GS Inlet Pipes

Last modified 07/06/02

This page is intended as a guide to fitting GS inlet pipes to a R1100Rt. Fitting the pipes will take the average home mechanic 2 hours at most and save you a tidy sum of money!

   After fitting these pipes and checking the balance of the injectors I went for a spin, The change was immediately obvious.... "WOW that wasn't there before" There is now noticeable boost in power around the most used 4000rpm area, feels like a different engine. I bet the performance chip manufactures wish they could claim this sort of boost, most of there gains are in the higher rev range, just were you don't need it.

Graph

  Well, they say graphs and figures can be manipulated to say anything. so here goes..  I made up this graph from data found on the Web, it clearly shows a dip in Power & Torque at around 4000rpm for the Rs/Rt

Comparison

 GS & RT Pipes compared. Standard RT-RS inlet pipe is top, long GS pipe below, the extra length of the GS pipe goes in to the air box.

Fitting

Remove the seat and all the plastic from the sides of your RT and store it safely. Slacken fully the 2 hose clips that clamp the inlet pipe to the injector and air box. You can put a little thin oil (3in1) on the screws so as they undo they will work easier, The inlet pipe you can guarantee will be stuck to the rubber ring in the air box, I used a little silicon spray to ease it along once it was moving.

Push the pipes in to the air box a couple of inches. next slacken the hose clip that secures the injector to the engine, again it will probably be stuck. work it loose and pull the injector away from the engine. Pull the old air pipe out of the air box and insert the new longer GS pipe. make sure the correct pipe goes to each side. 

LEFT SIDE part number ends 405

RIGHT SIDE part number ends 406

Re-assembly is the reverse of the above BUT, do ensure the injectors are correctly seated on the inlet rubbers and firmly secured, you don't want an air leak here. Before you finish I recommend checking the balance of the injectors, beg, borrow or steal a pair of gauges. Balancing the R1100 engine is a pretty fine affair just like its Dad was the R100, just a 1/4 of turn of the cable adjuster makes all the difference, You should not need to adjust the tick over setting at all. Lastly of course put all the plastic back, check every thing is tight, then go for a spin.... you will be surprised!

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