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

langley91 · Member

Standard exhaust modification

barra8 · Guru

If you have'nt already taken the restrictor out of the exhuast (header pipe)it would be an idea.

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Jarrah.

-- Edited by barra8 on Tuesday 11th of September 2012 11:18:39 PM

langley91 · Member

The washer in the exhaust is gone and i have also trimmed the snorkel on the airbox.

The old girl is running a little rich still as there us black residue on the number plate behind the exhaust.

i have read about people modifying the baffles in the exhaust, but can find no detail as to the recommended levels of modificaiton to the baffles to maintain a workable bike and not damaging the performance.

Purely after a little more noise to be safer in traffic

langley91 · Member

If anyone would like the link, i have found the plans to modify a standard silencer. regards

TTRfan · Super Guru

langley91 wrote:
If anyone would like the link, i have found the plans to modify a standard silencer. regards

Yes please!

domski1 · Senior Member

TTRfan wrote:
langley91 wrote:
If anyone would like the link, i have found the plans to modify a standard silencer. regards
Yes please!

Yes please!

TDVT · Senior Member

And yet another!

Thanks!

barra8 · Guru

Make that another just out of interest biggrin

Jarrah.

BM Steve · Guru

Come on Langly, stop with the teasing and get it over with confuse

You know we want to know !!

biggrin

langley91 · Member

Apologies for delay, computer issues...

http://www.budohead.com/bikes.php?bike=250ttr

Enjoy

domski1 · Senior Member

Very interesting link, also quite an interesting read about the starter problems too!

barra8 · Guru

Wow awesome as I must read it all when i have the time.

Finally a link that my antivirus allows too

Cheers langley91

Jarrah.

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TTRfan · Super Guru

Nice web page from Budohead but you have to put your own spin on anything you read - bit like Wikpedia really - you have to make your own judgement.

A couple of examples:

Bridging the sidestand safety switch. I had trouble with my first TTR in that it would cut out on bumps and I traced it to the sidestand flapping about and activating the switch. Instead of fixing the sidestand, I bypassed the switch. I got my come uppance a few weeks later when I rode off with the stand down. On the first left-hand corner, the stand dug into the tarmac and I was lucky to stay on. Quite scary though and could have been nasty if a car had been coming the other way disbelief I soon fixed the stand and re-instated the switch!

Neutral switch. Never had a problem with it snagging and don't know of another owner that has. I like having a working neutral warning light too much to think of disconnecting the switch.

With regard to modifying the standard exhaust, the reason I took this off the FAQ was that a couple of owners said that it made the exhaust very loud and it wasn't a "nice" loud.

Sorry to hijack the thread.

Brian

sammyttr · Senior Member

So would it be a good idea with every service to tighten those bolts on the sprag gear every thousand miles along with oil and cleaning air and oil filter, what size bolts are they and easy to get to.

domski1 · Senior Member

sammyttr wrote:
So would it be a good idea with every service to tighten those bolts on the sprag gear every thousand miles along with oil and cleaning air and oil filter, what size bolts are they and easy to get to.

They are not actual bolts, the gears just sit in a housing and have a washer on each side. The more common theory behind the starter problems is the rollers on the sprag clutch itself getting flat spots on them. And not disengaging when it should and then damaging the gears and starter.

sammyttr · Senior Member

so not much can be done then, oh well, sod it bump start it.

domski1 · Senior Member

The best thing to do is if in doubt replace the sprag clutch and inspect the other parts for any damage. If the gears and starter ok with a replaced sprag the bike will not give you any troubles in that area for many years!

langley91 · Member

Right, To sort my problem, did the usual Ebay searches and googled late in to the night, decided that the actual products were all far far far too expensive. So, then look laterally and started to search other yamaha models that looked similar. Ended up with the WR250f and the YZ250f, searched for their parts which led me to buying a second hand titanium exhaust for a YZ250F. on initial inspection they look similar, on trial fitment they are somewhat different. Bugger. out with the dremel to creat some relief cuts, application of some fire putty to the TTR downpipe and wrapped with exhaust bandage to create and "gasket " fits like a glove and with an exhaust clamp in place is a nice tight seal. Currently in the development process for a better hanger than i have in place as the pipe is slightly longer than the original. But, for £55, i have a lighter (much) and louder exhaust which makes me feel better on the road. As an asside it is not stupidly loud, was over taken by a much louder scooter this morning. An as an added bonus, the bike feels smoother and more lively to ride with a noticable difference in throttle response accross the range. All in all, fairly satisfied. Even if it is not the best looking job in the world.

tracker · Veteran Member

Any chance of a photo please