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Re: Hybrid project
Posted: Sat Aug 18, 2018 12:41 pm
by Gerrit
Next job: the swingarm. I have a vj22 RGV rear wheel; this came with the axle, which is 20 mm, the KR-1S axle is 17 mm. According to my digital kitchen scales the RGV axle weighs 357 g, the KR axle 547 g. The choice is either use the KR axle and having it drilled hollow, or use the RGV axle which is already hollow. As the stiffness of a shaft increases to the fourth power with the diameter increase, I will use the RGV axle rather than having the KR part drilled. This, however, means filing the slots in the swingarm for the axle to take the larger RGV part, but this only cost my time and effort (plus rude language- I loathe filing!) whereas I have to farm out the drilling (which even at mate's rates costs Euros) as I no longer have access to a lathe. Also, the chain adjuster blocks will have to be modified to take the RGV axle, this is a job for my expandable reamers.
To paraphrase the Bangles, "File away, file away, file away....."
Re: Hybrid project
Posted: Sun Aug 19, 2018 3:22 pm
by Gerrit
The chain adjuster blocks now fit the RGV axle:
The RGV axle is slightly longer than the 1S axle, but two M20 washers take care of the difference.
Re: Hybrid project
Posted: Wed Aug 22, 2018 8:49 am
by Gerrit
First step in modifying the axle slots is to mark the area around the slot with a marker pen, then add the outline of the slot's new shape (on both sides of the slot of course):
Getting there. Remaining work to be done with the help of a Dremel multitool:
Re: Hybrid project
Posted: Wed Aug 22, 2018 9:58 am
by dmac
For someone that claims not to like filing, you are doing an awful lot of it
Keep up the good work, it's nice to see a performance build - and the differences in assemblies between manufacturers.
Re: Hybrid project
Posted: Wed Aug 22, 2018 11:26 am
by Gerrit
Actually, I DO loathe filing, but unfortunately it can't always be avoided.
Perhaps I should change the title of this project from "Hybrid" to "Mongrel" as it will really be a mix of stuff- KR-1frame, 1S swingarm, RGV bits, TZ pieces, ZXR odds, KX125 sods etc etc. Stir well- and hope for a good result.
Re: Hybrid project
Posted: Tue Aug 28, 2018 4:36 pm
by Gerrit
First slot is finished:
Next step, "Repeat procedure for second slot."
Re: Hybrid project
Posted: Fri Aug 31, 2018 11:45 am
by Gerrit
According to my digital kitchen scales the RGV rear caliper carrier weighs 274 g, the KR caliper carrier and torque arm 774 g. Assuming the RGV and KR calipers are very similar if not identical, this gives a saving of 0.5 kg of unsprung weight.
Part of the weight difference is caused by the needle bearing setup of the KR carrier, which is not required for the RGV setup as the RGV caliper does not rotate around the axle but merely slides backwards or forwards as the chain is adjusted.
Re: Hybrid project
Posted: Tue Sep 04, 2018 3:26 pm
by Gerrit
Only some trimming in the corners of the RH slot to do, but otherwise the job's finished:
Re: Hybrid project
Posted: Sun Sep 09, 2018 11:39 am
by DougB
Nice work, good to see how it's coming long.
Re: Hybrid project
Posted: Sat Sep 15, 2018 5:59 pm
by Gerrit
I received a set of aluminium spacers for my RGV rear wheel today.
The LH spacer needs its width reduced to 10 mm, the others can be used as delivered. Once that is done I can confirm the width of the spacer between caliper carrier and swingarm, which I've calculated provisionally as 6.3 mm.
Re: Hybrid project
Posted: Sun Sep 16, 2018 9:22 am
by JanBros
Re: Hybrid project
Posted: Sun Sep 16, 2018 2:56 pm
by Gerrit
Are you using the RGV caliper carrier or the standard KR caliper carrier and torque arm, Jan? I'm using the RGV carrier, which is 30 mm wide; the KR carrier is 41 mm.
Re: Hybrid project
Posted: Sun Sep 16, 2018 4:18 pm
by JanBros
that explains the difference perfectly
Re: Hybrid project
Posted: Tue Sep 18, 2018 9:33 pm
by Gerrit
To replace the vj22 RGV fork yokes I obtained ZXR400L yokes. The upper yoke before.......
and after modification- the ignition lock won't be needed.
A bush has to be made to reduce the bore for the steering stem from 25 to 18 mm.
Re: Hybrid project
Posted: Wed Sep 19, 2018 1:40 pm
by Gerrit
ZXR400L lower fork yoke after removing the steering stem:
KR-1(S) (upper) and ZXR400L (lower) steering stems:
As the ZXR stem won't fit the KR frame the KR stem will have to be fitted to the ZXR yoke instead. To accept the KR stem a bush will have to be made to take up the difference in diameters between the stems.