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

We have found the NGK iridium plug gives better combustion when running on the fuel we get in the Philippines. Whether or not that applies to the UK I don't know but I think that tells me NGK's advertising is not all hot air.... Concerning the exhaust restrictor and airbox mod. Removing the exhaust restrictor increases the cylinders ability to flow air. Our experience was that once the exhaust restrictor was removed the airbox snorkel became the next impediment to breathing. We removed the snorkel entirely (it just pulls out with a little persuasion) The difference was significant and instantly noticeable. We are often riding in +32deg ambient temps and sometimes up to 3500ft asl so again the UK situation may not be comparable. 

Another mod was to drill some holes in the airbox cover and remove the foam padding from the right hand side cover panel.  Again this seemed to help.  However we don't do any deep water stuff so for those that do these mods may be unsuitable. 

domski1 wrote:

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Have you got something to do with totally ttr's , I see the web site is in you siggy Brian?

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Yep - that's my retirement hobby! I need something to subsidise my projects and keep the grey matter active 

Just launched TTR "extras" which includes some of the miscellaneous bits that I seem to have accumulated supplies of - see http://www.ttr250.com/TTR_extras/

Brian