Question about 2001 Aprilia SL Mille Falco

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When I start the engine & put it in gear to start riding, the rpms increase but there is no torque to the rear wheel. The engine just runs like it is in neutral. It doen't matter which gear I put it in. I release the clutch, and the bike won't move. I have checked the chain and sprockets, they are fine, about 6 months old.

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  • Anonymous Mar 30, 2014

    clutch does not fully engage to neutral. Motor shuts off or bike moves after putting in gear

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The bike is 6 months old, or the chain/sprockets? Either way, sounds like you need a clutch.

Posted on Jun 29, 2009

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1 Answer

My Nissan quest 2004 won't accelerate in drive will in neutral then loses all power


if you have it in neutral then the car will not accelerate
just the engine will increase in rpms
if it is a manual and in gear and you increase engine rpm but the car is not moving, it is more that likely a clutch master cylinder or cable problem
if automatic , run the fault codes and check for a problem torque converter clutch servo/solenoid problem

Nov 29, 2016 | 2004 Nissan Quest

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Turbo boost adjustment for mack 470h.p. engine, how do you make this adjustment?


there is none as the engine uses all the boost it can get
if you want more power then have the pump reset to 500 hp settings
boost pressures are a result of the fuel settings from the pump allowing more fuel in to burn which produces a hotter exhaust making the turbine wheel spin faster which creates the extra boost
a genuine mack 470 hp engine is a really torque engine if driven properly and if dyno tested will produce around 450 hp at the back wheels with a relative flat torque curve which means that the rpms hang on longer before having to change gears
however to keep the maximum torque available at rpms you have to drop a half ratio as soon as the rpms start to drop as the range change will be 250 rpms and that will keep the torque range well up
don't let it bog down as all that does is waste fuel and drive time

Jul 02, 2016 | Cars & Trucks

1 Answer

Why does the rpms on my 96 dodge grand caravan just keep going up when driving


It is common for rpm's to increase, as the acceleration increases... That is when the transmission comes into effect, when the RPMs increase, the next gear is then shifted into.
if the RPMs continue to increase, then the transmission is not shifting. It's possible that you have a transmission or torque converter problem.

Mar 31, 2015 | 1996 Dodge Grand Caravan

1 Answer

Why does my 4 wheel drive not work all the time?


Elaine,

not work, do tell what makes you think it dont work (a lamp) or tires slipping or dead tires. (by tires mean that and traction)??????????

what mode fails, of the many, and where.???????



first off, we dont know what your tires are touching.

on road, or off road. pavement or ICE or snow.

that matters big time . (you read manual and match MODE to Road)

your lost operators guide explains all that, right?

eg: how and when to use, 4wd, its all there. I promise.

ControlTrac 4-wheel-drive system



here are the mode. which one , gives you problems.



quote ford with comments.



What are the modes, and how do they differ?

(note this is the operational behavior of a 2008 Ford Expedition. Newer and older Expeditions will vary only slightly)



2H 2-wheel-drive with high range gearing (1.00:1) Rear-wheel-drive capability,

2-wheel electronic traction control system is enabled



4A 4-wheel-drive Auto with high range gearing (1.00:1) Full-time all-wheel-drive capability, ((best on pavement or any time)

Electronically adjusted torque split to front & rear wheels, Electronically variable center differential,

Front driveshaft & rear primary driveshaft allowed rotational speed difference,

4-wheel electronic traction control system is enabled



4H 4-wheel-drive with high range gearing (1.00:1) Part-time 4-wheel-drive capability, (not for dry pavement EVER)

Continuous 50/50 torque split to front & rear wheels, Electronically locked center differential,

Front driveshaft & rear primary driveshaft mechanically locked with no rotational speed difference,

4-wheel electronic traction control system is enabled



4L 4-wheel-drive with low range gearing (2.64:1) Part-time 4-wheel-drive capability, (off road usage, mostly)

Continuous 50/50 torque split to front & rear wheels, Electronically locked center differential,

Front driveshaft & rear primary driveshaft mechanically locked with no rotational speed difference,

4-wheel electronic traction control system is enabled, ESC and RSC are disabled



In 4A mode the center differential is electronically-controlled and rear drive wheel bias. The on-board computer monitors for any sign of rear drive wheel slip (loss of traction)

If loss of traction is detected, the center differential is told to send a share of the engine\'s torque to the front drive wheels. It will not let the front driveshaft turn at the same speed as the rear driveshaft.



What about traction management?

1997-2002 model Ford Expeditions offered an optional limited-slip rear differential (LSD). A conventional open rear differential was standard along with the conventional open front differential and the electronic locking center differential.

comment with out LSD, one tire can spin, on say ice.

but the other 3 tires dont, in full time.

Jul 04, 2014 | 2003 Ford Expedition

1 Answer

When i put the bike into gear it will not move. You can hear grinding from the rear. Any ideas?


Hi
That sounds like the bevel box gears at the rear wheel or the drive shaft to them
Pull back the rubber boot at rear of engine to check if shaft is rotating
remove rear wheel & check the output shaft from the bevel box is rotating
If not then remove bevel box & check splined join to drive shaft

Ride Safe
Bike-Doc

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1 Answer

Does torque increase with increase in backpressure


No ..rateded at RPMs and torque curves related fuel delivery and eng displacement..

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1 Answer

Shimano gears


Basically, avoid cross-chaining. That is, the right-most drive chainring with the left-most cogs, or vice-versa. They place excessive sideways torque on the chain (increasing friction and wear) while not prividing any unique gear ratios that a straighter chainline would provide. The rear derailleur may not be able to take up the slack of small-small riding; or your chain length may be sufficiently short that large-large combo will pull the derailleur to far forward, perhaps even damaging it. To illustrate for yourself what crosschaining does, manually shift your bike into the two described extremes then get behind the bike and sight along the top run of the chain. You'll clearly see that it forces two unnecessary sideways bends in the chain. That is really bad for the hardware.

Generally, the large chainring is for high wheel rpm's but low rider torque, so stay toward the same side (medium-smaller cogs) of the cassette in the rear to maintain higher speeds.

Conversely, the granny gear (smallest chainring) is for high torque, low speed conditions and it works best with its same side (medium-larger) cogs on the rear. The middl ring works with all of the cogs in the rear and serves most off-road purposes that don't require extremes of speed or power.

Buy a few bicycle magaizines, visit bicycling.com and read up on shifting and everything else. It's worth it to get it right and ride smarter instead of harder.

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1 Answer

Lawn mower will start, but won't move????


If you have had either of the rear wheels off, remove the cover from the center and observe the shaft with the engine running and transmission in gear. If the shaft is turning, you have lost the 1/4 inch key that locks the axle to the wheel to make it go

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2 Answers

2000 GMC Jimmy SLT 4wd, 65k miles, baby'd, driven


bad transmission, it will need rebuilding or replacement. sorry....hopefully this helps

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1 Answer

Un usual rpm spikes


At a guess.... Your clutch is slipping. Higher gears and increased drag at hiway speeds put the most torque through the clutch and it sounds like that's when the plates start to slip. When you back off the plates grab again until the load over powers the plates again. But that's just a inter-guess through a computer screen...... ,,

Nov 10, 2008 | 2008 HM CRE F450XI

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