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Throttle Help 2003 CR125R

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I have a friend who bought a used 2003 CR125R several years back. He pretty much left it at my house about 4-5 years ago / has never ridden it since so I'm basically considering it my spare bike to take any of my friends riding whenever I need a riding partner who doesn't own their own bike. He's okay with that and I told him I'll fix what is needed, etc. Last time I the bike was ridden was about 3 years ago. I had replaced the throttle housing with some cheap Motion Pro item because the tube the grip covers was all chipped and cracking. I don't remember if it was ever ridden with the new MP throttle, but the throttle was kind of sticking / just not returning. It was so long ago, I'm thinking I just said screw it until a later date (and now it's that date). So, I just bought new Boyeson reeds, a FMF Spark Arrestor, DID Chain, Air Filter, Some misc OEM parts, carb return spring, and Motion Pro throttle cable (part 02-0384) [stock cable just didn't seem all that smooth after cleaning and lubing]. I tried putting the cable into the throttle housing and with all the adjustments (top of carb and throttle housing) maxed, I still have about 1/2-3/4" play. I'll mess wiht it some more, but I'm pretty sure I had the throttle in the housing properly. I'm guessing I will just have to buy a better throttle; any suggestions on a replacement. I can't find any of his old OEM throttle parts, and buying new OEM would be pretty spendy. I have probably spent about $300 on his bike recently and don't really feel like spending any more right now if I don't need to.

Another option could be that if I take my throttle from my 2004 CR250R and place it on his 03 125R (would that work - cable length, etc.,), and I could get me something a lot better (I'd rather do that than buy him a real good one).

I have pretty much done all my own work, suspension / motor, etc. for 25 years.. this is just kind of irking me.

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I'll check that tomorrow. I'm kind of thinking the OEM Honda Throttle assembly sucked up that other half inch or so. I think the ends of the cable are at the correct length, it's just the cable jacket is too short.

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