The Great Restriction Thread - a discussion of !
Posted: Mon Dec 21, 2009 10:45 am
When I have been reading through the forum I have been getting a bit lost on what's what about the restrictions of the bike
Easily done as I am a bit
However, while reading Japanese articles the confusion thickened more
So today I delved my nose into the service books for the models and a veil has been lifted. Most of it I now understand as being the majority of you use an L model.
What I have just now is the H information but will add L in a day or so's time.
Carburators:
ZX4 = 30mm CVK
ZXR400H1 = 32mm CVK-D32
ZXR400H2 = 32mm CVK-D32
ZXR400J1 = 32mm CVK-D32
ZXR400J2 = 32mm FVK-D32 (These should be on your want list)
ZXR400L1 = 30mm CVK (1990)
CDI:
H1 & H2 rev limiter 15,000 RPM
Speed restrictor:
All Japanese bikes 180KPH
Compression ratio:
H1 = 12
H2 = 12:1
J1 = 12:1
J2 = 12:1
Horsepower (PS) Crank:
H1 = 59 @ 12,000 RPM
H2 = 62 @ 12,500 RPM (E , I , Ar)
H2 = 60 @ 12,500 RPM (F)
J1 = 59 @ 12,000 RPM
J2 = 59 @ 12,000 RPM
I'll stop there as it's easier to scan the sheets in and post up.
Now here's a thing, the H was never an official import yet the Kwak book doesn't specify it as (J) for Japan as it does with the L models and indeed you can see above that there was specific models for Italy and France.
They all use 32mm carb's and wasn't until the 1990 L1 that they dropped them back to 30mm, I think the L5 still had them but not the L5A (I'll confirm later)
H CDI's have no lower rev limiter in them - explains why my bike goes until 15K and why I have read on Japanese sites that the H isn't restricted (Just speed). So if your L is rev limited below 15K then an H CDI will open it up - it does not need to be a UK spec box !
From what I can gather power output varies between jetting, base gasket thickness and transmission ratio's.
Strangely enough the J2 seems to have been de-tuned yet it was the "Sports Production" - they had the outer cylinders running 102 mains with the inners at 98.
main jet:
H1 = 102
H2 = 98
J1 = 102
J2 = 102/98
My SP carb's from an M also had this 102/98 combination.
Anyhoo, oodles of stuff on the sheets to look through so I'll get them scanned in.
MM!
Easily done as I am a bit
However, while reading Japanese articles the confusion thickened more
So today I delved my nose into the service books for the models and a veil has been lifted. Most of it I now understand as being the majority of you use an L model.
What I have just now is the H information but will add L in a day or so's time.
Carburators:
ZX4 = 30mm CVK
ZXR400H1 = 32mm CVK-D32
ZXR400H2 = 32mm CVK-D32
ZXR400J1 = 32mm CVK-D32
ZXR400J2 = 32mm FVK-D32 (These should be on your want list)
ZXR400L1 = 30mm CVK (1990)
CDI:
H1 & H2 rev limiter 15,000 RPM
Speed restrictor:
All Japanese bikes 180KPH
Compression ratio:
H1 = 12
H2 = 12:1
J1 = 12:1
J2 = 12:1
Horsepower (PS) Crank:
H1 = 59 @ 12,000 RPM
H2 = 62 @ 12,500 RPM (E , I , Ar)
H2 = 60 @ 12,500 RPM (F)
J1 = 59 @ 12,000 RPM
J2 = 59 @ 12,000 RPM
I'll stop there as it's easier to scan the sheets in and post up.
Now here's a thing, the H was never an official import yet the Kwak book doesn't specify it as (J) for Japan as it does with the L models and indeed you can see above that there was specific models for Italy and France.
They all use 32mm carb's and wasn't until the 1990 L1 that they dropped them back to 30mm, I think the L5 still had them but not the L5A (I'll confirm later)
H CDI's have no lower rev limiter in them - explains why my bike goes until 15K and why I have read on Japanese sites that the H isn't restricted (Just speed). So if your L is rev limited below 15K then an H CDI will open it up - it does not need to be a UK spec box !
From what I can gather power output varies between jetting, base gasket thickness and transmission ratio's.
Strangely enough the J2 seems to have been de-tuned yet it was the "Sports Production" - they had the outer cylinders running 102 mains with the inners at 98.
main jet:
H1 = 102
H2 = 98
J1 = 102
J2 = 102/98
My SP carb's from an M also had this 102/98 combination.
Anyhoo, oodles of stuff on the sheets to look through so I'll get them scanned in.
MM!