My 94 GSR was only cranking intermittently(new battery);Googled and read that the starter solenoid goes bad and the ENTIRE Nippondenso starter must be replaced(according to the Haynes manual) for BIG bucks.Then I found a place that sells solenoid rebuild parts kits;for 24.95 + $5 shipping.Ordered one online Nov 4th,,got it the 16th. It's 3 parts,2 contacts and a new solenoid plunger.
The pipe from the air filter box to the throttle body must be removed to access the starter.I have a CAI,so that was not as much trouble to pull.
The hard part was getting the starter out;the bottom bolt,a LONG one,did not want to break loose,and naturally,there was not much room to work in. After that,it was easy replacing the bad parts. The 2 contacts were badly eroded (1/2 as thick as original!) and the plunger copper ring was pitted.
If anyone is interested,the company is Nation Bros. Auto Electric in Missouri.
I just LOVE the Internet 8-)