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Post by charles13 on Feb 22, 2024 16:48:31 GMT 1
I picked up an 88 in pretty rough shape. I have some parts that I would like to use up and keep it looking like it was modified back in the day; 2ma wheels, DG pipes, fork brace, Triumph calipers (ground smooth ready for paint) and a Nitron shock. My immediate concern is with the 2ma wheels as they won’t accept the Triumph calipers and I’m not sure I want to cut the caliper mount off the left side fork, so… does anyone know what front wheel I can use that will bolt into the stock forks, work with the Triumph calipers and match the skinny 2ma back 17” wheel?
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Post by crogthomas on Feb 23, 2024 8:56:08 GMT 1
If you intend to use YPVS forks and Triumph calipers without a adaptor, you'll only be able to use the stock size 267mm discs. But there are a few other models in the Yamaha range that use the large mounting PCD for discs that you could fit the YPVS discs to. I'm not sure if the offset would be the same though, probably not as most of them will be wider. Plus you'll probably find that the front wheel is wider than the rear.
Since you have 2ma wheels, you'd probably be better off just using the larger disc that came with them and adapting your caliper to suit. Much better all round.
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Post by midlifecrisisrd on Feb 23, 2024 12:17:15 GMT 1
An LC disc is 267mm and should be same bolt pattern as 2ma
Steve
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Post by charles13 on Feb 23, 2024 15:06:51 GMT 1
Ya that’s kind of where I was going; getting a nice big caliper and chopping the mount off (the left fork leg of a 45 year old bike). I kind of wish there was a 17”, 3 spoke, dual disc, narrow wheel that would have bolted into the rz forks. Oh well the 2ma wills will not only look period but perform very well.
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Post by midlifecrisisrd on Feb 23, 2024 15:29:36 GMT 1
The only similar wheel is a Jap RZ250 3HM1 1988 front wheel
Same pattern, 2.15 rim and twin disc
The yokes have 10mm extra between fork centres
I'll get a pic
Steve
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Post by midlifecrisisrd on Feb 23, 2024 15:34:31 GMT 1
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Post by charles13 on Feb 23, 2024 16:05:43 GMT 1
I did see that in my researching through the builds thread but I cannot post pics until I get my Tapatalk sorted. Please tell me what front wheel that is? and/or is that a whole new front end? |
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Post by jon on Feb 23, 2024 16:09:16 GMT 1
The only similar wheel is a Jap RZ250 3HM1 1988 front wheel Same pattern, 2.15 rim and twin disc The yokes have 10mm extra between fork centres I'll get a pic Steve I think that the FZR 250 and TZR 250 3MA is the same wheel to widen the search? Jon |
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Post by midlifecrisisrd on Feb 23, 2024 16:10:31 GMT 1
It's a complete front end that is specific to the 1988 JDM model
Only other front end I'd an r1z-250 which I think is a 2.75 front rim with a 110 tyre
3hm1 was 100/80 17
Steve
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Post by midlifecrisisrd on Feb 23, 2024 16:12:02 GMT 1
I thought the 2kr fzr250 wheel was the same but single disc
I thought the 3ma was a wider hub
Steve
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Post by dusty350 on Feb 23, 2024 18:21:07 GMT 1
What about different yokes ? I've got a pair of Fzr250 yokes which have a slightly wider offset than the standard Pv yokes but are still 35mm diameter. I wonder if you could then use your Pv forks but with a different 3 spoke wheel like an Fzr250. There is a complete 250Fzr 3L1 front end on ebay at the mo - 186222712096  |
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Post by midlifecrisisrd on Feb 23, 2024 19:18:01 GMT 1
FZR250 2KR yokes are what is on a 3HM1
Steve
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Post by charles13 on Feb 23, 2024 21:39:01 GMT 1
What about different yokes ? I've got a pair of Fzr250 yokes which have a slightly wider offset than the standard Pv yokes but are still 35mm diameter. I wonder if you could then use your Pv forks but with a different 3 spoke wheel like an Fzr250. There is a complete 250Fzr 3L1 front end on ebay at the mo - 186222712096 I found this: Yamaha Fzr250r 3ln Front Wheel With Tyre And Disc Brakes Good Bearings Could I use this with the wider triples? |
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Post by dusty350 on Feb 23, 2024 21:48:18 GMT 1
Yep, I had a complete front end off a 3HM1 on a 400 hybrid I built;  bike 26-2-09 009 by dusty miller, on Flickr  very last 400e pics 003 by dusty miller, on Flickr The wider offset might allow for standard forks to be used with a wider, non Ypvs wheel like the Fzr250 wheel, or another 3 spoke Yam wheel with the same spoke width and pattern maybe ? The complete front end for 200 quid doesn't look a bad prospect, but add in a rechrome, and rebuild, coz it does need it, and then it starts getting expensive ! And it's collect from North London, and I think Charles might not be local  Oh the joy of specials !!  |
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Post by charles13 on Feb 23, 2024 22:03:04 GMT 1
Dusty, would you sell those triples?
I haven’t been able to determine if the discs from the 3ln are the same diameter as the rz but it’s looking promising!
I’m assuming the wheel hub is wider because of the opposed pistons on the calipers, if I used the Triumph calipers could I just machine the disc mounts down a couple mm and maybe use the stock triples?
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Post by abar121 on Feb 23, 2024 22:29:15 GMT 1
I also clocked that ebay FZR250 front end. Not far for me, but just not worth it with pitted forks.
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Post by oldelsieboy on Feb 23, 2024 22:47:02 GMT 1
I haven’t been able to determine if the discs from the 3ln are the same diameter as the rz but it’s looking promising! 3LN discs measure 282mm dia OEB |
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Post by charles13 on Feb 23, 2024 22:53:15 GMT 1
15mm bigger, hmm… maybe the rz discs would bolt up?
Edit: I may have figured it out the 3ln discs are bigger but also dished (see Dusty’s pictures above) so… the 3ln wheel may bolt up to the rz350 forks and be able to use the rz discs and triple clamps. It’s a bit of a shot in the dark so I still need help here.
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Post by dusty350 on Feb 24, 2024 8:57:02 GMT 1
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Post by charles13 on Feb 24, 2024 13:01:41 GMT 1
That’s handy, what’s pcd? I assume it’s the distance between 3 bolt holes (inclusive)? |
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Post by jon on Feb 24, 2024 13:40:00 GMT 1
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Post by charles13 on Feb 24, 2024 14:25:15 GMT 1
Thanks for all the replies but I’m overthinking this, I’m just going to do what someone would have done in the day; mount the wheels and do what’s needed to adapt them, the back wheel may not take much and the front wheel will just need a home made caliper adapter. The inevitable sad part will be the cutting off of the left side caliper mount.
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Post by midlifecrisisrd on Feb 24, 2024 14:43:30 GMT 1
Good info there Jon, also handy to know 3ma front was 2.75 👍 Steve |
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Post by jon on Feb 24, 2024 16:31:15 GMT 1
Good info there Jon, also handy to know 3ma front was 2.75 👍 Steve I’m only going by what the guy told me the wheels were? But the rear is definately 3MA, so I can only assume the front is? Jon |
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Post by charles13 on Feb 27, 2024 3:13:59 GMT 1
Well I stumbled across another option for using the nice light 2ma wheels on this 88, an entire 2ma front end, the forks look sturdier than the rz forks and they come with the brake caliper and triples. Seeing as this front end is a year older than the rz I am not sure that it could possibly be any better. I’m going to try and read up on the tzr as we never got it over here, does anyone here have experience with these forks? It will at least save a good set of rz forks.
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Post by urbantangleweed on Feb 27, 2024 7:29:53 GMT 1
Well I stumbled across another option for using the nice light 2ma wheels on this 88, an entire 2ma front end, the forks look sturdier than the rz forks and they come with the brake caliper and triples. Seeing as this front end is a year older than the rz I am not sure that it could possibly be any better. I’m going to try and read up on the tzr as we never got it over here, does anyone here have experience with these forks? It will at least save a good set of rz forks. That might be a very good plan assuming you can find a complete 2ma front end. |
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Post by charles13 on Feb 27, 2024 14:56:56 GMT 1
Well I stumbled across another option for using the nice light 2ma wheels on this 88, an entire 2ma front end, the forks look sturdier than the rz forks and they come with the brake caliper and triples. Seeing as this front end is a year older than the rz I am not sure that it could possibly be any better. I’m going to try and read up on the tzr as we never got it over here, does anyone here have experience with these forks? It will at least save a good set of rz forks. That might be a very good plan assuming you can find a complete 2ma front end. I’m making an offer on one, I’m just hoping this is an upgrade to the stock rz forks. I’ve been reading Sydney81’s build which is one of my favorite of all time and he had some 2ma forks on his air cooled and mentioned that they where too long, but that’s all I’ve found on them so far. |
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Post by freddie19 on Feb 27, 2024 20:48:38 GMT 1
Sturdy as well at 39mm, same size as on my 900F.😁
They are quite long due to the clip ons, 640mm stanchions I think!
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Post by charles13 on Feb 27, 2024 22:24:28 GMT 1
Sturdy as well at 39mm, same size as on my 900F.😁 They are quite long due to the clip ons, 640mm stanchions I think! Well, if they stick up above the top triple I should be able to find a set of clipons that will clear the stock fairing, and sturdy is good. I haven’t heard back to see if I got them yet but I am pretty sure they will be headed my way. I think the lightweight 2ma wheels will be a big improvement on their own. |
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Post by dusty350 on Feb 28, 2024 6:41:02 GMT 1
You can swap the 2ma clip ons over - left to right and vice versa. Instead of being angled downwards they sit more upright. Certainly more comfortable for old joints, and will help with fairing clearance. Did it on my 2ma/pv, and I reckon it made the bar weight end of the clip ons 3 inches higher, and evens out the angle to a flatter level;  er 016 by dusty miller, on Flickr It does adversely tip the stock master cylinder, but that never caused an issue. |
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Oh the joy of specials !! 
