Er6 in a ZXR400 frame

[RDjase]

Next project has to be a CBR900 in the 400 frame , its been done in the U.K. and sounds like a good project to me, the 600 goes well enough so the 900 will be much more fun filled.

A mate has put a 900 blade engine in a 3TJ FZR frame, should be rather exciting when its finished. Not much to do but a bathroom and keeping her indoors happy is the priority at the mo

[Grumph]

A mate has put a 900 blade engine in a 3TJ FZR frame, should be rather exciting when its finished. Not much to do but a bathroom and keeping her indoors happy is the priority at the mo

Boring....an FZR1000 motor fits an FZR400 chassis......

[ducatilover]

Boring....an FZR1000 motor fits an FZR400 chassis......

Okay...I must research that a bit

[Grumph]

It was a readers special in PB mag some years back.

Rear mounts line up apparently. Upper front mounts need fabricating.
Standard CV carbs require some trimming to fit in the frame and airbox of course is a non starter.

He even used a 5.5 rear...and the whole thing was very rideable.

[scracha]

Next project has to be a CBR900 in the 400 frame , its been done in the U.K. and sounds like a good project to me, the 600 goes well enough so the 900 will be much more fun filled.

The first CBR600, whilst a lovely road bike was a piece of shite in terms of its chassis compared to the same aged 400 so it made a lot of sense to graft the motor. The CBR900 was a well sorted and light piece of kit straight out the crate.....what would be the point sticking it in a 400 frame?

Can we turbo or supercharge something and stick it on track.....would be far more fun.

[roadracingoldfart]

The first CBR600, whilst a lovely road bike was a piece of shite in terms of its chassis compared to the same aged 400 so it made a lot of sense to graft the motor. The CBR900 was a well sorted and light piece of kit straight out the crate.....what would be the point sticking it in a 400 frame?

Can we turbo or supercharge something and stick it on track.....would be far more fun.

Your almost rite Steevie , the 600 was a wobbler but the 400s didnt come to this end of the globe till many years later anyhow so we only knew of them from mags and such. The 600 was a lovely roadbike but also a bloody deal better to race than the CBX550 before it.

The 900 wasnt as nice as some think especially to race , it was a shocking steerer and it behaved badly over bumps for some reason. The 400 has almost the same size forks as it did.

The reason i want to do a 900 / 400 or whatever is twofold, like the bike i built you its a project for me, and to some extent a " shove that in ya face " move to the soothsayers that say i know not what i do and i am a nothing in the bike world. Its like calling card much like my original CB400/4 which in race trim was showing almost 50 Hp and could hold its own with much newer and bigger bikes.
The other aspect is it would be fucking great fun to try and tame the piece of heathanistic beast dont you agree . I may even un-retire to have a blast on it.
Bring on the little guy with attitude and then put a shit load of power into it lol.

[Tony.OK]

Your almost rite Steevie , the 600 was a wobbler but the 400s didnt come to this end of the globe till many years later anyhow so we only knew of them from mags and such. The 600 was a lovely roadbike but also a bloody deal better to race than the CBX550 before it.

The 900 wasnt as nice as some think especially to race , it was a shocking steerer and it behaved badly over bumps for some reason. The 400 has almost the same size forks as it did.

The reason i want to do a 900 / 400 or whatever is twofold, like the bike i built you its a project for me, and to some extent a " shove that in ya face " move to the soothsayers that say i know not what i do and i am a nothing in the bike world. Its like calling card much like my original CB400/4 which in race trim was showing almost 50 Hp and could hold its own with much newer and bigger bikes.
The other aspect is it would be fucking great fun to try and tame the piece of heathanistic beast dont you agree . I may even un-retire to have a blast on it.
Bring on the little guy with attitude and then put a shit load of power into it lol.

Suddenly got a mental picture of Dr Frankenstein yelling "its aliveeeee!!!!!"
Put me down for a test squirt please MR

[ducatilover]

Put me down for a test squirt please MR

Me too!

Anyone thought of punching a ZXR750 lump in a ZXR400L chassis?

[neil_cb125t]

Me too!

Anyone thought of punching a ZXR750 lump in a ZXR400L chassis?

yep - the head is too wide by 70mm or so to fit in the frame.....

[ducatilover]

yep - the head is too wide by 70mm or so to fit in the frame.....

Bugger!
The ZZR/ZX6 motor can be taken out to 800cc anyway

[RDjase]

A mate has put a 900 blade engine in a 3TJ FZR frame, should be rather exciting when its finished. Not much to do but a bathroom and keeping her indoors happy is the priority at the mo

Boring....an FZR1000 motor fits an FZR400 chassis......

He has milled all the Honda markings off it and its going to be road legal (ish) May have to put a throttle stop for getting WOfs

Its got a late Gixer 600 front end and all sorts of other mods, bike mad pommy engineer

Willl get some pics and post them

[scracha]

The other aspect is it would be fucking great fun to try and tame the piece of heathanistic beast dont you agree . I may even un-retire to have a blast on it.
Bring on the little guy with attitude and then put a shit load of power into it lol.

Would be FAR more interested in a VFR800 engine slapped into a lightweight sportsbike. The bike Honda should have made instead of going the lardy arse tourer way. Fuckin ulisys club have a lot to answer for

[koba]

Would be FAR more interested in a VFR800 engine slapped into a lightweight sportsbike. The bike Honda should have made instead of going the lardy arse tourer way. Fuckin ulisys club have a lot to answer for

Would the engine be a large contributor to the weight of a VFR800?

I notice my minimally framed NC21 is still HEAVY.

[ducatilover]

Would the engine be a large contributor to the weight of a VFR800?

I notice my minimally framed NC21 is still HEAVY.

V4 will usually weigh a fair bit more than an IL4 sadly.

[koba]

V4 will usually weigh a fair bit more than an IL4 sadly.

It's quite interesting thinking about the development of Honda V4's.

If you look at the firs ones they are conventionally framed for a pre-alloy bike, then around the time of mine (1986) they seem to replicate a similar idea in alloy. It looks as if the engine is used as a stressed member because the frame is super spindly.
Nek minnit, big frame.
From the NC30/RC30 age the frame gets all beefy; about the same as other contemporary bikes.
Is this just the direction development of frames went in around that time or is it an indication Honda expected the engine to contribute to the rigidity of the bike but that failed? Is it just to sell bikes on the trendy image of the time?

Rhetorical questions really, just thinking about it.

EDIT: V4s carry their weight well but are heavy as all hell. A triumph in marketing over real-world performance?