Hi guys, I've decided to drop the spare 340 Liquifire Motor I have into my 78 for this season as cash is kinda tight and all I'll need for this motor is different carb jets.
That leads me to this question: What are ways of know whether this is a 76 or 77-78 motor as they have different jetting requirements? It has square CDI plugs, though I know that doesn't mean much (could have been changed for some reason)
Also, I'll be using my stock 440 Final drive gears... I know performance will suffer, but are there any simple (and cheap) clutch tweaks that could help? My sis will be probably be riding it primarily and she doesn't really like to break 25mph anyway!
Thanks!
I can post the (engine) serial number if any of you have a table that shows what's what....
the parts book only shows two 340 liquid motors with a chassis serial number break of - 70000 & 70001-
But it shows three 440 motors with a chassis serial number break of - 70000 & 70001-
80000 & 80001-
The 76-79 fine tune manual says @ sea level @ 0 to +40 Deg.
1976 liquifire
340cc ----------- 440cc
main jet 180 --- 180
jet needle 6DH3*4 --- 6DH3*3
needle jet O-8 --- P-0
Throttle valve 2.0 --- 2.5
Pilot jet 45 --- 40
air screw 2 open--- 1.5 open
1977 & 78 Liquifires
340cc ----------- 440cc
main jet 210 --- 220
jet needle 6DH3*4 --- 6DH4*4
needle jet O-6 --- P-0
Throttle valve 2.0 --- 2.0
Pilot jet 40 --- 30
air screw 1 open --- 1.5 open
Sorry I can't tell you what the difference is other than that.
Kenny
AKA: Kenny, Grumpy, Mr. Richard Head
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If someone with a 76 340 liquifire could look at the head on their engine and report back the casting numbers on it, the 77/78 340 head was changed and the casting number would be different. You would be able to figure out yours by matching the numbers.
'76 440 cyclone
'76 440 liquifire '78 440 Cyclone
'75 JDX8 (sold to a member here) '78 Liquifire(CrossCountry Clone) '80 Liquifire(sold)
Generally the 76's were the only "square CDI plug" motors built, as the 77-78's were the round plug. But, as you said, it could have been changed.
Also, some of the jetting changes Kenny talks about were because of air box changes. The 77-78 was less restrictive than the 76's. They took out the "cheese grater" plate and changed the inlet baffel too.
I "think" they may have also revised the porting too, but can't swear to it. The 340 was 45 hp in 76, but 47 hp by 78. Not totally sure about 77, but "I think" they were 47 hp also.
I hope this helps!
-Rainville
B)
Honorary Tech Editor
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