hi guys just baught replacement forks for my fzr400 1wg 87 . forks seemed the same fitted them ok all done til i tried fitting the calipers back on . the new fork caliper lugs are 10mm further apart . any ideas which caliper i need and will it slot straight on . which model they'd be off ? i really want to keep these forks as they are adjustable have ohlins internals and i just bloody painted them lol..... any help much appreciated cheers

An 87 would be a genesis (twin headlights with no air intakes) I think they have 38mm dia forks.

Now it gets tricky, I think you might have fork that take a 100mm caliper bolt spacing - measure this and confirm it before you get calipers. Here's a tip, don't try to measure centre to centre measure from the bottom or top of the hole to the corresponding part of the other hole.
If you get 100mm then be happy cos a Yamaha Blue spot (or gold spot) will bolt straight on !!!
Now check the brake discs are the right size, later bikes used a 298mm dia

opps - you can use the R6 / R1 calipers they come in two types some have slightly smaller dia pistons I think it's 34 / 38mm these are probably better for a 400. Blue spot calipers are standard issue on just about all modern Yamahas

evil chicken i thank you ....... the space is 100mm between them have been eyeing up the calipers on my missus trx850 write off but she caught me lol ...... ok so going to look at getting standard r6 calipers but bit worried bout discs but then again im guessing its r6 discs ? im no techno wizard im afraid but give me a paint gun and i am pretty handy ......

are the discs you have totally flat or do they have an offset? i think the genesis used 'flat' discs (might be wrong though!) so the offset may be wrong when you fit the calipers. I've got a set of flat discs somewhere if you end up needing them.

cheers taggy ,i think there is some difference in the offset too . when im good with calipers i'll get back to you . im a little clueless on what to do but will get there . im a painter with some mech knowlege but not very tecnichal lol

A painter's useful to know - where abouts are you ?

The discs won't be R6 beause the R6 wheel is different

im in leicester fella , far from you ? been doing the job for year ...... i took a look on fleabay and sussed the wheel thing . but cheers for replying .....

menat say been doing the job years not a year . going to do marlboro yamaha scheme on my little genesis......

Sounds nice ... pics before and after please

will do mate might be a while tho have to do total rebuild on my missus trx then i get the bike back from her when trx is back on road ....