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Post by oldgeek on Mar 13, 2017 19:35:55 GMT -5
The 54 already has some very thin cylinder skirts,,perhaps a .25mm(.010")would clean it up,the 52 has a lot more room for oversize..How are you doing the feeler gauge measurement?I remember the Wiseco bore sheet called out a 4lb pull on the feeler gauge to check clearance.. No rings, gauge across ex port, insert piston to deck, pull gauge out from base. Ya know, just like you taught us. Lol! |
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Post by oldgeek on Mar 16, 2017 21:47:11 GMT -5
This week I sold my harbor freight blast cabinet on local CL (useless IMO) and with some of the money I made a spot blaster that works perfect for what I need. I also bought a tyvek crawl suit and a harbor freight blast hood that covers your head. It took longer to suit up and set up than it took to blast the cases. I did it outside the back of the warehouse. I used baking soda with about 15% sand added to get the corrosion off of the cases. I know the potential dangers of using sand, but I only use a small amount, and I wore a dust mask under the hood. BTW my father let me do some sandblasting back around 1974 and it did not kill me....yet. LoL! The cases came out looking great! I am going to clean them up and paint them I think. spaz12 What is the color you guys were using on your cases? |
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Post by gsx600racer on Mar 16, 2017 21:55:55 GMT -5
This week I sold my harbor freight blast cabinet on local CL (useless IMO) and with some of the money I made a spot blaster that works perfect for what I need. I also bought a tyvek crawl suit and a harbor freight blast hood that covers your head. It took longer to suit up and set up than it took to blast the cases. I did it outside the back of the warehouse. I used baking soda with about 15% sand added to get the corrosion off of the cases. I know the potential dangers of using sand, but I only use a small amount, and I wore a dust mask under the hood. BTW my father let me do some sandblasting back around 1974 and it did not kill me....yet. LoL! The cases came out looking great! I am going to clean them up and paint them I think. spaz12 What is the color you guys were using on your cases? I am looking into this option for sandblasting parts. From what Iv read, the water "buffers" the abrasive and in soft materials the sand wont embed like it would if it was dry, plus with the water there is no dust. |
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Post by oldgeek on Mar 16, 2017 22:13:50 GMT -5
Looks like an adaptation of the dustless blast system, pretty cool. There is some additive they use in the water that prevents flash rusting from all of the moisture.
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Post by spaz12 on Mar 17, 2017 0:38:19 GMT -5
I used rust-oleum painters touch 2x satin granite. Pretty good stuff and looks even better if you use clear coat over it like O'Verse did on his.
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Post by oldgeek on Nov 16, 2017 23:27:17 GMT -5
I started back working on this project earlier this week. I finally got a couple replacement pistons for the 52mm and 54mm kits, but they are just as loose as the other pistons I have, so I am just going to run one as it is......Loose! Based on the latest duration checks using the new piston, I have finally decided to go with the 54mm cylinder paired with the 45mm stroke crank. I have also been thinking about what I want out of this build. @90gtvert has an awesome thread called Project 90 all about the 90cc+ stuff, it is a MUST read if you are thinking about doing 90cc+ build. His info on the bottom of the page is what I am baseing my decision on. The way the cylinder is setting up I can pretty much set the durations however I want without a lot of headache. So I might as well go with medium to high durations since the pipes I plan to use should support them. Around 188/132 or just a bit higher is what I am thinking. I might even go slightly higher, but I will be using a dellorto 21mm carb that I have on hand already and I do not want to build more than that carb can handle. I spent some more time truing the crank, after a couple hours tweaking on it I think it is good enough. It swings less than a 1/2 of a mark. I also installed a new bearing in the transmission using a case splitting tool to press it in.  I spent time rounding up some of the other parts I need to finish this build, I think I have everything I need to finish it here already.....somewhere! |
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Post by gsx600racer on Nov 17, 2017 0:52:38 GMT -5
I started back working on this project earlier this week. I finally got a couple replacement pistons for the 52mm and 54mm kits, but they are just as loose as the other pistons I have, so I am just going to run one as it is......Loose! Based on the latest duration checks using the new piston, I have finally decided to go with the 54mm cylinder paired with the 45mm stroke crank. I have also been thinking what I want out of this build. @90gtvert has an awesome thread called Project 90 all about the 90cc+ stuff, it is a MUST read if you are thinking about doing 90cc+ build. His info on the bottom of the page is what I am baseing my decision on. The way the cylinder is setting up I can pretty much set the durations however I want without a lot of headache. So I might as well with medium to high durations since the pipes I plan to use should support them. Around 188/132 or just a bit higher is what I am thinking. I might even go slightly higher, but I will be using a dellorto 21mm carb that I have on hand already and I do not want to build more than that carb can handle. I spent some more time truing the crank, after a couple hours tweaking on it I think it is good enough. It swings less than a 1/2 of a mark. I also installed a new bearing in the transmission using a case splitting tool to press it in. I spent time rounding up some of the other parts I need to finish this build, I think I have everything I need to finish it here already.....somewhere! Hopefully piston slap/knock will be minimum. I had a Malossi kit soft seized a couple times and after the 3rd time it started knocking once I cleaned up everything and put it back together. I know it doesn't take much to have them start making noise. I wonder if there are oversize piston option available and just hone the cyl? (52.4mm or 54.4mm) |
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Post by oldgeek on Nov 17, 2017 2:11:52 GMT -5
I started back working on this project earlier this week. I finally got a couple replacement pistons for the 52mm and 54mm kits, but they are just as loose as the other pistons I have, so I am just going to run one as it is......Loose! Based on the latest duration checks using the new piston, I have finally decided to go with the 54mm cylinder paired with the 45mm stroke crank. I have also been thinking what I want out of this build. @90gtvert has an awesome thread called Project 90 all about the 90cc+ stuff, it is a MUST read if you are thinking about doing 90cc+ build. His info on the bottom of the page is what I am baseing my decision on. The way the cylinder is setting up I can pretty much set the durations however I want without a lot of headache. So I might as well with medium to high durations since the pipes I plan to use should support them. Around 188/132 or just a bit higher is what I am thinking. I might even go slightly higher, but I will be using a dellorto 21mm carb that I have on hand already and I do not want to build more than that carb can handle. I spent some more time truing the crank, after a couple hours tweaking on it I think it is good enough. It swings less than a 1/2 of a mark. I also installed a new bearing in the transmission using a case splitting tool to press it in. I spent time rounding up some of the other parts I need to finish this build, I think I have everything I need to finish it here already.....somewhere! Hopefully piston slap/knock will be minimum. I had a Malossi kit soft seized a couple times and after the 3rd time it started knocking once I cleaned up everything and put it back together. I know it doesn't take much to have them start making noise. I wonder if there are oversize piston option available and just hone the cyl? (52.4mm or 54.4mm) I looked high and low for oversized stuff but could not find it. I found a 53 piston that would fix the 52mm cylinder, but then I would have had to have it bored out so.... |
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Post by oldgeek on Nov 18, 2017 1:59:41 GMT -5
I fabbed up a .75mm base spacer from aluminium and checked durations with it installed. I ended up with 188/134, TDC looks like no head gasket will be needed. I think I will raise the ex port roof just a tad to move the exhaust duration up to 192, which should be a better match to the 134 of the transfers.
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Post by oldgeek on Nov 18, 2017 20:50:24 GMT -5
The 2 bearings pictured have the same number 6203, but I noticed 1 of them has 7 balls, and 1 has 8 balls. Which is better to use on the PDS?  |
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Post by Jwhood on Nov 19, 2017 1:35:16 GMT -5
Geek what cases you using the cpi style long case or a camam Ds longcase,I'm getting ready to put mine together but don't have a scooter yet to put it in
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Post by oldgeek on Nov 19, 2017 8:02:47 GMT -5
Geek what cases you using the cpi style long case or a camam Ds longcase,I'm getting ready to put mine together but don't have a scooter yet to put it in CPI style long case set. What kind of scoot you gonna put it in? |
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Post by Jwhood on Nov 19, 2017 18:47:18 GMT -5
Geek what cases you using the cpi style long case or a camam Ds longcase,I'm getting ready to put mine together but don't have a scooter yet to put it in CPI style long case set. What kind of scoot you gonna put it in? Been looking for a small frame like a jog or a prebug no luck yet |
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Post by gsx600racer on Nov 19, 2017 19:58:48 GMT -5
The 2 bearings pictured have the same number 6203, but I noticed 1 of them has 7 balls, and 1 has 8 balls. Which is better to use on the PDS?  Bearing manufacture's claim more balls = more load capacity. Also the deeper the inside grooves and larger walls there is less metal deflection. Thick wall  Regular wall  |
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Post by oldgeek on Nov 19, 2017 20:17:37 GMT -5
Thanks, that is what I thinking the answer would be. I actually spent some time searching for the answer myself and 7 vs 8 never came up anywhere I looked. There was LOADS of information at SKF's pages, but no answer to my question that I could find.
The PDS is likely the hardest working bearing in a scoot. It might be wise to pay attention when selecting a bearing for it.
It figures because I have 5 brand new bearings with 7 balls and only the 1 with 8.
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