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Old 01-25-2011, 06:19 PM   #1
Alpinestars102
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sluggish idleing and backfiring

So I finally got the bike running again. Changed the head, and got the bike timed. When i start it, it runs but after about 30 seconds it starts running sluggish and it backfires through the tailpipe. Also I think there is an exhaust leak where the exhaust connects to the heads. It seems to run hot also. After a few minutes of running the bike dies. Any suggestions?
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Old 01-25-2011, 06:27 PM   #2
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timing or bad valve maybe
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Old 01-25-2011, 06:38 PM   #3
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prob bad valve. dammit lol. this is getting annoying. i may just get a used motor when i have the money
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Old 01-25-2011, 06:56 PM   #4
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Check for vacuum leaks.
Did you fully refill the cooling system and "burp" it?
Are the spark plugs tight?
Did you run a copression test?
If so, what was it?
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Old 01-25-2011, 07:42 PM   #5
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Timed? As in cam timing? Are you sure the timing is correct? make sure you have the spark plugs wires/coil sticks going to the correct cylinders.

Last edited by signpimp; 01-25-2011 at 07:42 PM. Reason: edited words
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Old 01-25-2011, 10:33 PM   #6
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alright guys i will check all of that tomorrow. appreciate the feedback
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Old 01-25-2011, 10:35 PM   #7
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How long has it been down? How old is the fuel?
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Old 01-25-2011, 10:58 PM   #8
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Sounds like the cams are off a tooth or two...
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Old 01-25-2011, 11:53 PM   #9
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its been sittin a while, i did siphon the gas out and put new gas in about a month and a half ago though. ill check the timing again tomorrow.
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Old 01-25-2011, 11:56 PM   #10
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Old 01-26-2011, 12:06 AM   #11
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it's usually done after cleaning out the cooling system and adding new coolant. you take the radiator cap off and run the bike until it "burps" which will be an air bubble.
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Old 01-26-2011, 05:04 AM   #12
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Yep^. Bascally you're running it till the thermostat opens and allows any trapped air to vent.
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Old 01-26-2011, 08:54 AM   #13
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Old 01-26-2011, 09:48 AM   #14
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does it back fire more on the d-cel? sounds like it's running lean
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Old 01-26-2011, 10:29 AM   #15
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well i cant really tell, it backfires pretty loud just being in idle. i havent taken it out for a test drive yet
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Old 01-26-2011, 01:08 PM   #16
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I would do what patrick said. Check for vaccum leaks. Is it throwing any codes? Could be TPS sensor as well.
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Old 01-27-2011, 09:47 PM   #17
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well its throwing a code (9 blinks) but in the manual it says engine will run normally even with it unplugged. so im gonna pull the valve cover off and check for timing. and ill try and check the vacuum diagram also to make sure thats all good
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Old 01-28-2011, 12:28 AM   #18
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Quote:
Originally Posted by Alpinestars102 View Post
it's usually done after cleaning out the cooling system and adding new coolant. you take the radiator cap off and run the bike until it "burps" which will be an air bubble.
Quote:
Originally Posted by Patrick View Post
Yep^. Bascally you're running it till the thermostat opens and allows any trapped air to vent.
I didnt do none of this and i know i should had but i havent had any problems after i changed all my coolant.

now about your bike..... is out of time it looks like.

(my buddy had his bike off timing and it was off by 3t on exhaust and 2 on intake. that thing sounds like a ducaty at idle. LOL...

after fixing it... then it had bent valves due to the timing been off....

this are some of the things that I would not mess with! let the people that knows what they are doing work on it.... i can take my motor out and swap it i'm sure.... but when it comes to specs and opening internal parts like valve adjustment then i let someone that knows what they are doing take care of it.

hope you get your bike back on the road and ride it.... but i think the bike is out of timing.

Last edited by floyd600; 01-28-2011 at 12:31 AM.
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Old 01-28-2011, 01:22 AM   #19
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alright well i just got a good job. so when i get my first paycheck, some of it will be going to motorcycles unlimited to get it fixed and in running condition. hopefully its not tooo much money. but then again, if i want my bike running then thats what i'll have to do. and plus i want to check them out, so its a win win
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Old 01-28-2011, 01:24 AM   #20
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Quote:
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alright well i just got a good job. so when i get my first paycheck, some of it will be going to motorcycles unlimited to get it fixed and in running condition. hopefully its not tooo much money. but then again, if i want my bike running then thats what i'll have to do. and plus i want to check them out, so its a win win
pm send!
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