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Author Topic: Best year LT 250 for hybrid?  (Read 1763 times)

Offline Rainman56

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Best year LT 250 for hybrid?
« on: November 28, 2012, 01:49:05 pm »
Thinking of doing a 250/Zilla engine hybrid.Are any years between 87-92 a better choice than others?How much custom fabricating is involved?I,m assuming frame,engine mounts,pipe,shim axle sprocket out?Just trying to get an idea of what I,m in for ahead of time.Any input is appreciated:).
Can,t fix stupid.:)

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Offline Heminutt

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Re: Best year LT 250 for hybrid?
« Reply #1 on: November 28, 2012, 01:57:00 pm »
i am doing a hybird also. i was told a 87-90 are the easiest. i am doing a 89
89 zilla Bartlett racing Dune Porting,42.5mm rx'd carb,DrQ pipe, vf3 reeds
 89 lt250r custom frame with Bartlett racin Dune Porting, DR Q pipe, zilla carb, vf3 reeds
 00 426ex 12:5 comp, stage2 cam, full yosh exauast, +2+1 a arms, +2 lons

Offline Rainman56

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Re: Best year LT 250 for hybrid?
« Reply #2 on: November 28, 2012, 05:02:43 pm »
i am doing a hybird also. i was told a 87-90 are the easiest. i am doing a 89

Thanks for the info Heminutt.Maybe for airbox/filter due to different shock location?Like i said just hoping to get some info also so I know what I,m getting myself into:)
Can,t fix stupid.:)

Offline Roach

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Re: Best year LT 250 for hybrid?
« Reply #3 on: November 28, 2012, 05:55:59 pm »
i dont think sprocket needs a shim?
92 lt250r                                  86 lt250r
bartlett racing motor                 ftz motor
Q pipe                                flying machine fac. pipe

Offline Roach

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Re: Best year LT 250 for hybrid?
« Reply #4 on: November 28, 2012, 05:57:02 pm »
dont forget the 500 petcock
92 lt250r                                  86 lt250r
bartlett racing motor                 ftz motor
Q pipe                                flying machine fac. pipe

Offline Quadster

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Re: Best year LT 250 for hybrid?
« Reply #5 on: November 28, 2012, 07:11:32 pm »
i dont think sprocket needs a shim?

I got three(whatever the thickness of sprockets are) welded together :'(. Depends how bad the frame and swinger are tweaked!! D?

Offline Rider414

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Re: Best year LT 250 for hybrid?
« Reply #6 on: November 29, 2012, 06:29:04 am »
Can someone elaborate more on this? The output sprocket on the 500 motor does not line up with the drive sprocket on the axle?
Ain't ever seen it......but I have heard it.

Offline Quadster

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Re: Best year LT 250 for hybrid?
« Reply #7 on: November 29, 2012, 01:32:28 pm »
The 500 motor is a bit bigger/wider so the output shaft sticks out a little more than a 250. Normaly about a 1/4 +-inch spacer behind the rear sprocket . Motion Pro sells a chain alignment tool, but i just used a framing square and a straight edge.

Offline Rainman56

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Re: Best year LT 250 for hybrid?
« Reply #8 on: November 30, 2012, 12:25:47 pm »
Whats involved in altering the frame?Cut and weld the tubes?Lengthening portions of the frame and fabricating the mounts?
Can,t fix stupid.:)

Offline Rider414

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Re: Best year LT 250 for hybrid?
« Reply #9 on: November 30, 2012, 05:53:11 pm »
There was a awesome thread on the old site that had all pictures where you had to fab/cut/weld. I have my eyes peeled for a LT250 roller!!
Ain't ever seen it......but I have heard it.

Offline GrkGuy

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Re: Best year LT 250 for hybrid?
« Reply #10 on: December 01, 2012, 09:55:49 pm »
ask lt500kid, we just told him how to fix his.
life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sidays totally worn out shouting "HOLY SH*T...WHAT A RIDE!"

Offline Rainman56

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Re: Best year LT 250 for hybrid?
« Reply #11 on: December 08, 2012, 07:04:23 pm »
Anymore input on this subject?Just curious what frame mods need to be made?
Can,t fix stupid.:)

Offline GrkGuy

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Re: Best year LT 250 for hybrid?
« Reply #12 on: December 08, 2012, 07:24:10 pm »
right side bottom motor mount need to be cut out and rewelded back in in a higher location on the frame rail
life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sidays totally worn out shouting "HOLY SH*T...WHAT A RIDE!"

Offline Rainman56

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Re: Best year LT 250 for hybrid?
« Reply #13 on: December 08, 2012, 07:30:01 pm »
right side bottom motor mount need to be cut out and rewelded back in in a higher location on the frame rail

Thanks,appreciate the info:)
Can,t fix stupid.:)

Offline Iceracer

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Re: Best year LT 250 for hybrid?
« Reply #14 on: December 09, 2012, 10:32:23 am »
Its actually a wider position not higher. I think John had a typo.

Offline BadMoonRacing500

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Re: Best year LT 250 for hybrid?
« Reply #15 on: December 09, 2012, 12:39:21 pm »
Easiest way Ive seen is to put the zilla motor in with the swinger bolt, then you'll see where the frame rail needs to be notched for the lower mount. with that done it will drop in place, put the thru bolt in and then the SBLT front motor mounts. Then you'll see where the cut out for spark plug access and for the kicker to rotate need to be also the flat bracket w/2 holes on the front down tube needs to be notched for the pipe. I would also recommend some gussets.
If brains were gasoline, you couldn't power a **** ant's go-cart 2 laps around a cheerio.

Offline Quadster

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Re: Best year LT 250 for hybrid?
« Reply #16 on: December 09, 2012, 01:23:00 pm »
Heres a couple pics i found...




Offline Heminutt

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Re: Best year LT 250 for hybrid?
« Reply #17 on: December 09, 2012, 01:49:31 pm »
i just picked up a 88 roller. going to be starting my hybrd project soon.
89 zilla Bartlett racing Dune Porting,42.5mm rx'd carb,DrQ pipe, vf3 reeds
 89 lt250r custom frame with Bartlett racin Dune Porting, DR Q pipe, zilla carb, vf3 reeds
 00 426ex 12:5 comp, stage2 cam, full yosh exauast, +2+1 a arms, +2 lons

Offline Quadster

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Re: Best year LT 250 for hybrid?
« Reply #18 on: December 09, 2012, 02:04:59 pm »
Also, make sure to notch enough to easily remove and install spark plug with bike together. I had to use a br8ecm (same as the other b8 or br8 plugs but shorter) and a plug wire off a lawnmower!

Offline Rider414

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Re: Best year LT 250 for hybrid?
« Reply #19 on: December 09, 2012, 06:11:21 pm »
I'm still looking for a roller! Can't wait to do a hybrid.
Ain't ever seen it......but I have heard it.

Offline WestTexasKing

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Re: Best year LT 250 for hybrid?
« Reply #20 on: December 09, 2012, 09:49:30 pm »
87-90 is easiest and requires the least amount of fab (it doesn't matter which year you get, they're all the same with the exception of 24 and 26 spline axles).
85-86 is lightest and requires additional work to strengthen weak areas, some components do not interchange with later year models.
91-92 is heaviest and takes the most work, but winds up being the strongest (provided you strengthen the same areas as all other frames)...you also get the no-link rear shock.

As far as modifying the frame, you need a minimum of these modifications:
Spark plug cutout
RH lowest rear engine attach point needs to be 1" farther out
Wishbone needs to be modified or new downtubes need to be made for the front engine mount
RH frame usually needs some clearance for the kickstarter, my hybrid doesn't but it's also the exception rather than the rule.

That's the absolute minimum, but most people gusset the tubing clusters and use additional tubing to strengthen other areas that need attention.
You'll be putting more stress on the frame because...
Engine is heavier
Engine torques the mild steel frame more
You'll likely be going faster which puts more stress on the frame too

Offline GrkGuy

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Re: Best year LT 250 for hybrid?
« Reply #21 on: December 18, 2012, 07:32:52 am »
just make sure you do the frame rail on the clutch side, if not you will have to pull motor to take off clutch cover
life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sidays totally worn out shouting "HOLY SH*T...WHAT A RIDE!"

Offline ATVMXR

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Re: Best year LT 250 for hybrid?
« Reply #22 on: December 19, 2012, 12:00:23 pm »
Can someone elaborate more on this? The output sprocket on the 500 motor does not line up with the drive sprocket on the axle?



i believe using a 85-86 sprocket hub fixes this....
92/87 Hybrid
88 Zilla
bunch of other race quads

Offline Rainman56

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Re: Best year LT 250 for hybrid?
« Reply #23 on: December 19, 2012, 05:32:13 pm »
Do the hybrid frames hold up using them for MX???Not alot of metal in there on the tube mods,especially the upper tube for spark plug clearance.
Can,t fix stupid.:)

Offline Iceracer

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Re: Best year LT 250 for hybrid?
« Reply #24 on: December 20, 2012, 06:05:40 am »
Using the 85 hub and running the sprocket outboard works to fix chain alignment, as does useing a the center from a an old sprocket between the hub and sprocket. I use the inside race from a bearing between the bearing and hub on mine many differnt ways to do it.

As far as holding up in mx, better bring a welder with you. The newest of these frames are 20 years old now, as a 250 there not terrible, but expect to chase cracks. The best thing you can do to alleviate this BEFORE YOU mess with an engine swap, is invest in QUALITY shocks and suspension components OEM doesnt cut it. You will be faster with good suspension than you can ever be with a Crap suspension and a big fast engine.

Anyone I have ever talked to has said the same thing about Hybrids and MX, fun in practice but too much to hold onto to race, unless you run big wide open gp style stuff.

 

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