Main Motorcycle: 1978 Triumph Bonneville
Join Date: Mar 2005
Location: Houston, tx
IMHO going to a higher viscosity oil won't solve the problem.
Here's the difference between a triple and a twin. On a triple you have plain bearings holding the crank in the center case. These are the first fed by oil then the rod bearings. If they are worn as shown by low oil pressure the rod bearings are going to be starved. Where as on a twin the feed is directly to the rod bearings. So even if they are worn they are still receiving full volume.
Factory says at least 75 psi at cruising. Just got back from a ride on my t150, 80 degrees F, running oil pressure 80-90 psi at 4000 rpm. Idle 35-40 at 1200. Doesn't hurt to set the idle a bit high. 800 miles on newly rebuilt bottom end. Big D in Dallas did the crank and supplied the bearings.
Did you have the crank turned when you did the mains?
Htown16, Houston, Texas
1978 T140E Bonneville, 1974 Trident, 1972 Commando, 1971 Commando
1974 Commando, 1970 BSA Thunderbolt, 2004 XL 1200R Sportster
Everything will be alright in the end.
If its not alright, its not the end.
Last edited by htown16; 06-08-2019 at 11:10 AM.