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Post by x7rocks on Aug 23, 2021 15:52:31 GMT -5
Well. Idk about you guys. But I hate changing crank bearings in the minarelli. It is a down right sin against God for this specific job. So, here is my question. Why not use the skf nj204ecp/c3 bearing instead? Measurement seems right, and it seems to be good enough for malossi to use for their c one cases. I ask, since I'm in the final stages of putting together a 94cc engine (bearings are not installed on the crank) and measured them out from the one skf offers, and wondered if anyone else has tried them for their minarelli engines? They seem to be rated for the rpm we throw our engines. Can anyone think of a negative for this style of bearing? Link for info www.skf.com/us/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings/single-row-cylindrical-roller-bearings/productid-NJ%20204%20ECPLooking forward for any input on these things as I'm hoping they'd be a much easier way to upgrade our bearings to something way easier for removal.
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Post by milly on Oct 7, 2021 11:42:20 GMT -5
I have used skf bearings as a replacement in the Chinese qmb139 engine and I used them in the lml 125cc 2t engine. Whilst watching a video on YouTube by a member here the skf made in India are not so good so check where made on here I think he goes by Dr or dk something and YouTube Mr freak ped if I remember rightly. If you can't find him get back to me and I'll look up his name on here or there. Does a good test on bearings.
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Post by FrankenMech on Oct 7, 2021 12:19:51 GMT -5
I have used SKF bearings for many years on different projects. The company has high QC standards no matter where they come from. Just get the right bearing for the application.
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Post by aeroxbud on Oct 7, 2021 14:01:20 GMT -5
I don't like the sound of "Glass fibre reinforced." I know stage 6 do a polymer cage version. But I prefer the metal cages, as you need to heat/freeze them to fit.
Those bearings look closed side versions. 🙈
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Post by yambw’s on Oct 7, 2021 15:37:11 GMT -5
I don't like the sound of "Glass fibre reinforced." I know stage 6 do a polymer cage version. But I prefer the metal cages, as you need to heat/freeze them to fit. Those bearings look closed side versions. 🙈 I’m using skf c4 I believe, I was under the impression they were the best? I got the metal cages for that very reason aeroxbud
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Post by FrankenMech on Oct 7, 2021 19:44:14 GMT -5
Getting the right cage/shield(s)/seal(s)/profile/materials are all part of specifying the correct bearing. Full sealed bearings may last longer than open styles when particulates enter the oil. Green Loctite bearing retainer may be better than press or shrink fits in certain applications. Bearing selection and installation is not easy.
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Post by x7rocks on Oct 13, 2021 22:20:17 GMT -5
I got a set of these bearings with the removable inner ring. Gonna test it with a 90cc engine build and see how it goes.
I believe 90gtvert can confirm one of these are the same bearings that came with the malossi rc one so it will be interesting to try.
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Post by 190mech on Oct 14, 2021 18:51:41 GMT -5
KTM and Aprilia use a roller bearing on the magneto side only,I think the ball bearing on the drive side keeps side to side movement in check..
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pewpew
Scoot Enthusiast
Posts: 254
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Post by pewpew on Oct 15, 2021 8:30:47 GMT -5
KTM and Aprilia use a roller bearing on the magneto side only,I think the ball bearing on the drive side keeps side to side movement in check.. Rc one uses one on the variator side only
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Post by x7rocks on Oct 15, 2021 12:13:55 GMT -5
KTM and Aprilia use a roller bearing on the magneto side only,I think the ball bearing on the drive side keeps side to side movement in check.. Which makes me wonder. How much play is inside the crank when it's all attached? So it will be interesting to see how both sides would work as far as crank play and such will work.
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Post by x7rocks on Oct 15, 2021 12:16:50 GMT -5
KTM and Aprilia use a roller bearing on the magneto side only,I think the ball bearing on the drive side keeps side to side movement in check.. Rc one uses one on the variator side only Yeah that's the bearing that I found the p/n for and wanted to see how it fits on a regular minarelli engine, I like the idea of being able to just slide a crank into an engine rather than heating and freezing (slight irony seeing I'm gonna need heat and cold to get the bearings in initially into the crank case) Anyone know how much play? I can't say these bearings have anything that "lock" them in place but definitely spins freely
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Post by 190mech on Oct 15, 2021 19:55:25 GMT -5
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Post by x7rocks on Oct 15, 2021 22:18:34 GMT -5
Sounds interesting. So I could have good luck with this, if I'm free this weekend I'll see if I can get a bearing removal tool from my 42mm crank and swap it over. To port the case or not is the question since it's all taken apart 🤣
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Post by ThaiGyro on Oct 16, 2021 14:47:19 GMT -5
I agree with the boys above regarding any SKF offering. The India thing seems a bit random or the person who claimed that got the info from who knows?
SKF has an unbelievable high quality control standard and rarely is there much deviation at their many, many, many plants. India built? Sure!! They have 5 or 6 different plants in India. A bearing gone bad from a manufacturing defect, while possible...maybe, but highly unlikely, me thinks. I believe that hey would have made good on that, if put forth.
Whilst in Thailand, we used them almost exclusively for motorcycle and scooters. Some were from their Thai plant in Rayong, but most came from India. (The SKF Rayong, Thailand plant primarily supported the motorcycle and cars plants in Southern Thailand, but also Suzuki and Honda in the greater Bangkok area.)
Thailand used to have shortages of bearings and other parts, during high production years, so the overflow was from India or China SKF. We did often buy ABEC 4 or 5 stuff from them or Lily, depending on cost.
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Post by 190mech on Oct 16, 2021 17:47:16 GMT -5
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