GT500 Right part, wrong part?

jackyman · Posted: Sat Oct 16, 2010 9:36 am Post subject: GT500 Right part, wrong part?

I'm working on the front end of my '76 GT500 and looking to replace the bushes on the steering stem head. I ordered some replacements but on closer inspection I find that the bore to take the handle bar clamps is undersize 10mm as apposed to 12mm. I actually have another steering stem head which is exactly the same. I have spoken to another parts supplier and they say the spares I have are what they have to.
Anyone out there any idea whats going on, and can I get a part to match my handle bar clamps?

Bikegeezer · Posted: Sun Oct 17, 2010 6:04 am Post subject:

10mm is what's specified. I know the threads of the bolts are 10mm, but I've forgotten whether the bolt is shouldered up to 12mm above the threads. Is that the case?

Stu

dorT500 · Posted: Sun Oct 17, 2010 6:58 am Post subject:

jackyman · Posted: Sun Oct 17, 2010 2:18 pm Post subject:

The same here, threads are 10mm with the shoulder stepping up to12mm. I have 2 sets of handlebar clamps both the same , 1 set of the original bike and 1 off a donor frame. Could it be that was some sort of cross-over point between models?

Bikegeezer · Posted: Sun Oct 17, 2010 2:41 pm Post subject:

Right. That's for the T500. The GT500 has different (smaller) sized bushings and different sized handlebar holder bolts. The bushings for the T500 don't show as a separate part from the fork top bridge - no part number. I had a customer in here last week who handed me a pair of bushings he got on eBay for his T500 and wanted them installed. They were part # 09319-10009. Too small to fit his T500.

Stu

Part # = 09319-10009
Part Description = BUSHING 10X23X35
Model Count = 55
AC100 1969 100 AC100 SCRAMBLER DIRT
AS50 1969 50 SPORT AS50 STREET
A100M 1976 98 A100 STREET
GS450GAD 1983 448 GS450GA STREET
GS450GAF 1985 448 GS450GA STREET
GS450GAZ 1982 448 GS450GA STREET
GT380-B 1977 371 GT380 SEBRING STREET
GT380A 1976 371 GT380 SEBRING STREET
GT380J 1972 371 GT380 SEBRING STREET
GT380K 1973 371 GT380 SEBRING STREET
GT380L 1974 371 GT380 SEBRING STREET
GT380M 1975 371 GT380 SEBRING STREET
GT500A 1976 492 GT500 TITAN STREET
GT500B 1977 492 GT500 TITAN STREET
GT550-B 1977 543 GT550 INDY STREET
GT550A 1976 543 GT550 INDY STREET
GT550J 1972 543 GT550 INDY STREET
GT550K 1973 543 GT550 INDY STREET
GT550L 1974 543 GT550 INDY STREET
GT550M 1975 543 GT550 INDY STREET
RB50H 1987 50 RB50 GAG GSX-R50 SPORT
RV90A 1976 88 RV90 ROVER DUAL SPORT
RV90B 1977 88 RV90 ROVER DUAL SPORT
RV90J 1972 88 RV90 ROVER DUAL SPORT
RV90K 1973 88 RV90 ROVER DUAL SPORT
RV90L 1974 88 RV90 ROVER DUAL SPORT
RV90M 1975 88 RV90 ROVER DUAL SPORT
TC100B 1977 97 TC100 BLAZER DUAL SPORT
TC100K 1973 97 TC100 BLAZER DUAL SPORT
TC100L 1974 97 TC100 BLAZER DUAL SPORT
TC100M 1975 97 TC100 BLAZER DUAL SPORT
TC120 1967 120 TC120 TRAIL CAT DUAL SPORT
TC120R 1971 120 TC120 TRAIL CAT DUAL SPORT
TC90 1970 89 TC90 BLAZER DUAL SPORT
TM75A 1976 72 TM75 MINI CROSS OFF ROAD
TM75L 1974 72 TM75 MINI CROSS OFF ROAD
TM75M 1975 72 TM75 MINI CROSS OFF ROAD
TS100A 1976 97 TS100 HONCO DUAL SPORT
TS100B 1977 97 TS100 HONCO DUAL SPORT
TS100K 1973 97 TS100 HONCO DUAL SPORT
TS100L 1974 97 TS100 HONCO DUAL SPORT
TS100M 1975 97 TS100 HONCO DUAL SPORT
TS50J 1972 49 TS50 GAUCHO DUAL SPORT
TS50K 1973 49 TS50 GAUCHO DUAL SPORT
TS50L 1974 49 TS50 GAUCHO DUAL SPORT
TS50R 1971 49 TS50 GAUCHO DUAL SPORT
TS75A 1976 75 TS75 COLT DUAL SPORT
TS75B 1977 75 TS75 COLT DUAL SPORT
TS75M 1975 75 TS75 COLT DUAL SPORT
TS90 1970 89 TS90 HONCHO DUAL SPORT
TS90J 1972 89 TS90 HONCHO DUAL SPORT
TS90R 1971 89 TS90 HONCHO DUAL SPORT
T125-2 1970 124 T125 STINGER STREET
T125 1967 124 T125 STINGER STREET
T125R 1971 124 T125 STINGER STREET

jackyman · Posted: Mon Oct 18, 2010 2:09 pm Post subject:

Well it seems I have that part. Seems that the only way to get around the problem is to either sources some T500 clamps or modify what I have. I have traweled the web for alternative bush suppliers without joy. The joys of restoration!!

jackyman · Posted: Mon Oct 18, 2010 2:14 pm Post subject:

Re-phrase , source some replacement GT500 clamps for the T500's ones which i have plenty of.

Bikegeezer · Posted: Tue Oct 19, 2010 6:54 am Post subject:

jackyman · Posted: Tue Oct 19, 2010 9:34 am Post subject:

The bike and spare frame that i have are both GT500's (according to frame numbers) , but both have the larger bores bushes fitted to the Steering Stem Head so the handle bar clamps have a diameter of 12mm (.472"). This leads me to believe that they are off a T500. Am I just unlucky to have aquired the only 2 GT500's with incorrect handle bar clamps (LOL) or was there some kind of transition period within the factory where certain parts were used up ? To all intents and purposes there is very little dimensionally between the bushes except the internal diameter. Are there any other models that use the larger bored bush?

Bikegeezer · Posted: Thu Oct 21, 2010 6:59 am Post subject:

dorT500 · Posted: Thu Oct 21, 2010 4:52 pm Post subject:

jackyman · Posted: Fri Oct 22, 2010 4:22 pm Post subject:

Here are one of my sets,

dorT500 · Posted: Fri Oct 22, 2010 5:10 pm Post subject:

Bikegeezer · Posted: Fri Oct 22, 2010 8:14 pm Post subject:

jackyman · Posted: Sat Oct 23, 2010 7:07 am Post subject:

Sorry about that , had to resize the files.