RGV braced swing arm with NK Racing kit. Rear wheel centre?

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JonW
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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#16 Post by JonW » Wed Jul 23, 2014 1:01 am

all very strange, and if its all RGV and all fits in then I just dont see how it can be so far out, unless its bent, hmm? when you adjust the adjusters to the same mark, and run a line (a long straight edge) along each side of the wheel, are those lines straight towards the front of the bike?
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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#17 Post by Stink_wheels » Wed Jul 23, 2014 1:38 am

I've knocked the bearings are out of the rear wheel now but yes, once the new ones are in I will be clamping some straight edges to the rear wheel and checking it to the front to get an actual measurement. Just roughly eyeballing it, it looks like it needs to come across a little under 10mm to the left. This brings the left edge of the tyre awfully close to the inside of the swingarm at the front though.
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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#18 Post by seahorse » Wed Jul 23, 2014 6:29 am

id measure the tube while your at it.
81 RD 250 LC Hybrid .Widened frame with Aprilia RS250 Back end & Front end, strokd RZ 421, Kennys TSA's, 31KVM26SS Carbs M-360 P-25 ALBA Ndl Pos 3, Air 1.3/4
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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#19 Post by Stink_wheels » Wed Jul 23, 2014 7:32 pm

Yep inner spacer looked fine, pressed in new bearings right side first... And no change haha. Cush drive spacer looks perfect too. Next step, check rear to front with a straight edge and make custom spacers. I thought this was a simple bolt in conversion! Haha

Curiously I found a chap had posted on some RGV forums who had this exact issue with his RGV. The wheel was 10mm to the right of the centre line, same as mine. His ended up being someone had the swingarm pivot spacers wrong apparently? With the RGV swinger in an RZ frame it fits snug and can't move left or right at the front though?
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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#20 Post by JonW » Wed Jul 23, 2014 8:38 pm

I still reckon that if you fit the spacers and it all fits in without too much leeway then its probably 'right', that would mean that the swinger is off, either at the pivot or its twisted.

I get the point that these parts are all made on machine and have tolerances but not this much. So long as youre using the right spacers, wheel, sprocket carrier/cush and brake hanger then the wheel is where it needs to be in the arm. That can only mean the arm is the bit at fault, unless the frame is bent...

I will drag out my spacers today and measure them for you...
Last edited by JonW on Wed Jul 23, 2014 8:54 pm, edited 1 time in total.
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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#21 Post by JonW » Wed Jul 23, 2014 8:53 pm

Reading back through this I think I may have found something I was wrong about on the RZ, it only applies to the LC which has a thinner swingarm pivot area necessitating grinding some of the swingarm down... see below:
Stink_wheels wrote:
JonW wrote:
We always take the same amount off each side of the singer pivot...
What do you mean by take the same amount off each side of the swinger pivot? With the kit I was supplied by NK there was no mention of modifying the swingarm and the pivot end of the swingarm slotted straight into the frame with no material taken off it? Just some new bushes were provided to accommodate the smaller diameter of the standard RZ pivot shaft sitting in the Suzuki bearings?
Looking again at the online pdf plans it seems that losing the spacer shims takes the swinger pivot down from 210mm to 208 which is close enough to fit in the RZ (206.9mm) frame. so my bad, its an LC thing, not RZ.

This also means that if the pivot of the frame and the swinger are correct then it has to be either:

1 - bent swinger
2 - spacer issues

Im basing that on Sir Arthur Conan Doyle's assertion attributed to Sherlock Holmes, 'Eliminate all other factors, and the one which remains must be the truth.'
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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#22 Post by JonW » Wed Jul 23, 2014 11:23 pm

Ok, measured the spacers and my two end ones both measure 20mm like yours. The cush drive spacer is 50mm. HTH.
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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#23 Post by nikfubar » Thu Jul 24, 2014 6:10 pm

I agree with spacer dimensions, if you have the correct width bearings & it all fits snugly between the wheel adjusters it should all be correct, then it's a matter of clamping straight edges to the rear rim & check alignment with the front wheel. You obviously need to make sure that the dimension between the straight edge & the front & back of the front wheel rim are the same on both sides. If not adjust the rear wheel until they are then take a look at the rear wheel, it should look right with roughly the same amount of clearance between the rim & the swing arm at the pivot end. This is the other reason you can only tell the front offset sprocket size required after you have done this. If things don't look right with the front & rear wheels aligned something is bent or twisted.
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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#24 Post by JonW » Thu Jul 24, 2014 8:14 pm

+1 on Niks info.

Also been meaning to ask Stinky (couldnt resist!) what bars are those?
80 XT500 Supermoto!
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
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86 RZ350 F2 Hybrid

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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#25 Post by Stink_wheels » Fri Jul 25, 2014 8:04 am

Thanks for all the help guys! Pulled out the sprocket spacer, that checked out the same as yours, Jon. Anyway, I decided to keep going and pull it all apart...

I don't want to get too excited until I check it properly with a couple straight edges but it's looking pretty good! When I originally fit up the swingarm, I left the standard RGV front chain guide on it temporarily and didn't really give it a second thought. Well it looks like the fact that it was a little too wide without the RGV spacers in place was enough to skew the swingarm when bolted tight, which was exaggerated at the other end of the swinger. It basically twisted from the front with the dog bone mount being the sort of pivot. Being soft rubber I didn't expect that but after removing it and cutting it down and refitting everything else as it definitely looks to be the cause and just by eye its looking great. Will measuring it later though to make sure it's perfect.

Glad it seems to be the case, as we were all saying it didn't make sense to have to make new wheel spacers when others havent!

Jon, the bars are Easton motocross bars :smt001 They're Protaper style 1 1/8inch bars which were a little tricky to find fat clamps to suit - which looked good and were tall enough to clear the forks! Ended up going with some Rizoma clamps and I'm stoked how they turned out
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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#26 Post by JonW » Fri Jul 25, 2014 9:19 am

ahha! well that would account for the issues!

Cool on the MX bars, I have Renthals on my LC and some fat TAGs on my XT, I just love the look and feel of the things LOL!
80 XT500 Supermoto!
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid

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Re: RGV braced swing arm with NK Racing kit. Rear wheel cent

#27 Post by Stink_wheels » Fri Jul 25, 2014 9:41 am

Yeah previously I've ran similar bars on my FZ1N and Street Triple too, always liked the style and feel!
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