newby needs advice, will it work?

[Russtik]

Hi, first post so ill keep it short, this is my first build, so id like some advice on whether this combination will work, please keep in mind i dont want a speed machine and my budget is nearly non existent!

what i have is a Yamaha xj 650
and an isuzu trooper.
i want to use the front axle complete as is, i mean take the engine out of trooper cut the chassis off with all suspension and axle attached.
tidy it up, lock the steering etc. and build a frame in between the chassis and the bike frame.
an easy independent rear suspension? (obviously i may have to look at softer springs and shocks)
any feed back from you guys would be appreciated.
cheers!

[harry]

Hi and welcome. :thumbsu:

Can't see any reason why it wouldn't work BUT that is a bloody great heavy axle. You might need a bigger engine to move it.

[odie]

Ratio, ratio, ratio, get it wrong and you will be going no-where slowlie!

[Blackjack]

Hi, first post so ill keep it short, this is my first build, so id like some advice on whether this combination will work, please keep in mind i dont want a speed machine and my budget is nearly non existent!

what i have is a Yamaha xj 650
and an isuzu trooper.
i want to use the front axle complete as is, i mean take the engine out of trooper cut the chassis off with all suspension and axle attached.
tidy it up, lock the steering etc. and build a frame in between the chassis and the bike frame.
an easy independent rear suspension? (obviously i may have to look at softer springs and shocks)
any feed back from you guys would be appreciated.
cheers!


So why try and build something that you don't know is going to work? If your question is could I build it, then the answer is yeah.

If your question was would I build it, then the answer is no.

But your question is whether the combination will work for you, and the answer would appear to be no, because you're not sure and you're building it.

IRS, is over rated, over complicated, and over budget in your case.

Big ass 4x4 diffs, are likely to be quite low ratio, and most bike stuff needs tallish ratios. Get that wrong and a top speed of 70mph is perfectly possible. But that also means you'll be getting SFA to the gallon, so don't think "Well I could live with that..."

As for using half an Isuzu Trooper chassis and pulling it along with an XJ650...

You need the wheels, and you need the axle, so the first thing to do is to find out what you need for a rear diff ratio to work with some wheels and tyres you can afford.

Once you've worked out the wheels and axle you can afford that meet your budget (looking at a Volvo 740 manual is something I keep meaning to do, they're not that wide you know...) then you know how high off the ground the axle is going to be and you can think about building a frame.

If you use the swing arm pivot mounts, top shock mounts and centre stand mounts on the stock frame as mounting points, make some brakets that bolt to those, make some more that bolt to the axle, then it's not too hard to connect those brackets with a bit of tube.

General idea...

http://www.youtube.com/watch?v=-0_9Hb7Frx4

[devon-tony]

I would sell the isuzu trooper, buy a reliant axle and some tubing

[baldybongo]

Yeah, reckon you ought to try something a bit simpler for a first build.
Dont want to be put off from the start.

[Russtik]

thanks guys.
great advice,
and your right, so back to the drawing board,

bye the way the ratio is
10/43 or 9/41, not sure which!

i may keep the front end, if i get through the first project it would make an awesome tadpole style.

thanks again,

[Russtik]

ok so ratios? would the rear axle be usable? i have 2 of them!

it works out at 4.1 or 4.5 to 1
any good?
what would be the ideal ratio?
and cant i change the final ratio by changing wheel size?

[Borg]

Don't forget the SVA