Steve M
Junior Member
Offline
SuzukiSavage.com Rocks!
Posts: 60
|
THX for all this real good info guys.
I have an original Suzuki manul for 86 model with 87, 88, update info. Also I have a clymer manual.
Both say my model has 155 main jet as standard and the US model has a 133 main jet! So you folk in the US have a much leaner set up from the manufacturer.
It also says for my model (86 to 88) that the base setting for the idle jet screw, (which does not have a plug in it), is 3 and a 1/4 turns out. The bike was idling nice at that setting and pulled away sweet.
I have checked the size of hole in my main jet and couldn't get a 1.5mm drill through it!!!
So when I bought mine it had a nice Raask exhaust on it, (I have looked at pictures on the net and it is a Raask), which is good. But it seems whoever fitted it didn't put in a bigger jet, VERY BAD!
Something else I just thought of is that back in the days when this engine was designed we had lead added to our petrol, nowadays we have unleaded 95 octane in the UK which does run hotter than the old leaded used to!
So mine is gonna get a 165 main jet, with the same pilot / idle jet left in, as it must have been running far to lean at high throttle openings.
Just a thought for you chaps in the USA, over here the emissions are checked for car annual MOT checks, but motorcycles don't get tested for emmissions! So we can jet richer than standard.
I don't know if the same applies to guys?
If I was in the USA knowing what I have dicovered from this thread I think I would run a bigger main jet and put up with a slightly reduced range, then if they do check emmisions over there put in a smaller jet just for the annual MOT, (or whatever it is you have ), and ride easy to the test station.
I am now convinced that my exhaust valve failed because the engine was running to lean when at high throttle openings, and I will be running richer with my replacement engine.
Thanks to all who have replied to this thread.
I think moral of this one is if you want to avoid the risk of losing an exhaust valve and trashing your engines piston and top end like happened to me, make sure your main jet is big enough. European spec that means at least a 155 main jet.
many thanks to all who have replied on this thread it has helped me suss what happened and I should be able to prevent a recurrence. Might help others who read it as well.
|