classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: mark2 on May 12, 2015, 08:19:56 PM

Title: su on triumph
Post by: mark2 on May 12, 2015, 08:19:56 PM

anyone have experience of running the su on a pre unit ? ive fitted one but running rich , may try a weaker needle any advice

Title: Re: su on triumph
Post by: R on May 12, 2015, 11:44:14 PM

Can we ask if you have the one specified for a Triumph.
And the recommended needle.
And correct floatchamber.

SU apparently have approx a thousand different needles and settings suitable for all manner of things,
so being somewhere in the ballpark is somewhat essential.

Is the choke system returning to normal running position correctly ?

Title: Re: su on triumph
Post by: mark2 on May 13, 2015, 07:45:16 AM

it is all standard mc2 , they sell 3 needles for this type at Burlen  , rich , normal and weak , the nut is right up so in its weakest position but when the slide is lifted it does not try to cut out as I would expect but picks up  , I have two on my MG . I will try the weak needle , the bike starts like no amal fitted triumph ever has . choke on first kick but ticks over too rich

Title: Re: su on triumph
Post by: R on May 13, 2015, 11:53:44 PM

Float height adjustment maybe ?

Title: Re: su on triumph
Post by: mark2 on May 15, 2015, 03:15:56 PM

sorted now thanks , weaker needle fitted why it should need it god only knows as its fitted with the bigger valve iron head