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Post by 90GTVert on Jun 10, 2019 20:12:46 GMT -5
Here's my oil test if anyone wants to see that whole thing with all of the details like jetting changes and how tests were done. I'd do it different today, but I still think it told a few things. 49ccscoot.proboards.com/thread/4871/stroke-oil-comparisonThe plug will likely have to be figured out. I'm already fouling the BR8HS when I ride around at the beach. Couldn't even make it through a single ride, granted they were 200+ miles, without fouling a plug 1/2 or 3/4 way through the day in town. I've got BR8HSA, BPR8HS, BR7HS, and maybe something else here. The 7 kind of spooks me because I tried one only one time and the engine failed on the first ride.
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Post by ryan_ott on Jun 10, 2019 21:20:37 GMT -5
I think 8 or 9 should be what you use. Have you tried 9 range plugs? That’s what I use and they seem to hold up well and I don’t change them that often maybe 500 miles or so but I do run a tight gap.
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Post by harleyracer59 on Jun 10, 2019 21:26:17 GMT -5
good read 90GT. what carb did you use that has an 85 and 85 main jet options? ive seen x5 and x2.5 increments, but never by x1. that would take forever to tune. going 1x1..lol stick with the 8 maybe even go colder to 9 if you try the extended electrode. sticking that out there can liven up the bike a little too. by not hiding the ignition spark way up in there
I almost forgot that too^^^^. tightening up the gap to 22ish might help your fouling problem also
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Post by 90GTVert on Jun 10, 2019 22:45:41 GMT -5
The carb with the 1 number jets was a stock carb that used 6mm jets. Don't recall which style I was using for the tight increments, but I have 6mm kits by Polini for my DellOrto PHBGs that go 1 by 1 in some areas.
Part of my fouling issue may also be the tune. 30MPG is lower than normal and my plugs always come out mostly washed clean.
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Post by 90GTVert on Jun 11, 2019 19:28:14 GMT -5
I've been working on a solution for my oil carrying concerns with a richer pre-mix. I've got a spot between the tank and rear that will just fit oil bottles. I just can't easily carry them there without some way of tying them down or something. I had to take the gas tank out to work in that area. When I drained the gas, I measured it all. Then I dumped the gas can full of pre-mix that I had into another container, measuring it as I went as well. Once I knew the amount of pre-mix that I had, I figured out the difference in oil needed to get it to 32:1 and dumped that in. I was curious if it would make an obvious difference in the color of the fuel so the pic below shows 32:1 on the left and 45-50:1 on the right. Can't say that it looks much different to me. Not that it really matters. I was only wondering if it would be different enough that mix issues could potentially be spotted. The area on the left side of the scoot, far side in the pic, needs to be left alone so I can keep my rear mounted cam setup there. The nut and bolt in the center of the rear makes it so that only 1 bottle would fit in the area well. That bolt is for mounting the plate that holds my tail/brake light and turn signals. I welded nuts into the ends of the frame for the outer 2, but went with a through-bolt for the center when it was modified. I needed to change that, so I drilled it just large enough to hold a flange nut and then welded that in so now all 3 mounting bolts go right into the frame and nothing has to come through the front. I didn't bother to make it look good. If I wasn't dumb enough to show everyone my crappy welds and such, no one would ever see this area anyway and it's flat so it works well for mounting. Besides, if you wanna see crappy welds you can look all over T2 anyway. Now I've got room for 2 8oz bottles in there, but I need some way to hold them. Luckily, I had a piece of scrap 16 gauge leftover from making new floor pans for the Nissan Altima last year. I wanted to build a box that the bottles could sit in. I didn't want to go so far as to make an enclosure, but something that 2 bottles would fit snugly in to at least make securing them easier. I started out by making the base. I just traced 2 bottle bottoms onto the steel and used that for the size of the box. Putting it together 1 piece at a time. Here's the finished box. It is a very snug fit. I can just fit 2 bottles and then I can hold the tops of the bottles and I can't throw the box off. I'm not even sure that I'd need to strap them in. Just made it with the leftover steel without having to go get more. What you see in front is all that was left. I've still got to mount this to the frame, but my knee was done long before the box was and I didn't wanna half ass the fitting and such so I called it a day at that point.
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Post by ryan_ott on Jun 11, 2019 19:38:22 GMT -5
I use small dish soap bottles. This one is also 8oz as the Amsoil bottle next to it. It’s just thinner. Could you turn your frame brace into a container?
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Post by 90GTVert on Jun 11, 2019 19:47:37 GMT -5
I like these bottles. I have literally used them the entire time that I have pre-mixed scooters and I don't use any other measuring device, so I'm kinda stuck on 'em. I don't think I need to do anything else beyond this. This will let me carry 48oz of oil, because 32oz worth will fit under the seat even when I carry tools and such. 48oz is 12 gallons of fuel worth. That takes my range from 240 miles to 360 miles. I like to ride, but 360 miles is a helluva day on a "49cc". I'm not sure that I've done over 300 in one day on T2. I know I've rode right around that much in 1 day before. That should give me a good safety margin.
Also, the frame brace is 1" aluminum. I think much less rigidity and it becomes decorative.
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Post by 90GTVert on Jun 12, 2019 19:05:42 GMT -5
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Post by harleyracer59 on Jun 12, 2019 20:57:24 GMT -5
looks good and secure. how much oil do you carry with you, and how many miles will all this oil let you travel? or how many fill ups does all this equate to? should we nickname your scooter the exxon valdez?.. don't run aground though... man im glad my oil pump can still handle the job on my little 70cc Hondas. going premix would render me to a 40 mile radius. theres something to be said for the simplicity of oil injection. do they even make a pump that could handle the job with that big of cc displacement?
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Post by 90GTVert on Jun 12, 2019 22:23:44 GMT -5
After all of the years of pre-mixing it feels normal to me. I carry 4 8oz bottles under the seat and now 2 8oz in the rear so at least 360 miles worth. As said above, not likely to be needed in that amount since most of the time I only ride 150-250 miles in a day on my beach trips. I'd rather have the oil on me just in case though. I can't really carry more under the seat because on those rides I have a tool kit, belts, wallet, phone, 20-something GoPro batts, memory cards, and usually a jacket liner or flannel and glove liners or another pair of gloves. That sometimes overstuffs the underseat area. When I went to H2O I had to make sure I didn't lose anything doing bouncy burnouts because the seat was so full that it wanted to open. I guess the add on carrier may seem like a lot of effort or silly, but to me it was unused space. This fits like it was meant to be there. If I rode like a normal person, I wouldn't even need oil under the seat. It would always be right by the filler neck. I like this kind of stuff. I can pretty much guarantee there is not another T2 anywhere because of little things like this... and prob no one else would want it anyway. lol Now if I could just get a perfectly reliable 20HP engine in there, I could finally call it done. Still waiting on those Gilera Runner SP 180cc engines (21HP stock) to become plentiful in the US. Then I'd mess with it to make 4 more HP and be broken down regularly again.
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Post by aeroxbud on Jun 13, 2019 5:08:01 GMT -5
I think it's a cool idea. Much better than running out of oil.
I am contemplating making a small box where the oil tank is now. On the slider there is no storage under the seat, at all. Will have a look next week when I take it all apart. Might be more hassle than its worth, for such a small gain.
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Post by 190mech on Jun 13, 2019 8:26:37 GMT -5
Had a thought about the piston and cylinder wear issue,,if some water entered the combustion chamber it will turn into steam and wash everything clean including lubrication from the cylinder walls...I'm still a 32:1 mix ratio fan though!!
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Post by 90GTVert on Jun 13, 2019 14:30:34 GMT -5
I bought a pair or turn signals for the rear to match the front when I had to replace those after the crash. I've just never bothered to do the install. The back is apart now, so I might as well do it. Before I started that, I straightened the rear panel out because it was bent in the wreck. I also ground off some road rash from one edge. I just used 2x4 chunks in the vise to squeeze the 1/8" steel roughly flat again. Then I welded on tabs for the new signals. I decided that I didn't want any "speed holes" leftover from the old signals so I made up a couple of 0.383" diameter buttons on the lathe to fit in holes instead of filling the whole thing with welds. There are some imperfections after one pass and grinding, but it's close enough. I may regret this. I'm not used to anything sticking out back there, so I may knock them off or at least run into them. If that doesn't happen, I think they're an improvement because the mounting setup is more universal and they should be a little more visible. I haven't even mocked it up with them installed to see how it looks yet. I just checked each side for clearance and moved on.
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Post by 90GTVert on Jun 15, 2019 8:08:17 GMT -5
I did a pressure test today. Rapid pressure drop. Found the CVT side crank seal leaking. Replaced that and still lost pressure quickly. Found that my filler for the trenching on the stator side is cracked and leaking again. This is the 2nd or 3rd incidence of this with this particular case. The other side has been no trouble and this is not a problem that I've had with other ported engines in the past with any regularity. I'm not sure what exactly is the issue with this side of these cases. For a second I thought perhaps it is related to going LC, since this is my first LC engine. I think it would actually have the opposite effect though. I would imagine that keeping the engine a little cooler and more consistent should make it less likely for an issue that could potentially be related to expansion and contraction with temperature variations. I found this at about 6:30 this morning and went straight to Wal-Mart to grab more JB Weld. At some point I'll see just how far I have to go with this. I'm hoping I can just dig it out a bit and refill without breaking all the way through. If I could get that lucky, I wouldn't have to even take the cylinder off. Otherwise, I'll at least be taking the cylinder off... possibly splitting cases.
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Post by oldgeek on Jun 15, 2019 8:43:36 GMT -5
Well that's a bummer. Lots of JB weld failures around lately. Makes you wonder if they changed their formulation or something?
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