Moto Grand Prix
Main Motorcycle: 1973 Triumph TR7RV
Join Date: Oct 2013
Location: Pleasant Hill, CA USA
Other Motorcycle: 1964 Triumph Mountain Cub
Hi horseflesh, The filter from the Bonneville shop is a Motao. I have a lot of experience with the Motao filter. You can get from Bonnie shop or direct from Motao on eBay. I always get my replacement filters direct from Motao via eBay. $10.00 ea, free shipping. Direct from Taiwan, takes about 1.5 weeks or less to California. After looking at different brand elements, I feel the Motao is the better quality & lowest price. There is no direct automotive replacement filter I'm aware of.
I first fitted the "improved" strainer with the metal band at bottom. This is a sludge band to reduce settled sludge from getting sucked through screen as sludge is thin enough to pass through. However after installing the Motao it pretty much stops 100% of sludge. A paper element filter of any type will keep the oil cleaner looking about twice as long as with the improved screen.
I can't say if a paper filter will make motor last longer, but every car I can think of uses a paper element filter. After overhauling a motor, it's surprising how many tiny metal bits is trapped by the paper. The paper filters really do work.
Regarding install, Motao has made some changes over time. If you look closely at photos on Motao web site you'll see they put oil feed tube to rear. Then you get a much longer feed hose from filter to motor feed pipe. That makes the install easier & clears center stand. The drain plug seal is 1/2" copper washer. They are sold at ACE hardware or many auto parts stores. The gasket is the same Triumph part, but you only use one, not 2 as with your screen. I use a nylock nut on top of filter instead of plain nut. Ace hardware sells them. 1/4-28 fine thread.
Supposedly the 4 holes are now larger... No matter you can just run a drill through them, making them same size as the original plate holes. Do not use any rubber O-rings for drain plug or feed pipe. Just use copper with some sealant on ring for feed pipe. Depending on you frame bottom shape & where the hex ends up for the feed pipe, the hex may hit frame so filter won't set flat. Just file it as needed.
If you want to run the oil feed pipe forwards like factory did, that's what's more work. Often, but not always the center stand will hit the drain plug head & also the "fins" on filter plate. I put a thin allen head drain plug in, & cut fins short for stand clearance on my 73 Tiger. I wanted the hose forward.
For oil hose I like Gates 3/8 auto trans cooler hose. Gates Fuel injection hose works good also. They both resist kinking & have a high heat rating. Sold in bulk by the foot at many auto parts stores. O'riley's has it near me, but you have to ask for it.
The Charlie's type filter is similar. Takes same element as Motao. The difference is the makers basically modify a regular sump plate to accept the filter. I've no experience with those. I'm told some hit center stand, some don't. Depends on shape of the retainer nut for filter stud.
You can put a spin on Norton filter also. Basically attaches to back of back bone with a 3" muffler clamp, or you can purchase a nice bracket. I'm familiar with these also. They work well. They go into return hose between motor return pipe & the oil return/rocker feed pipe. The elements are sold at Napa parts stores or Triumph parts sellers. Often special order only from Napa. They are an uncommon size.
If you decide on spin on filter in return hose, you'll need a new screen for frame. Get the improved version. You still need to clean screen at oil changes though. That's one reason I went with in frame. The other is it looks factory for when I show bike.
I've had the Motao kit for several thousand miles now & I've been very happy with it. My friends have spin on & very happy with those.
With the frame sump filter, you are sucking cleaned oil into motor. With a return filter you don't send dirty oil into frame. A few use both. From my observations it doesn't really seem to matter, both clean well.
Since you need a screen I feel frame sump filter is a good choice at this time. Either brand. If you decide on Charlie's, check with WOL as to the ones he gets.
Regarding oil, many of my riding friends & I use Mobil1 V-twin 20/50. Has very high zinc level & very good heat resistance. Works very well in our clutches. Walmart is best price. Many auto parts stores stock it so if on the road, you can get it.
If you need more details on Motao, send me a PM with your email & I'll send photos.