yamyrider
Newbie
- Joined
- Sep 25, 2006
- Messages
- 17
Hey guys, I am working on a 2007 Vector GT that wont idle until hot and have some questions.
Here is some background, sleds was "fixed" by apparently a Yamaha mr fix it. He replaced fuel pump and cleaned carbs which did absolutely no difference. Still rough idle and stales till very warm. We changed plugs, recleaned carbs, cleaned air filter, adjusted throttle free play and still no change.
Here's is what we did not do: open the top of the carbs to clean (ive never done these carbs upper part) did not check tensioner or possible electrical issues.
Sled runs great when warmed up and past 1/4 throttle. Can ride all day.
What does part #7 do and is part #5 pilot screw set an adjustment for idle mixture.
If we try to turn up idle a little we get an idle hang and if we turn it down ever so slight it stales out.
Any thoughts or suggestions?
Thanks.
Here is some background, sleds was "fixed" by apparently a Yamaha mr fix it. He replaced fuel pump and cleaned carbs which did absolutely no difference. Still rough idle and stales till very warm. We changed plugs, recleaned carbs, cleaned air filter, adjusted throttle free play and still no change.
Here's is what we did not do: open the top of the carbs to clean (ive never done these carbs upper part) did not check tensioner or possible electrical issues.
Sled runs great when warmed up and past 1/4 throttle. Can ride all day.
What does part #7 do and is part #5 pilot screw set an adjustment for idle mixture.
If we try to turn up idle a little we get an idle hang and if we turn it down ever so slight it stales out.
Any thoughts or suggestions?
Thanks.
SumpBuster
TY 4 Stroke God
- Joined
- Jul 18, 2003
- Messages
- 2,353
- Location
- Carlisle, NY .
- Country
- USA
- Snowmobile
- 18 sidewinder; 06 Apex RTX
Were the carbs balanced?
yamyrider
Newbie
- Joined
- Sep 25, 2006
- Messages
- 17
They were not synced
74Nitro
VIP Member
- Joined
- Feb 18, 2013
- Messages
- 5,263
- Age
- 52
- Location
- Dublin Ontario
- Country
- Canada
- Snowmobile
- 2019 Sidewinder LTX
The first thing I would do is a carb sync as Sumpbuster suggested.
If that doesn't fix it, then do a leakdown test on each cylinder.
I had a sled like this behaving just like yours and it was exhaust valves gone bad on one cylinder.
If that doesn't fix it, then do a leakdown test on each cylinder.
I had a sled like this behaving just like yours and it was exhaust valves gone bad on one cylinder.
SumpBuster
TY 4 Stroke God
- Joined
- Jul 18, 2003
- Messages
- 2,353
- Location
- Carlisle, NY .
- Country
- USA
- Snowmobile
- 18 sidewinder; 06 Apex RTX
A friend who bought one of my rx1s years ago went to adjust the idle up a hair, turned the wrong screws and it never idled right after that until they were synced (easier to spell balanced). I had my Vector done by Excel before selling it, as I dont have the vacuum setup tool. Bike shops do. Ran like new after 8000 miles. But cold blooded for sure.
