running lean on right pot??

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running lean on right pot??

Postby paul g » Mon Jun 20, 2016 10:05 pm

Still having troubles with right hand side plug reading lean?
running without snorkel and upped the jetting from 320 to 330, but right side plug still lean whilst left hand is a nice coffee tan.
this was fine I believe until I refreshed the top end ealier this year, only change was to run both rings as opposed to previous owner only running one.

checked fuel lines, filters, float heights, jets clean and new 330s, fuel flow is good to both carbs too. running o ringed head and fitted genuine base gaskets and there is no Sign of an air leak. But looks like there may be.... runs great but after track day tonight right spark plug is a creamy white whilst left looks spot on, o and I swapped out plugs too, any ideas what im missing?? MANY THANKS
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Re: running lean on right pot??

Postby Denzil » Tue Jun 21, 2016 4:26 pm

The barrels are prone to getting hair line cracks at the base, where the 4 studs are bolted down, also how good are your intake rubbers, if they are original, bear in mind that they are likely to be circa 30 years old.
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Re: running lean on right pot??

Postby paul g » Tue Jun 21, 2016 7:34 pm

thanks denzil, just been outside to check carb rubbers, look good but will take it off to check proper..... however I have now noticed what looks like a brass jet, carb heater perhaps? on the top off my right hand carb right beside the choke cable entry? Im not sure what it is and am wondering if it was blanked off before, as I would have thought it would suck in air? thanks again
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Re: running lean on right pot??

Postby ypm76 » Wed Jun 22, 2016 1:25 pm

Thats a TDR250 carb. They have a carb heater circuit. Block it off.
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Re: running lean on right pot??

Postby Denzil » Wed Jun 22, 2016 3:59 pm

ypm76 wrote:Thats a TDR250 carb. They have a carb heater circuit. Block it off.


They also have different pilot jets, be careful if you have a mismatched pair of carbs.
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Re: running lean on right pot??

Postby paul g » Wed Jun 22, 2016 8:53 pm

its been blocked off with liquid metal so its not the problem either, pilots and all jets are matched to each other..... carb boots are fine too. im going to change from single tank outlet to using both outlets by removing the reserve/on filter, maybe its just fuel starvation....
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