!

Sprok · Member

What is the port on the lower right side of the bowl for?

TTRfan · Super Guru

It's the overflow - there should have been a tube attached to it that runs down between the engine and swingarm.

Brian

TTRfan · Super Guru

It does sound like the float needle is not seating for some reason and allowing petrol to continue to seep into the float bowl cry

BM Steve · Guru

Hey Sprok

how much ethanol do you have in your fuel ?

in Aus we have 10% in 91-95 octane, I literally have never turned off the fuel tap and never had a leak in the 3 years I have had the bike

always starts first time, except for last week biggrin

I wouldn't blame the carby or it's internals if mine is anything to go by, I don't think it's an ethanol issue unless you have way more in your fuel in the US

Cheers

BMSteve

TTRfan · Super Guru

Sorry Sprok but I have no experience of the evil rubber eating ethanol fuel you write about. Also. I have not heard of this problem on the forum before that I can recall (and I am sure you have thoroughly searched for information) so have no experience to draw on or remedy to suggest disbelief

I am sure that if there was another owner reading your thread that knew the answer(s) they would have volunteered a solution by now so please don't be too harsh on us!

I have run the standard TTR carb on the many TTRs that I have owned and rebuilt and have not come across your problem before. The usual problem owners find is that fuel left standing in the TTR's carb blocks the pilot jet - something that I am sure could happen to any carbed bike.

Brian

mossproof · Super Guru

Don't infect this forum with your unpleasant comments! Sorry we can't think of a solution to your problem. Strongly suggest you look elsewhere, dude.

ttr steve · Super Guru

Sprok wrote:
I have tried it multiple times seeing if anything would seal but no luck. I think this is failure in the worst way.

I'm looking for a new carb. What's the best replacement for this old-school leaky piece of goodness? Something that can handle ethanol bullcrap.

Anyone else wonder if this is the worst possible place to post questions about anything? Yeah, I'm going to try anywhere else. You might do OK dude, but not in my life.

-- Edited by Sprok on Wednesday 14th of December 2016 12:11:23 AM

Not very nice to read cry Maybe don't post when you are drunk?

mossproof · Super Guru

"Anyone else wonder if this is the worst possible place to post questions about anything? Yeah, I'm going to try anywhere else. You might do OK dude, but not in my life."

I found this offensive.

" Sorry I asked here (really sorry, I was drunk and not thinking). "

And this.

You were right to ask here, someone might have known the answer. The fact that noone did does not make us all idiots thanks. What makes you think anyone on a general forum is any brighter than here? Sometimes going to an actual workshop and communicating face to face with a professional is best, rather than spending 8 months pontificating.

Anyway, till trying to work out why you've got the leak, and rereading one of the posts...

"The screw that was holding the seat was REALLY tight. Like ridiculously tight. "

Maybe so tight it cracked the alloy of the carb body? Since there are plenty of others on here from states using high ethanol content fuel, and none have had this problem, it seems odd to blame the ethanol?

Good luck.