[JohnnyW]

Hi Guys, my first post on here and looking for some clarification. I'm planning on upgrading my front forks with the YSS emulator valves (and yes, I will be drilling the damper rods but slightly confused by the information on the TEC Bike Parts website. The full YSS kit available elsewhere does not include adapter rings to fit the emulator valves to the top of the damper rod. TEC have the emulator valves available on their own which is all I need as I have already fitted preload adjusters to the forks. However, they supply their own adaptor rings with the emulators and state that the rings must be fitted along with the emulators to enable them to work correctly and if not fitted may cause damage to the valves. I've read most of the threads on fitting the emulators and don't recall adaptor rings being mentioned. I also used to own a Yamaha TDM850 fitted with Race Tech gold valve emulator and there was no adaptor ring fitted, the emulator sat directly on top of the damper rod.
Are TEC correct in stating that the emulators need the adaptor rings to work correctly or are can I safely bin the rings and just fit the emulators straight onto the top of the damper rods.

Thanks 

[deadbat]

Hey, welcome to the forum.

I'm not sure what TEC instructions are, but I was under the impression that the YSS kit includes everything you need for the assembly.
Check this video https://www.youtube.com/watch?v=-EqB2hKXRw0, hopefully it will be helpful.

[deadbat]

Ignore my previous post. Being very tired after a long day I've totally misread it. You were asking about emulator valves not the whole kit.

My apologies.

[JohnnyW]

I've manage to work out why the TEC emulator needs an adaptor ring after checking the pics on the websites and reading the blurb. They are made by YSS for TEC but are to a slightly different design to the one in the YSS kit. They are not as deep as the one supplied in the kit and so require the adaptor ring. You can see by looking at the pics that the one supplied in the kit is much deeper and so does not require the adaptor ring.
My intention was to use the stock springs with the emulators but hadn't realised the stock springs were progressive rate. I prefer having linear rate springs with them, the same as I had in my TDM so I'll probably go for the full YSS kit after all.

[MartinThailand]

This is the emulator from my YSS front fork kit. You can clearly see the adapter ring fitted to the emulator. The ring was a very tight fit so you might think it was a single piece with the emulator. This was a kit bought in Thailand but I can't imagine why kits from other countries might be different, unless the kits have changed in the 2 years since I fitted.

[JohnnyW]

This is the emulator from my YSS front fork kit. You can clearly see the adapter ring fitted to the emulator. The ring was a very tight fit so you might think it was a single piece with the emulator. This was a kit bought in Thailand but I can't imagine why kits from other countries might be different, unless the kits have changed in the 2 years since I fitted.

Thanks for the photo, Martin. TEC aren't selling the YSS kit, they are just selling the emulator. According to their website YSS make this unit for TEC but it doesn't come with the YSS adaptor ring and TEC supply their own adaptor ring.

[Hoiho]

You can see the separated emulator and adaptors at this site: https://roadpowercustoms.com/shop/ols/products/yss-fork-upgrade-kit-for-royal-enfield-650s  (BTW, Hitchcocks sell the kits).

I too already had decent preload adjusters and Racetech linear springs, so the valves were all I needed. Didn't trust the TEC plastic rings to make a tight seal, so I made adaptors and faced the damper rods for better seating.

Bit of work, but it's worth it. Rode my mate's Intercepter the other day and almost felt seasick afterwards.

[NVDucati]

You can see the separated emulator and adaptors at this site: https://roadpowercustoms.com/shop/ols/products/yss-fork-upgrade-kit-for-royal-enfield-650s  (BTW, Hitchcocks sell the kits).

I too already had decent preload adjusters and Racetech linear springs, so the valves were all I needed. Didn't trust the TEC plastic rings to make a tight seal, so I made adaptors and faced the damper rods for better seating.

Bit of work, but it's worth it. Rode my mate's Intercepter the other day and almost felt seasick afterwards.

+1 Excellent

[JohnnyW]

You can see the separated emulator and adaptors at this site: https://roadpowercustoms.com/shop/ols/products/yss-fork-upgrade-kit-for-royal-enfield-650s  (BTW, Hitchcocks sell the kits).

I too already had decent preload adjusters and Racetech linear springs, so the valves were all I needed. Didn't trust the TEC plastic rings to make a tight seal, so I made adaptors and faced the damper rods for better seating.

Bit of work, but it's worth it. Rode my mate's Intercepter the other day and almost felt seasick afterwards.

I don't have a set of linear springs yet so by the time I buy the emulators from TEC and a set of springs from someone else and pay for two lots of delivery charges, I might as well buy the complete YSS kit. Total cost will be about the same and it saves me having to cut down the spacers. 
I'll definitely use your tip and clean up the top of the damper rods prior to fitting the emulators to get a good seal. I see that you only have two larger holes drilled in each damper rod. I know this is the subject of great debate with people advocating anything from 2 to 6 holes for the damper rod so would be interested in hearing you reason for only going with 2. What size did you drill, they look a bit bigger than the 8mm that is usually suggested?

Cheers,

[Hoiho]

I don't have a set of linear springs yet so by the time I buy the emulators from TEC and a set of springs from someone else and pay for two lots of delivery charges, I might as well buy the complete YSS kit. Total cost will be about the same and it saves me having to cut down the spacers. 
I'll definitely use your tip and clean up the top of the damper rods prior to fitting the emulators to get a good seal. I see that you only have two larger holes drilled in each damper rod. I know this is the subject of great debate with people advocating anything from 2 to 6 holes for the damper rod so would be interested in hearing you reason for only going with 2. What size did you drill, they look a bit bigger than the 8mm that is usually suggested?

Cheers,

8mm, flowed, on advice from RaceTech/YSS supplier (Robert Taylor from KSS).
"If you add further holes up the damper rod you are increasing the sweep area where there is absolutely no high speed rebound damping . I collared Paul Thede (designer of original RT emulators) about this when he stayed with me a dozen or so years back and he conceded I was correct. You need to just oversize the holes that are there".

[JohnnyW]

8mm, flowed, on advice from RaceTech/YSS supplier (Robert Taylor from KSS).
"If you add further holes up the damper rod you are increasing the sweep area where there is absolutely no high speed rebound damping . I collared Paul Thede (designer of original RT emulators) about this when he stayed with me a dozen or so years back and he conceded I was correct. You need to just oversize the holes that are there".

Well, that will simplify things, thanks for that.

[VivianzRamsey]

Hey, welcome to the forum.










Nox Vidmate VLC

[JohnnyW]

Hey, welcome to the forum

Thanks.