fk dim 03 - bv pist

Untitled Document

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2010 CRF 250 (3295) [334]

fk dim 03 - bv pist

notice pist dimens for restackor

click [additional info] below image

bv pist
USD DFF SHOWA TC

vlpn [bi_vlpn_fbvpist]

SF.BVPIST35.250H10

done

sdpn fbvpist

SFCPH-10

[fbvpist dimens from]

2010 CRF 250

9.0

restackor dimens

<-- pist dimens restackor

pist dia [exact]

34.92

prel [inch]

0017 - 0021

a [w.port]

9.6

b [d.port]

9.0

c [width inner port]

4.0

d [w.seat]

.80

e [width trap hole]

4.0

f [ht of hole]

9.0

g [width of hole]

9.6

h [r.port]

5.5

j [width]

2.96

k [width]

m [width]

2.5

n d.thrt [calc]

holeDia = 8.8
d.thrt = 0

o N.thrt [= N.port]

nu ports = 4
N.thrt = 0

[calc pist od from dim]

[j+f+k+h+h+k+j+f]

34.92

d.thrt calc may be incorrect for oval, and check trap
consider a place to enter piston thick, or just use additional info

[comments]
[Reb deck ht 1.5]

* The 10 CRF 250 35mm bv pist is the same as KFCP-Y06 EXCEPT for the preload. The KYB piston has .0015 inch preload, this Showa piston has, f1 = .0017, f1 = .0021 prel. For that reason we gave this Showa piston a new vlpn.

Unrelated, but piston ports are very rough, need deburing.

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Record count 10 for bv pist
List of bikes with this part from bikeinfo table.
id's	bike
(883) [334] USD DFF SHOWA TC	2010 CRF 250
(3644) [647] USD DFF SHOWA-WP TC	2010 CRF SC 250
(1155) [345] USD DFF SHOWA TC	2011 CRF 250
(1341) [388] USD DFF SHOWA TC	2012 CRF 250
(1468) [417] USD SFF SHOWA TC	2013 KXF 250
(1617) [427] USD SFF SHOWA TC	2013 RMZ 250
(1618) [428] USD SFF SHOWA TC	2013 RMZ 450
(1623) [434] USD SFF SHOWA TC	2014 KXF 250
(1624) [435] USD SFF SHOWA TC	2014 RMZ 250
(1626) [437] USD SFF SHOWA TC	2014 RMZ 450

Untitled Document 2010 CRF 250
USD DFF SHOWA TC
not WP, this comment only pertains to WP forks

[bv pist img 240 x 420]

SF.BVPIST35.250H10

[additional info]

Untitled Document SHOWA bikes that have [additional info]
SF.BVPIST3325.450S06
SF.BVPIST39.250H15
SF.BVPIST23.250S04
SF.BVPIST35.250H10 *
SF.BVPIST37.250H13