Re: Suzuki DT85 Rpm Trouble
Hi guys,
I am new at this, so bear with me if I don<t click the right button
I also have/had the same problem as Paul last year with my Suzuki DT 85, year 1984, where it would slow down by itself at high speed. I would turn the key off, wait 10 second and restart and it would go fine for 15 or 30 minutes and slow down again.
It finally stayed at the 5 mile/hour speed when going full trottle all the time.
Since then, I've been going nuts trying to figure out the problem !
I changed the diafram of the fuel pump since it was accelerating when my buddy was feeding gaz directly in the troat of the carburators. However, it did not improve with a new diafram.
I then changed the primer bulb and both hoses attached to it, no change.
I tried a seperate gaz tank (original built in under floor), no change.
I did a compression test and the first carb had 115lbs, while the other 2 had 135lbs.
I dismantled and cleaned the 3 carbs, soaking in gaz for one week. I checked the needle valvs (OK), inspected the gaskets (OK), I air dried all passage ways in carbs and re-installed them.
I did not check the float clearance though. The idle in neutral is still rough and uneven.
I then discovered that gaz was pissing from the fuel line connection at the motor, I then connected the fuel line directly to the gaz filter inside the motor.
The motor seemed to be running smooth afterwards, but after 5 minutes of idling and reving in forward, my friend discovered that I had forgotten to replug the arm which connects to the oil injection mechanism, because I had checked the gaz hose under that arm !! After I replugged the oil injection arm, the motor would idle rough again. I tried to lower the oil consumption a bit, no change.
This was all tested outside the water with a water hose connection.
I also tried to check the ignition timing which was inconclusive because I could not adjust to the 23 degree mark on the advance timing, and the reading is way off and cannot adjust further in neutral. My shop manual says to test the advance timing in neutral at 1000rpm, same as the retard ??? Can that be ? Or should it be tested at full trottle in forward gear ?
After reading the above posts, I realize one of my problems might be the impeller, as the motor was very hot after 5 minutes of operation.
I am buying a new impeller today and will inspect and replace if needed.
Could you confirm the advance timing procedure and advise if you think other gaz problems might be occuring, or is my motor shot aand should be scrapped !
Thanks for reading my novel ! Your suggestions, advice are more than welcome.
merci,
Jack
