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Post by brancher on May 6, 2012 18:43:35 GMT -5
ok, i tried the old belt today to see if surge would go away and it did. I think i might have the wrong belt or something. the new one i took off was a malossi 6112729. the old yamaha fixed it. yeah. why would a belt cause surge?
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Post by brancher on Apr 26, 2012 20:56:50 GMT -5
I just put a Dello 21mm on a Mina with a Polini sport and a Stage 6 pro pipe. It would get a lean swing with the stock carb bad. I could never get it all the way out without it being pig rich on the low end or lean part throttle. I suppose a new slide might help but its not worth the money spent IMO. This one would bog like yours, then get warm and detonate when rolling off the throttle. The 21mm Dello solved all that on this one. I was even able to close the squish more. ok, friend has another one i might try, will be a few days before i have time to mess with it.
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Post by brancher on Apr 24, 2012 8:09:45 GMT -5
The port timing would have to be really far off to cause anything weird like that I'd think, and you'd probably just end up with no power ever if they were that bad. The durations you posted aren't bad at all. Have you checked for intake leaks and case leaks? Yes, I made a tester like you showed and had no leaks. Was hard to get plug to sell in exhaust port. I did switch to the colder br9hs plug and might try a 8 or 7 but I don't think it would cause that. Tried putting stock Carb on that ran great on other scooter and it still did it. Tried my friends Carb, it still did it. If you come in slow on throttle, like 1/4 till u hit 30 then go wide open it doesn't do it. My clutch springs came in I might try them or put stock one on.
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Post by brancher on Apr 24, 2012 7:25:04 GMT -5
Well I'm glad I have never had soft sieze. But I still have A very bad bog that I explained. About 3 times before 30mph but very strong running in between them. I got my Carb set pretty close thanks to you all. Got my plug looking good.
Could it be in the drive side? Belt is brand new malossi. Or var. Clutch etc? I'm might get a yahmaha belt today.
Could the timing not being as suggested by a few on here make it do this?
Thanks for help..
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Post by brancher on Apr 21, 2012 22:45:13 GMT -5
maybe its an arreche carb thing but the bit i went to start with says im only a 90 jet (going by chart) jet says 95. so i went with 93 for now and still looks lean at wot but now runs like crap at 1/4-3/4. ill wait till i get the main jet right before i mess with that.
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Post by brancher on Apr 21, 2012 20:22:08 GMT -5
I have studied that post and have it saved. :spark:
I checked for intake leaks and have none. This is my plug at wot for 1 mile. Going to drill jet out and hope rain stops.
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Post by brancher on Apr 21, 2012 18:10:42 GMT -5
when you all do plug chops how far do you ride? I usually ride a mile and look. Then back a mile and look. Is that far enough?
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Post by brancher on Apr 21, 2012 15:31:07 GMT -5
A soft seize means the engine completely stops usually, as in it dies out. It can be restarted right away at times or sometimes it has to cool a little. What you described sounds more like a lean condition to me. Sometimes when lean they kinda surge like that. Hit the throttle and they go, then run out of fuel, then build up enough for another surge, then bog again, and so on. so do you think with my set up their is any way it is lean? I'm glad to hear its not to lean.
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Post by brancher on Apr 21, 2012 6:38:22 GMT -5
well the brand of carb is going to play a roll in the jetting if its a del carb with the oem air box you will need to run about a 98 main jet with a w8 needle with the open filter you will need some where around a 108 but if you did soft seize it you proably destoryed the piston if you hear noise the athena kit doesnt take well to soft seizes Arreche Carb.
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Post by brancher on Apr 21, 2012 6:36:43 GMT -5
I'm not positive it was soft seize. From what I read o here it was. From a stop if I give it wot it takes of and then bog/ss then it takes off again. It does it like three times from a stop to 40mph. It Sounds like the motor completely stops for a secound or two and then takes back off. Is that soft seize?
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Post by brancher on Apr 20, 2012 20:50:44 GMT -5
well i added 21mmcarb, 20mm spacer under cyl, br8hs plug now i have soft seize when i get on it from a stop at about 20mph. when i go down the road now it makes the knock at full thottle (from the little i drove it) i drove it about 3 miles looks lean with open air filter and 95 jet. added stock air box with neck removed and it seemed to run better but still looks lean. I can't beleive a 21mm carb with stock intake (carbon reeds)and stock airbox with 95 jet would be lean. Will have to get some jets. i never experienced soft seize before. I don't like it.
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Post by brancher on Apr 20, 2012 20:43:24 GMT -5
about 140 psi cranking warm that is unless they own the pos comprsion gauge from harobor freight you have been running this bore on a stock zuma carb for how many miles with a bpr7hs plug i see dates back to last aug with your posts about issues if thats the case your proably ready for at least a new ring if not a new ring and piston and if you ever soft seized this kit they dont take well to being soft seized i had it on a sinski scooter since last summer. i but it on the zuma with a new piston/rings two weeks ago with a new athena crank.(i notice rod had play and it had 8000 on it)
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Post by brancher on Apr 20, 2012 20:17:08 GMT -5
ill give you an idea most of the guys over on zf are running the thinest base gasket with the kit and the head gasket and running a .9 to 1.1 mm squish so it sounds like you are in the ball park if you file the piston in the area of intake ports you can raise that intak duration just a bit but it wont take much work on the piston what compression are they? if i put the head gasket on i drop down to 110? i tried my friends too while he was here and his did the same thing.
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Post by brancher on Apr 20, 2012 17:32:15 GMT -5
dont get me wrong i love to figure things out, but this is confusing. ex-184 in-120 added 20mm shim ex-185 in-122 .88 squish 130psi so i think i need file piston or head? i think i maybe over my head
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Post by brancher on Apr 20, 2012 16:09:32 GMT -5
yes once set at tdc zero it out turn till the port starts to open X2 and -360 and thats your port duration heck you can even do it with a caliper www.torqsoft.net/piston-position.htmland besides squish you use the base gasket to adjust your timings to where you need to get them and once you got your timings right if the squish is too high you mill the top of the cyl Ok thanks Getting ready to try it.
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