January 2, 201412 yr I had a 1975 310 MAR and several of my friends had slightly earlier 250s from about 72 to 74 models. Sure the clutches were a bit heavier than modern hydraulics but nowhere near needing stilsons. The standard cables were good quality with oil nipples. I used to use graphited penetrating oil. None of us ever felt the need to modify the clutches in any way. Standard mod was to replace Hex Head sump bung with a tapered hex socket plug so it did not extend below the ally "sump" case.
June 27, 20233 yr Ancient thread I know but... A couple mentions of lighter clutch springs. @woody do you have a source or part number? I'm planning the Barnett clutch and definitely lighter springs along with a fresh cable on my 1976 MAR 350. I competed on it this past weekend for the first time and had a blast. I have another vintage event coming up at Laguna Seca in 2 weeks, so I want to try and get the bike sorted a bit better. Edited June 30, 20233 yr by buschog
June 30, 20233 yr On 6/27/2023 at 1:33 AM, buschog said: Ancient thread I know but... A couple mentions of lighter clutch springs. @woody do you have a source or part number? I'm planning the Barnett clutch and definitely lighter springs along with a fresh cable on my 1976 MAR 350. I competed on it this past weekend for the first time and had a blast. I have another vintage event coming up at Laguna Seca in 2 weeks, so I want to try and get the bike sorted a bit better. I've never tried lighter clutch springs myself so I don't know for definite who sold them, they aren't an actual Ossa part, they're aftermarket. I think it may have been a company here in the UK called Rex Caunt Racing. They never listed them as a part in their product list so you'd have to contact them to see if they still stock them. With Barnett plates I just back the tension off on my springs to get where I want by trial and error
July 2, 20233 yr On 6/30/2023 at 9:50 AM, woody said: I've never tried lighter clutch springs myself so I don't know for definite who sold them, they aren't an actual Ossa part, they're aftermarket. I think it may have been a company here in the UK called Rex Caunt Racing. They never listed them as a part in their product list so you'd have to contact them to see if they still stock them. With Barnett plates I just back the tension off on my springs to get where I want by trial and error Did you use shim stock or washers, or just leave the bolts a little loose.
July 2, 20233 yr 6 hours ago, buschog said: Did you use shim stock or washers, or just leave the bolts a little loose. Not sure what you mean by using shims or washers, I just reduce the tension on the springs by backing off the screws until I get a pull that feels comfortable without the clutch slipping. I've also lengthened the arm on the ignition cover
July 3, 20233 yr That answered my question. No worries about the clutch bolts continuing to back out then
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