|
Post by 90GTVert on Jun 9, 2019 5:29:35 GMT -5
I was kinda surprised to see it. It's been getting enough fuel to average just 30MPG. At least recently, it has ran 110s to 140 coolant temp and CHTs not peaking much above 300F. The CHT wasn't working for a while and it has had head gasket and pump failures though.
|
|
|
Post by 90GTVert on Jun 9, 2019 12:10:52 GMT -5
|
|
|
Post by 190mech on Jun 9, 2019 16:49:33 GMT -5
Ive noticed the factory 90cc cases are cut deeper than a 50 case,,I too had skirt problems,next time cases are split hog a bit more out..I agree the piston/bore scuffing seemed excessive,thought advanced timing or perhaps the premix oil isnt doing its job under your SEVERE riding conditions( ),perhaps a racing oil designed for long distance desert competition would help..
|
|
|
Post by 90GTVert on Jun 9, 2019 17:01:13 GMT -5
Current oil is AMSOil Dominator @ 45-50:1. Ignition timing is advanced, prob too far... but it ran so hard that I didn't wanna touch it.
|
|
|
Post by pitobread on Jun 9, 2019 19:12:44 GMT -5
Run it at 30:1
|
|
|
Post by 90GTVert on Jun 9, 2019 21:36:57 GMT -5
I put the top end together. Tried to go as simple as possible to see how it does. Form-A-Gasket 2 on the studs to seal the case, Ultra Grey coating both sides of the base gasket, grease on the o-ring in the head and Ultra Grey lightly on the central sealing surface of the head with a little extra where the indentations are. Prob the biggest reason that I've stuck with 50:1 for basically the entire time that I have pre-mixed is storage. At 50:1 I can carry enough oil for 300 miles. At 30:1 I can't carry enough for 250. I'd have to figure out a way to carry more oil somewhere else, without just strapping it to the scooter to try that. Judging by how much of a trail I leave at WOT now, I bet it'd look like the 2T equivalent of rolling coal at 30:1... which would be hilarious when I find a 4T at red light.
|
|
|
Post by ryan_ott on Jun 9, 2019 21:55:32 GMT -5
I have noticed in your videos you leave a nice trail. I’m at 40:1 so I’m sure mine is no better. I’ll have to mount a camera back there to see.
|
|
|
Post by 190mech on Jun 10, 2019 1:27:45 GMT -5
|
|
mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
|
Post by mattyslimz on Jun 10, 2019 8:00:42 GMT -5
I always get a decent trail after sitting at a red light. The longer the light, longer the trail.. I guess because it’s loading up sitting at idle? 190mech that was a great write up on the 2-stroke oil.
|
|
|
Post by pitobread on Jun 10, 2019 12:32:49 GMT -5
More oil, more power. Drink the oil and pee it out on an as needed basis.
|
|
|
Post by PIG on Jun 10, 2019 12:55:56 GMT -5
32-1 here
|
|
|
Post by 90GTVert on Jun 10, 2019 13:00:51 GMT -5
More oil, more power. Drink the oil and pee it out on an as needed basis. Hot damn! I'm just gonna run straight oil! Seriously, I'll give it a shot at 32:1 and see what happens. Should be no practical difference in 30:1 vs 32:1 and 32:1 is easier to remember. From way back when I did a ratio test with different oils in 2012, I've kinda wanted to go richer on the oil but I have been stubborn because of cost and carrying. Here are 2 results from my little bit of testing that only went as far as 40:1 that did show an improvement. I was mostly testing because at the time there were some claims that 100:1 worked just as well as 50:1 with Saber, but I think it's still somewhat relevant. Average Cruise RPMAMSOil Saber Professional @ 40:1 = 8800-9100RPM AMSOil Saber Professional @ 50:1 = 8700-9000RPM AMSOil Saber Professional @ 80:1 = 8500-8800RPM AMSOil Saber Professional @ 100:1 = 8500-8800RPM Havoline TC-W3 @ 40:1 = 8700-9000RPM Maxima Scooter 2T @ 40:1 = 8800-9100RPM Gas MileageAMSOil Saber @ 40:1 : 40.77MPG AMSOil Saber @ 50:1 : 38.68MPG AMSOil Saber @ 80:1 : 38.48MPG AMSOil Saber @ 100:1 : 37.03MPG Havoline TC-W3 @ 40:1 : 40.30MPG Maxima Scooter 2T @ 40:1 :39.79MPG
|
|
|
Post by pitobread on Jun 10, 2019 15:52:08 GMT -5
On the 2t research and development thread Mr overmars has said before more oil = more power. But the side effects are deposits and fouling. Depends on the oil but most synthetics run pretty clean.
I think most of those gp bikes run 20:1
On a race engine that only sees a few hours of use before tear down that's probably fine.
|
|
|
Post by 190mech on Jun 10, 2019 16:55:29 GMT -5
The smoke on take off is the bottom end gets loaded with unburned mixture at idle,even 4 stroking(misfiring)..Goose it and that load clears with a lovely cloud!
|
|
|
Post by harleyracer59 on Jun 10, 2019 19:14:17 GMT -5
More oil, more power. Drink the oil and pee it out on an as needed basis. Hot damn! I'm just gonna run straight oil! Seriously, I'll give it a shot at 32:1 and see what happens. Should be no practical difference in 30:1 vs 32:1 and 32:1 is easier to remember. From way back when I did a ratio test with different oils in 2012, I've kinda wanted to go richer on the oil but I have been stubborn because of cost and carrying. Here are 2 results from my little bit of testing that only went as far as 40:1 that did show an improvement. I was mostly testing because at the time there were some claims that 100:1 worked just as well as 50:1 with Saber, but I think it's still somewhat relevant. Average Cruise RPMAMSOil Saber Professional @ 40:1 = 8800-9100RPM AMSOil Saber Professional @ 50:1 = 8700-9000RPM AMSOil Saber Professional @ 80:1 = 8500-8800RPM AMSOil Saber Professional @ 100:1 = 8500-8800RPM Havoline TC-W3 @ 40:1 = 8700-9000RPM Maxima Scooter 2T @ 40:1 = 8800-9100RPM Gas MileageAMSOil Saber @ 40:1 : 40.77MPG AMSOil Saber @ 50:1 : 38.68MPG AMSOil Saber @ 80:1 : 38.48MPG AMSOil Saber @ 100:1 : 37.03MPG Havoline TC-W3 @ 40:1 : 40.30MPG Maxima Scooter 2T @ 40:1 :39.79MPG your test show everything. ^^^^ im sure you rode the same in all your "tests", hard... lol but at 40:1 you were cruising 1000 more rpm. not because you gave it more throttle, you got your best mpg with technically less gas. because it had more oil in your mix , = more lubrication, it had less drag on the moving parts, which let the motor run at a higher rpm, and took less power to rotate. could also have been running a little lean because the oil was offsetting the gas? I would try 32:1. see if it gets faster, id also upjet 1 size too. if your worried of fouling, step the plug up 1 or 2 #hotter, or a bprXhs plug if running recessed or normal electrode, or a bpXhs if running a br. with the raised electrode. thatll help keep from fouling. I personally would never have the guts to run at 100:1. and im pretty sure you ride harder than the hardest of us!
|
|