I HAVE A 86 250R. WILL TCS BE ABLE TO DO A 'SCS' CONVERSION TO IT? HAS ANYONE HAD THIS DONE?

 

They should be able to convert the rear. The stock fronts are not a rebuildable shock. If you have works shocks up front they can. I had works tripple rate fronts and I sent them and my stock rear in. The converted both to SCS. They work great. I only had like a week wait,and the price is unbeatable. I just havent figured out why my rear is so springy and bouncy. I need to adjust something, but I just havent done it yet. I have their phone number out in my shop if you need it.

 

CTBanshee,

Did you get the dual or single rate conversion in the rear? I've heard that the single makes it really bouncy. That's just what I've heard though. I honestly didn't know they did a single rate conversion for the rear.

 

i have the dual conversion on my banshee its bounce also but when you sit on it and ride it doesnt seem to bother it

 

would you guys suggest the rear conversion on a 400ex? is it more trouble that it's worth or what? thanks.

 

Same with mine. I dont really know how these zero preload type shocks are supposed to be. I have only ridden with them once since I got them and that was a race. But your right, it doesnt seem to effect the ride.

 

TCS can't perform an SCS 'dual-rate' conversion on the stock 250R shock quite yet, but they can on the 400EX. I have 2 buddies that had their stock 400EX rear shock revalved by TCS, and both included an SCS conversion.

 

When I had my shocks converted last year, I was unable to get the dual springs on the rear. (Ohlins body). I was told that TCS would be manufacturing a part this past summer to complete the conversion. But I have not checked into it since last spring. Is it out yet?

 

I too was wondering if TCS or PEP could change a stock 250R rear shock into a dual rate zero preload. I did a little experimenting with my shocks because I was lucky enough to have some ZPS shocks. When you get a total rebuild on a 250R rear shock, they usually use an Eiback spring. The springs are quite a bit shorter than the stock springs. In my opinion there is enough room on with a new spring for a PEP ZPS spring to be inserted. There is definitely not enough room for a TCS ZPS spring on the rear. Also, the 86 bodies have a few more threads on the body, so that helps too. Now the bad news. I talked to Wayne at PEP about this because I was planning on modifying my rear shock myself. He said that they do this mod on TT shocks but not MX. The reason is that the shaft is not strong enough to take the stress. Basically, the tensile stress of the PEP shaft is like 10X greater than the stock shaft. He didn't really tell me what happened when the shaft's on a stock 250R failed. I was thinking about it and I came to the conclusion that the shafts would bend very easily. It seems that this would happen for 2 reasons. First, on a stock linkage rear end the shock is not positioned perfectly vertical. Therefore, as the shock is compressing after a jump it basically blows through the travel of the ZPS spring on top. To compensate, the mainspring must be considerably stiffer. I figure that since the spring is so stiff, it won't compress fast enough. All that force has to go somewhere and it is applied to the shaft which can't withstand the pressure so it bends. I have seen 250R rear shocks with the dual spring conversion before. The mainspring is actually cut so that a TCS type spring can be inserted on top. Actually, someone that races here in Michigan had his done by GT Thunder. I personally think it looks sloppy and I don't really like the setup. However, he claims that he has never bottomed it out and he is in the A-class. I imagine that the mainspring is ungodly stiff since it was cut and that stiffness increased. However, this rider that I am referring to has got to be well over 200lbs so I am sure he can deal with it.

As for you riders that have "bouncy" rear shocks, that is wrong. That is a symptom of the spring over powering the valving or else a lack of pressure. The shock should not bounce at all. I hope you contact TCS about that problem and get it solved. Your shock could probably perform much better if that were fixed.

 

Do you all think that you could just play with the rebound and solve this "bouncing" problem on the TCS rear?