Derestricted cagiva won't pass 70mph

[Jack_Cheese]

Hi, i've got a cagiva planet 125, and it won't pass 70mph. I've already posted on 125ccsportsbikes, but alas there are no results. The gearing is stock, and the engine is reaching maximum revs in 6th gear, but it just isn't pulling the top speed it should. The only thing i can think of is that my clutch is thoroughly shagged, as it's the only place i can think of such a differential between engine speed and rear wheel speed happeneing.

How far should i be able to release the clutch lever before it bites? Mine only bites about a centimetre before the end of it's travel.

Cheers

Jack
____________________
www.bikepics.com/members/jackcheese <--- NOW FOR SALE! 51 Plate Cagiva Planet 125
Quacker_boy: "Jack, you really are a dick!"

[craigs23]

Clutch slip? Does it try and drive in the lower ratios but feel like the power's not being transmitted to the road?

[Jack_Cheese]

It bites well in the lower gears, but when i poen the throttle in 5th and 6th, the power and change in revs just don't seem to get transmitted to the road. I'm totally stumped!

Jack
____________________
www.bikepics.com/members/jackcheese <--- NOW FOR SALE! 51 Plate Cagiva Planet 125
Quacker_boy: "Jack, you really are a dick!"

[no_shad]

How do you know it's reaching maximum revs in 6th gear?
It's a cable operated clutch, it doesn't take a genius to adjust it. There's an adjuster at the the lever and also just before it connects to the actual clutch unit at the engine.

[Jack_Cheese]

There's a bit of free play in the clutch lever, and i can tell by the engine noise that it's revving out in 6th. I get it well up into the powerband in 5th, then up into 6th and it keeps revving, but not pulling.

The clutch moves about 7-8 mm back with no resistance, then a bit more and it releases the clutch. It doesn't feel right to me. Does it sound right to you?

Jack
____________________
www.bikepics.com/members/jackcheese <--- NOW FOR SALE! 51 Plate Cagiva Planet 125
Quacker_boy: "Jack, you really are a dick!"

[Kickstart]

Hi

Is there a direct relationship in 6th gear between speed and revs. EG, at 35 is it doing half the revs that it is at 70? If there is then the clutch is probably fine, if not then the clutch is probably shagged (or if you have really abused the chain, one of the sprockets is bald).

Generally it is fairly easy to fit new clutch plates.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[no_shad]

You may just need to adjust the clutch, try moving the biting point closer to the bar.
Pull the rubber cover back and screw the adjuster in towards the lever a bit to feed the clutch some slack.
If it's already tight against the lever then you'll need to adjust it at the other end on the engine.
https://img84.imageshack.us/img84/8240/clutch4ti.jpg

[Jack_Cheese]

Sprockets are fine and the chain is new. The old front sprocket bolt was being held on by the sprocket cover, though which is why my old chain got so screwed so quickly. I'll have a go at adjusting the clutch if millenium don't pick it up on the MOT.

Cheers for your help guys!

Jack
____________________
www.bikepics.com/members/jackcheese <--- NOW FOR SALE! 51 Plate Cagiva Planet 125
Quacker_boy: "Jack, you really are a dick!"

[Jack_Cheese]

Well, it failed it's MOT today.

front tyre low
no rear reflector
brake pads and disc contaminated thanks to
bust oil seal in right fork
and the rear wheel bearings are shagged.

Got quoted £300 to set it right by MMC, but i'll get the work done at fazakerly garage for £150ish, and the front tyre at MMC because fazakerly can't do tyres apparently...

I think the rear wheel bearings may have been the problem, causing the clutch to slip at speed.

Jack
____________________
www.bikepics.com/members/jackcheese <--- NOW FOR SALE! 51 Plate Cagiva Planet 125
Quacker_boy: "Jack, you really are a dick!"

[cagiva gezzer]

What your gearing details into this and it'll tell you whatspeed you should be hitting.

Bearings £5/10 a side, seals £20 a pair for cagiva ones.
____________________
"because one stroke isnt enough and four strokes waste two"

[Jack_Cheese]

14t front 43t rear sprockets which translates to 95mph.

Jack
____________________
www.bikepics.com/members/jackcheese <--- NOW FOR SALE! 51 Plate Cagiva Planet 125
Quacker_boy: "Jack, you really are a dick!"

[peterfisher]

First time i've heared of worn rear wheel bearings causing a clutch to slip

[Jack_Cheese]

If there's increased resistance, and the clutch is improperly adjusted, it becomes the main source of a differential between engine and rear wheel speed. Power doesn't make the rear wheel turn faster, the rear wheel speed is always proportional to the engine speed. The proportion changes depending on what gear your in, and is fixed in each gear. For the proportion to be out, there must be slip.

Jack
____________________
www.bikepics.com/members/jackcheese <--- NOW FOR SALE! 51 Plate Cagiva Planet 125
Quacker_boy: "Jack, you really are a dick!"

[Kickstart]

Hi

Wheel bearings will not cause clutch slip. Cost will be around £5 per bearing, with 2~4 bearings needing replacing depending on the bike (most bikes have one each side and one in the sprocket carrier, some bikes have 2 bearings on one side).

Not sure about the reflector. Have a feeling (maybe totally wrong) that the Planet rear light has the reflector built in.

Pads are cheap and easy to do. Disk just needs cleaning up with brake cleaner.

That just leaves the front tyre and the fork seal. Not sure on cost of a seal from Cagiva (Marzocchi seals for the Bimota are dirt cheap) and it might be a touch tricky to fit to a USD fork. However take the fork out and into a bike shop and most places will fit the new seal for you for a nominal amount.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Jack_Cheese]

The only way i have for supporting the bike when the forks are off would be axle stands on the engine mounts, which i don't really want to do. The fork seals are £80 including fitting (2 hours labour) the bads are fairly new ebcHH sintered items, last time i decontaminated them using a pressure washer and lemon juice, and it worked a treat (obviously removed them first). I just decontaminated the disc with half a lemon and some sandpaper.

I've learned that my bike may be an import, the light is "kicking up on the offside" as the MOT put it, but the V5 says it was declared new at the time of first registration.

RE: the gearing table, i checked the gearing, and it should do 30 in first gear. I just revved it 'till it wanted to go BANG! and it hit 30 in first.

Jack
____________________
www.bikepics.com/members/jackcheese <--- NOW FOR SALE! 51 Plate Cagiva Planet 125
Quacker_boy: "Jack, you really are a dick!"

[scampypants]

get the parts, call in the bell and well sort it for a few pints, have you tried getting it mot`d somewhere else . cant believe the amount of money they want for those jobs

regards badge