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Old 09-03-2014, 07:10 PM
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Default Tilting a Honda GX390 down

Hi All,
Looking for feedback here,
I'm doing some mods to my Buggy (adding rear suspension) and am looking at mounting the engine (GX390 clone) at an angle of 5' down so the cylinder assy will be a bit lower than normal, will this affect the running ? was thinking of putting the dip stick in the forward hole and adding a little more oil so the slinger doesn't miss out.

Anyone done this ? I know some racing karts tilt the smaller Honda clones forward so the cylinder is higher

Let me know JK
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Old 09-03-2014, 07:40 PM
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Quote:
Originally Posted by Jim-L-L View Post
was thinking of putting the dip stick in the forward hole and adding a little more oil so the slinger doesn't miss out.
Don't! If you add more oil, in that config, it will run up the bore; the slinger should still catch it & do it's job...

I would disconnect the oil sensor though... if you haven't already...
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Old 09-03-2014, 08:55 PM
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So yes to tilting & No to extra oil,
Have also been thinking about making 5' ramped mount to keep engine level
Will be disconnecting oil sensor, it always cuts on the bumps
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Old 09-03-2014, 09:07 PM
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ok, now you've done it... why is the engine tilted in the first place? Looking at the pics, it appears to be on a swing arm; correct?
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Old 09-03-2014, 09:23 PM
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Yeah, it's on a swing arm. I decided to lower the C of G by lowering the ride height and lowering the engine position as well as adding some shocks to save my A$$ : )
Will post some before & after pics soon
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Old 09-04-2014, 07:17 PM
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In that case, I wouldn't change a thing, leave it exactly how it is; as soon as you sit in it, the angle will change, as it will every time you hit a bump...
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Old 09-05-2014, 05:19 AM
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On are race karts we use a 15 deg engine mount. Therefore only 14 oz's of oil ( Cool Power green oil) and we have yet to grenade one from oil starvation. So 5 deg's should not make much of a difference. I am like everyone else, I leave it as is.
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Old 09-07-2014, 05:15 AM
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Decided to move the bearing mounts to the underside of the swing axle and make a new hole 30mm higher for the pivot pin, now everything sits nice and level when static, I was trying to get everything mounted as low as possible here but simplicity & practicality wins out, it's still better than the original position, thanks for the feedback
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Old 09-07-2014, 10:18 AM
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I hope you don't bottom out in the rear and bend your axle on both sides.....
It don't look like you have much room to swing and those shocks provide more than what you need. I'd make a stopper so I know the frame will NEVER hit the axle.....
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Old 09-07-2014, 06:51 PM
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Move the top shock mounts down an inch or so...
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Old 09-07-2014, 07:28 PM
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I agree bout both the possible bottoming out and moving the mounts down(place the frame to the LOWEST position youll 'want' to allow it to travel, pivot point down... compress the shocks ALL the way down while staying afixed to the bottom mount, mark the top and 'that' is where you will 'want' the top shock mount). 'Lowering' the frame to desired height from that point, 'can' be done by cutting acouple links off the springs.

Asfar as the tilt... IMO, the fraction of time the tilt would be 'dangerous' is so brief that it wont be of any 'issue'. Now... if it's an extreme tilt at 'idle'... then I 'can' foresee problems.
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Old 09-08-2014, 05:09 AM
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Thanks guys
yeah had thought about fitting some rubber bumpers to protect the axles,had been looking into that. Cutting the springs is a good idea as well, but have also thought about unscrewing the shock rod end and putting a 20mm long spacer on the damper shaft to limit the travel to less than the distance between frame and axle.
Will be making upper shock mounts with multiple holes to allow some adjustment of height or if I want to get some shorter & softer shocks as these are really hard ! (random pick from bike wrecker) Engine will be level when sitting normally and tilts forward as swing arm moves up maybe 5' maximum
Cheers JK
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