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Post by czmdiver on Apr 4, 2016 20:02:41 GMT -6
dmn. thats bout as bad as it gets.
It also did Not happen instantly it it was in progress.
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Post by czmdiver on Apr 4, 2016 19:53:58 GMT -6
Have your piston to cylinder clearance properly checked. As the final assembler its your responsibility. know it and note it.   |
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Post by czmdiver on Apr 4, 2016 19:03:59 GMT -6
Way better to ditch the pump for oil and add oil to fuel. The pump would be fine for a new stock engine, but once you get modifying you want to control exactly the oil you are lubing with. As an example if you depend on 1/2 the oil to come from pump what happens when the pump craps out? If you just add oil to fuel along with what the pump puts out now you will have smoke and spark plug fouling. 2 strokes have been run for a million years by lubing the fuel why change a good thing. Ill tell ya exactly why. The industry has lost complete faith the Joe scooter can properly mix his fuel to the correct ratio every time. If you add Oil to the Fuel in addition to the Pump you will drastically Lean out the Engine and she will most likely Seize unless you Up-jet to compensate. Be careful! |
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Post by czmdiver on Apr 4, 2016 18:58:00 GMT -6
Ok I nipped up my 50cc Minarelli piston and cylinder (12mm pin) and need to replace it. I'd like to go 70cc and need to hear from people who have done it.
I have blown one up previously (70cc) when Scootercraft sent me the wrong too tight piston for my stage 6 kit so I want to be careful this time.
My concerns are this. I have heard I should go aluminium instead of steel cylinder for cooling. Do I need to ditch the oil pump feed and go premix, if so, what ratio? Ideally I'd like to leave the pump in and add oil to the fuel tank as well. Also jetting, where do I start with a main, I will have a 19mm Mikuni with a 70# main standard for the 50. Any other concerns issues I should watch out for? As usual any help is appreciated!!!
 Ill address the Alum.(plated) vs Iron Sleeved Cylinders. The best thing for Iron is a Frying pan or the back yard grill. Iron holds heat, has horrible heat dissipation and thermal expansion property's. I try to avoid Iron if I can. Aluminum Plated cylinders have superior heat dissipation and thermal expansion qualities over Iron bores. Many have blamed a piston on a seizure but it was the Iron cylinder sleeve that expanded into the Piston causing the seizure.   I know the are both four smokers but one is plated and the other iron.  If ya want to go the pre-mix route thats cool Please use good quality mc synthetic oil. I'm not going to pick a ratio for you but you can go pretty darn lean upwards of 50:-1. Please stay away from the no name two smoke outboard oil at the gas station. An if you change ratio like Add More Oil, you have Leaned out you air fuel mix so be careful. More is Not better. |
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Post by czmdiver on Mar 20, 2016 5:56:44 GMT -6
baccio.comThere are a ton of "How To" Videos to address most of your question's right here on Scootdoc. Take and post some pics of your scoot and question areas.
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Post by czmdiver on Feb 12, 2016 17:43:37 GMT -6
Very cool.  Hey aren't you the KZ guy? |
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Rode today
by: czmdiver - Jan 31, 2016 18:16:16 GMT -6
Post by czmdiver on Jan 31, 2016 18:16:16 GMT -6
Ya I rode 69 and sunny in the NC today  |
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Issues
by: czmdiver - Dec 17, 2015 19:53:24 GMT -6
Post by czmdiver on Dec 17, 2015 19:53:24 GMT -6
Must got a whole bunch a water in the Belt/Clutch CVT.
Pop that cover off and have a look see.
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Post by czmdiver on Nov 12, 2015 6:09:29 GMT -6
Scooter racing parts (srp) Do you have a link for them? I can't find anything. Really would like to look at there product. |
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Post by czmdiver on Nov 11, 2015 14:35:04 GMT -6
Now with a Free Flow Exhaust Feed that 200 Mo How Bout some Pic's?
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Post by czmdiver on Nov 10, 2015 21:46:58 GMT -6
Well ya still should be able to get her down the road and back that Hogged out Stock Manifold aint gunna cut it. The Stock on the Right. I'm Not in Favor of it Supporting 200cc with a Cam.  That Stocker Cant be Hogged Out Enough.  Stock on Right. You can see there is a sizable difference. 
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Post by czmdiver on Nov 10, 2015 18:07:07 GMT -6
Is that a Stock Intake Manifold on there?
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Post by czmdiver on Nov 10, 2015 16:24:34 GMT -6
Ok it wont let me upload pics. But when im at tdc should the piston be flush with the top of the jug or have a small space between the top of piston and the top of jug. My old jug had a ring around the top of the jug like a black one Yes, the Piston Should be Flush with the Top of the cylinder. Nothing (-.000) in the Hole and Nothing  .000) Out of the Hole. This should maintain stock compression ratio. If that Piston is/was way down in the Hole you'd have pretty serious (-.020 or so) Compression Loss. I dunno if your seeing were the Top Ring was at TDC or ?? it will leave a Black Ring down in the Cylinder. |
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Post by czmdiver on Nov 8, 2015 20:44:01 GMT -6
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Post by czmdiver on Nov 8, 2015 20:39:18 GMT -6
Hello everyone. New to this so not really sure how to post or anything but here we go. Im building a 157qmj 60mm light piston(srp) 3mm stroker crank 30mm cvk carb 115 variator 10g rollers and ncy clutch with 1500 springs and stock torque spring free flow ex pipe. Not sure with what cam to go with. Can anyone help me out. I would really appreciate it.
SRP piston.. Is this a J&E custom someone made? Take a Very Close look at the Pistons to fit Strokers, there Cutting off the Skirt to Clear the Crank.   The More you Stroke it the Harsher the Rod Angle and You Need all the Skirt you can get. The NCY Piston on Left has had the Skirt Sawed off to clear that Crank  Here is a Properly Engineered Piston Skirt that Clears the Crank  |
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.000) Out of the Hole. This should maintain stock compression ratio.
