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Post by PIG on Apr 1, 2015 0:50:41 GMT -5
Oldgeek, I recently advanced my timing a bit and pretty much cleared up a sputter I had from o to about 1/2 throttle- which I assumed was from being too rich at the needle... Made an amazing difference! Just an idea for ya.. Agreed. I had to advance my timing once my set up got in the 11,000 to 12,000+ rpm range. I also use a w7 needle on my 19mm Dell and modified stock airbox. What rpms are you seeing at WOT? I assume that malossi pipe wants to make its power in the 11,000+ rpm range?
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Post by oldgeek on Apr 1, 2015 5:55:31 GMT -5
Oldgeek, I recently advanced my timing a bit and pretty much cleared up a sputter I had from o to about 1/2 throttle- which I assumed was from being too rich at the needle... Made an amazing difference! Just an idea for ya.. Thanks, I need to try that. I may have slotted the stator and advanced it just a bit already, but I cant remember if I did that on this one already or was it the 99cc build? LoL! I dont have a timing light, but I guess I would be ok moving it just a bit.
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Post by oldgeek on Apr 1, 2015 6:30:10 GMT -5
I don't check plugs a lot unless I just can't tell where I'm at just looking for wet or dry it it's way off. Sometimes a plug chop if I'm close and wanna make sure a tune should be good. Everyone has their own ways, but I worry about nothing but making sure it will idle if I have to stop and so it can warm up... can be rough but I don't want it cutting out. Then I work on the main jet WOT till I think I have that and it's good for at least a couple of miles WOT. Prob a lot tougher if you aren't in the country I guess, and especially if your jet sizes are off. I rarely mess with anything else till I'm getting good results and satisfied with a main jet choice. Then I readjust the idle mix and then I work on the needle position for 1/4-3/4. I usually just ride around and see if it sputters or sounds clean. Richen till it sputters because I want it to be rich on midrange. Save the fine tuning with different needles and stuff till I see if what's in there will work with some riding at part throttle and seeing how it responds to quick throttle. Recheck the idle mix usually when I change the needle. I follow the same route you describe, whether by accident, or more likely because you have told me this stuff before I think this build is pretty hot, and therefore a bit on the picky side. I didn't really intend to make it quite like this, but it is what it is.
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Post by oldgeek on Apr 1, 2015 6:40:01 GMT -5
Oldgeek, I recently advanced my timing a bit and pretty much cleared up a sputter I had from o to about 1/2 throttle- which I assumed was from being too rich at the needle... Made an amazing difference! Just an idea for ya.. Agreed. I had to advance my timing once my set up got in the 11,000 to 12,000+ rpm range. I also use a w7 needle on my 19mm Dell and modified stock airbox. What rpms are you seeing at WOT? I assume that malossi pipe wants to make its power in the 11,000+ rpm range? If my krappy tach is correct, I have had this thing anywhere from 10500 - 11600 at WOT. Top speed has been around 57-58. Surprisingly I think the power band is a bit lower than 11000 but I do not know for sure. I was looking for some specs. on that pipe so I would know for sure, but I have not found any so far.
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Post by 90GTVert on Apr 1, 2015 8:36:50 GMT -5
Oldgeek, I recently advanced my timing a bit and pretty much cleared up a sputter I had from o to about 1/2 throttle- which I assumed was from being too rich at the needle... Made an amazing difference! Just an idea for ya.. Thanks, I need to try that. I may have slotted the stator and advanced it just a bit already, but I cant remember if I did that on this one already or was it the 99cc build? LoL! I dont have a timing light, but I guess I would be ok moving it just a bit. The timing light isn't really necessary. I use it mostly so I know where I am and can repeat and report results. Don't go real far all at once. If you slot one the way I showed in a vid it can give something like 15° of additional advance, which is a lot. Move it a little and most likely you'll notice the pipe hitting a little easier, but if you hear spark knock get out of it and get home to back the timing off a little. Even if you think it's right, try going WOT once it's hot and then backing off the throttle slowly. Sometimes I'll get a rattle there when it's otherwise alright so I'll back the timing down a little more. As with anything else, try to do this by itself so you know what the timing is doing.
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Post by oldgeek on Apr 1, 2015 11:40:54 GMT -5
Thanks, I need to try that. I may have slotted the stator and advanced it just a bit already, but I cant remember if I did that on this one already or was it the 99cc build? LoL! I dont have a timing light, but I guess I would be ok moving it just a bit. The timing light isn't really necessary. I use it mostly so I know where I am and can repeat and report results. Don't go real far all at once. If you slot one the way I showed in a vid it can give something like 15° of additional advance, which is a lot. Move it a little and most likely you'll notice the pipe hitting a little easier, but if you hear spark knock get out of it and get home to back the timing off a little. Even if you think it's right, try going WOT once it's hot and then backing off the throttle slowly. Sometimes I'll get a rattle there when it's otherwise alright so I'll back the timing down a little more. As with anything else, try to do this by itself so you know what the timing is doing. Can you describe what spark knock sounds like? I think I know but would rather be sure. I run 93 octane @ 50:1 so hopefully I will stay away from it. Sent from my SGH-T999 using proboards
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Post by 90GTVert on Apr 1, 2015 14:29:50 GMT -5
Anytime I've had it on these 2Ts it sounds like a ticking noise. Sort of like if something very small and metallic got into the engine. Can be kind of like a rattle. When it's severe there's a lot of it, and at times you may only hear ticks periodically if the tune is jsut on the edge. Some have described it as the sound of marbles in the engine. The TaoTao's 4T sounded that way, but the 2Ts do not IMO. You're even more likely to hear it with a hot engine, a lean spot, backing out of the throttle slowly after WOT, or under a heavy load. If you've ever heard something like what's described before a soft seize, you've prob heard it.
I've had cameras on me or the scoot numerous times and somehow they never pick it up. It baffles me, because it seems so obvious in person. At any rate, I think you'll know it if you hear it and if you hear any kind of knock, rattle, tick, etc... then assume that's it.
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Post by oldgeek on Apr 1, 2015 20:01:27 GMT -5
Well, it was bound to happen sooner or later. I fubared the streetrace kit. My first complete destruction of a cylinder kit. It appears a ring got caught on the exhaust port roof. I think it actually happened the other day when my buddy and I were riding. I had a 102 MJ in, and it was slightly lean at WOT, but pig rich at the low end. I held it at WOT for about 2 miles a couple of times, and that is when it started acting funny. The only thing I did today before it seized was change the MJ up to a 104, and checked the timing. I did did not advance the timing any because I had already advanced it just a bit when I rebuilt it the last time, as you can see in the picture. I just forgot that I had already done it. So just a short test ride after installing the larger jet, and halfway through the short WOT part it shut off, for good. And here are the pictures of the aftermath. At least my beloved step cut head was not hurt.
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Post by oldgeek on Apr 1, 2015 20:09:54 GMT -5
I was hoping to not have to split the cases, but I cant find about 1/2 of the ring. I checked the pipe and crank area with a bore scope but only found 1/2 of the ring, and another small 1/2" piece. crank turns freely, so i got no clue where it may be.
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Post by jareeb on Apr 1, 2015 20:50:36 GMT -5
Its likely it made it out of the pipe. And sorry to hear/see. What's the new build have in store?
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Post by oldgeek on Apr 1, 2015 21:04:28 GMT -5
Its likely it made it out of the pipe. And sorry to hear/see. What's the new build have in store? No clue as to what I will do. I am tempted to get another streetrace cast iron kit and slap it on as it would be the quickest. I may try a kit that is better matched to the MHR pipe. I may do nothing, as $ and time are short for me ATM.
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Post by Deleted on Apr 1, 2015 21:24:51 GMT -5
gndnyntrntr
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Post by jareeb on Apr 1, 2015 22:32:28 GMT -5
I hear ya on the money part. You might be able to reuse your cylinder ans juat get a hoca piston for it?
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Post by 190mech on Apr 2, 2015 4:00:12 GMT -5
OUCH!Strange the ring broke as the port is quite rounded..Did the ring locating pin come out?Rings are cast iron,a magnet should fish it out,but I doubt it made it to the bottom end though..
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Post by oldgeek on Apr 2, 2015 6:21:04 GMT -5
OUCH!Strange the ring broke as the port is quite rounded..Did the ring locating pin come out?Rings are cast iron,a magnet should fish it out,but I doubt it made it to the bottom end though.. You are right, but the pin actually got pushed in! Closer inspection of the piston this morning found the 1/2" piece of ring I found actually has the notch for the ring locating pin in it. I found it in the pipe and the tip of it looks just like it snagged the ex port, broke off and fell into the pipe. I still gotta find the rest of the ring, it has to be in there somewhere. This makes me feel a little better knowing I didn't do anything stupid to have caused this.
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