Here are some pics of what I got. Its a third over size and I cant find any
4th over. What piston can I put in this thing ???? Its a 37 mm piston.
Dave
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| Author: | dave c [ Thu Feb 14, 2013 6:02 pm ] |
| Post subject: | Need help with Pistons hs 90 |
Here are some pics of what I got. Its a third over size and I cant find any 4th over. What piston can I put in this thing ???? Its a 37 mm piston. Dave |
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| Author: | ThreePipesSmokin [ Thu Feb 14, 2013 7:31 pm ] |
| Post subject: | Re: Need help with Pistons hs 90 |
Dave, you should remeasure the wristpin, you have it too deep in the calipers. You can see the steps in this pic...  The pin should not be set back all the way, be sure the flats of the calipers are on the diameter and it's not settled into the relief. 
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| Author: | dave c [ Thu Feb 14, 2013 8:08 pm ] |
| Post subject: | Re: Need help with Pistons hs 90 |
Fixed  Thanks ! |
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| Author: | m in sc [ Fri Feb 15, 2013 6:28 pm ] |
| Post subject: | Re: Need help with Pistons hs 90 |
not to be a dick but should actually be at the tips, not the anchors. um.. id contact pgm yamaha in the uk or speedandsport in pa. |
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| Author: | dave c [ Sat Feb 16, 2013 7:13 am ] |
| Post subject: | Re: Need help with Pistons hs 90 |
m in sc wrote: not to be a dick but should actually be at the tips, not the anchors. um.. id contact pgm yamaha in the uk or speedandsport in pa. not to be a dick but .........LOL |
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| Author: | ThreePipesSmokin [ Sat Feb 16, 2013 8:33 am ] |
| Post subject: | Re: Need help with Pistons hs 90 |
m in sc wrote: not to be a dick but should actually be at the tips, not the anchors. Not to be a double dick,  but the tips (thinner) are the first part to wear and should only be used when that's all that will reach. The entire ground area is (should be) parallel and should give the same reading. Always wipe the surfaces clean, close the caliper and look through for light. If there is wear you will see a gap, usually at the tips. This means it's time to buy new calipers  , or just know not to trust the measurement at the worn area.  Check/set zero, then measure. Also look at the inside measurement points, if the caliper has been dropped they can get bent (usually cross over each other when closed), resulting in inaccurate readings. Remember, calipers can't be trusted to better than a thou anyway, for bore measurements and such use the proper tool, bore gauge, etc...
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| Author: | m in sc [ Sat Feb 16, 2013 9:01 am ] |
| Post subject: | Re: Need help with Pistons hs 90 |
c'mon bill! they don't wear, its the internal parts that wear and the head deflects! worn precision measuring tools should never be used... me personally, i like to use string and a tape measure. 'cause it lasts longer. and my calibrated eyebones.
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| Author: | ThreePipesSmokin [ Sat Feb 16, 2013 9:09 am ] |
| Post subject: | Re: Need help with Pistons hs 90 |
Yes, if the carriage rocks (either a joke or a Van Halen song here ) it can be adjusted with the screws on top of the carriage. If there are tight/loose spots then it is shot!  I'm just trying to halp Dave give good numbers here, I would never challenge your calibrated eyebones! 
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| Author: | m in sc [ Sat Feb 16, 2013 9:35 am ] |
| Post subject: | Re: Need help with Pistons hs 90 |
bottom line is the pistons are shot. maybe new top end time. |
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| Author: | m in sc [ Sat Feb 16, 2013 9:40 am ] |
| Post subject: | Re: Need help with Pistons hs 90 |
looking a bit further.. Id bet pw50 pistons will work, and they are a bigger bore. stock size on those is 40mm. punch er out, go big-bore!!! |
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