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150cc GY6 and Under Engine Tech GY6 and Smaller Technical Discussion Forum |
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#1
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My NCOs in the Army would always push the importance of "ATTENTION TO DETAIL", making sure to do the job correct the first time. This applies to bolt torque levels too. I wanted to double check my valve clearance before taking my new motor on it's first semi-hard run. I didn't have a torque wrench out in the boondocks, so I just tightened up the bolts to the valve cover when I was done, not crazy tight mind you, but a bit too tight as it turned out. I putted around getting the motor up to temp. Well after a couple runs at about 3/4 throttle a hear a *PING!!* and things get noisy and another *PING!!* and I smell hot oil..Dang it if I didn't have two valve cover bolts snap halfway down their hole..
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2013 Trailmaster XRX 150 Type 86 stroker Taida 4V head with 23/22mm valves, forged 4V piston,Taida 62mm jug,forged Taida 8200 KDU stroker crank, Koso high-flow oil pump, Taida case half w/ oil cooler ports, Setrab oil cooler,TrailTec Vapor, Mikuni VM26-606, aluminum 30mm intake, Uni filter, aluminum stack, Hammerhead racing exhaust, MotoRio adjustable CDI/HO Coil, Iridium plug, Full Dr Pulley CVT kit w/ 16g sliders, JD's Mikuni slide kit 2014 Kandi 90B |
#2
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Wow you must have really man handled those bolts. I have never used a torque wrench on valve cover bolts on anything.
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#3
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Yeah, I'd never used one on those either, but maybe i need to cut back on the coffee, because I must have cranked those things down.. The bolt extraction was a classic on how not to do it as well..
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2013 Trailmaster XRX 150 Type 86 stroker Taida 4V head with 23/22mm valves, forged 4V piston,Taida 62mm jug,forged Taida 8200 KDU stroker crank, Koso high-flow oil pump, Taida case half w/ oil cooler ports, Setrab oil cooler,TrailTec Vapor, Mikuni VM26-606, aluminum 30mm intake, Uni filter, aluminum stack, Hammerhead racing exhaust, MotoRio adjustable CDI/HO Coil, Iridium plug, Full Dr Pulley CVT kit w/ 16g sliders, JD's Mikuni slide kit 2014 Kandi 90B |
#4
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were they stainless? cannot imagine a heat soaking causing a valve cover bolt to snap even if it was over torqued.
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#5
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Well, not sure of the bolt material, but as I mentioned, the extraction was sub-par and i wanted to see how badly I'd killed my threads. so i took one of the existing bolts and screwed it into the hole.. made it maybe 3/4 of a turn when that one snapped too.. almost like a shear pin. I'd love to replace them, but I have no idea what this type of bolt is called as the 4V valve cover bolts are a different kind. Lemme put some pics up...
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2013 Trailmaster XRX 150 Type 86 stroker Taida 4V head with 23/22mm valves, forged 4V piston,Taida 62mm jug,forged Taida 8200 KDU stroker crank, Koso high-flow oil pump, Taida case half w/ oil cooler ports, Setrab oil cooler,TrailTec Vapor, Mikuni VM26-606, aluminum 30mm intake, Uni filter, aluminum stack, Hammerhead racing exhaust, MotoRio adjustable CDI/HO Coil, Iridium plug, Full Dr Pulley CVT kit w/ 16g sliders, JD's Mikuni slide kit 2014 Kandi 90B |
#6
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To be clear, i used VERY little force turning the bolt that time..
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2013 Trailmaster XRX 150 Type 86 stroker Taida 4V head with 23/22mm valves, forged 4V piston,Taida 62mm jug,forged Taida 8200 KDU stroker crank, Koso high-flow oil pump, Taida case half w/ oil cooler ports, Setrab oil cooler,TrailTec Vapor, Mikuni VM26-606, aluminum 30mm intake, Uni filter, aluminum stack, Hammerhead racing exhaust, MotoRio adjustable CDI/HO Coil, Iridium plug, Full Dr Pulley CVT kit w/ 16g sliders, JD's Mikuni slide kit 2014 Kandi 90B |
#7
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Chinese buggies do have the worse quality bolts ever.
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#8
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Yeah, but it was a Taida head, they're pretty top of the line as far as parts go. I ordered 4 sets of bolts while I was talking to those nice folks in Taiwan as the guy at Napa looked like I'd handed him a spaceship warp core when I asked if he could get me some of those. None of the GY6 or Ruckus places seemed to have them either unless I was buying the entire 4V head. The motor rips though..
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2013 Trailmaster XRX 150 Type 86 stroker Taida 4V head with 23/22mm valves, forged 4V piston,Taida 62mm jug,forged Taida 8200 KDU stroker crank, Koso high-flow oil pump, Taida case half w/ oil cooler ports, Setrab oil cooler,TrailTec Vapor, Mikuni VM26-606, aluminum 30mm intake, Uni filter, aluminum stack, Hammerhead racing exhaust, MotoRio adjustable CDI/HO Coil, Iridium plug, Full Dr Pulley CVT kit w/ 16g sliders, JD's Mikuni slide kit 2014 Kandi 90B |
#9
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looks like thread pitch mis-match
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#10
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If I'm not mistaking the bolts are a torque limiting type in that they have a shoulder that contacts the head so as not to squish the rubber gasket just as used on most newer cars. I have never torqued them but tighten using a 1/4" ratchet with thumb and first 2 fingers. Maybe they had a bad batch, I would ask them.
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#11
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Yeah, are these things available stateside? What are they called? I just spent $35 on bolts (4 sets) from Taiwan... The holes threads are mangled too..I need to get a mechanic buddy to do a broken bolt extraction clinic. It was broken too far in for my Eazy-Out tool to reach (story of my life)..
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2013 Trailmaster XRX 150 Type 86 stroker Taida 4V head with 23/22mm valves, forged 4V piston,Taida 62mm jug,forged Taida 8200 KDU stroker crank, Koso high-flow oil pump, Taida case half w/ oil cooler ports, Setrab oil cooler,TrailTec Vapor, Mikuni VM26-606, aluminum 30mm intake, Uni filter, aluminum stack, Hammerhead racing exhaust, MotoRio adjustable CDI/HO Coil, Iridium plug, Full Dr Pulley CVT kit w/ 16g sliders, JD's Mikuni slide kit 2014 Kandi 90B |
#12
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I kinda doubt. You would have to try a Fastenal or someone like that. I would guess it to be a specialty bolt since you would have to factor in the thickness of the cover, gasket and the rate of squish of gasket.
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#13
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Could you use the correct length bolt with a piece of tubing and a washer? Slide the tubing over the bolt then a washer to act as the lip.
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#14
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You would spend more time and money and maybe not work than it would cost to get the correct part.
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#15
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While waiting for the right parts to arrive, I've done some pretty creative rigs..lol
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