# NHTSA Preliminary Evaluation PE89149
> **THROTTLE GRIP STICKS** · Opened 1989-08-03 · Closed 1989-09-28
## Investigation
- **Action number:** PE89149
- **Type:** Preliminary Evaluation
- **Open date:** 1989-08-03
- **Close date:** 1989-09-28
- **Manufacturer:** Yamaha Motor Corporation, USA
- **Affected makes:** YAMAHA
- **Affected components:** VEHICLE SPEED CONTROL:LINKAGES
- **Affected model years:** 1989
- **Affected (make, year) variants:** 2
## Summary

SUMMARY:ONE ACCIDENT REPORTED BY AN EXPERIENCED RIDER ALLEGES THATTHE THROTTLE STUCK OPEN.ALLEGES THAT PROBLEM CAN BE DUPLICATED BYLOOSENING THE RIGHT HANDLEBAR SWITCH SCREWS.COMPLAINT ALLEGES NEITHERMODEL CYCLE HAS INDEXING PIN/HOLE FOR THROTTLE HOUSING.===

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=PE89149)
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