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[f3nt0n]

Hi everyone - my son's Gilera runner 50cc needs attention - I want to take a look at the reeds under the inlet manifold but it's secured in using what looks like (arrgghh!) a RIVET of some kind - any idea what it is?

Can't plier it out, doesn't seem to be some form of cap (though I may be wrong) and it won't budge.

PIC - http://www.fent.pwp.blueyonder.co.uk/runner1.jpg

Any help appreciated. Cheers.

[bored bigyin54]

have you tried turning it . maybe it turns  i used to have a puch maxi . in the 1980 . to make it run better i used to remove the exsaused . and burn it out with a blow lamp

[tunnie]

Have you looked at the picture Ralf? Not sure how you could get any grip on that.

Does look like a rivet, normal bolt other side?

Guess drill it out? Might want to get a spare replacement bolt though!

[mantahatch]

That looks like a sheerbolt. need hammer and centre punch to undo.

Used to use a similar thing on steering locks on cars. Kinf of anti tamper device. But usually come undone ok. At least all the one's I have done have. Oh almost forgot, did have a failure on one.

Sheer bolts have normals heads which sheer off at a pre determined torque. like this http://www.lrseries.com/shop/product/listing/13679/100/1/51K4001L-STEERING-COLUMN-LOCK-ASSEMBLY-SHEAR-BOLT.html

[bored bigyin54]

Have you looked at the picture Ralf? Not sure how you could get any grip on that.

Does look like a rivet, normal bolt other side?

Guess drill it out? Might want to get a spare replacement bolt though!

have looked at picture . it look like a plastic piece ,so maybe able to turn it with the bolt undone , and taken out.

[b4ndit]

looks like a sheerbolt to me

[omega3000]

Get some mole grips on it , it should move 

[stewart000]

maybe a nut on the other side,
could try and cut a slot in it and use large screwdriver
or might be able to grip it with mole grips

[f3nt0n]

no nut on other side - it screws directly into the engine casing - I'll try mole grips and twisting - I can't understand why anyone would put a sheer bolt on there - I've taken a few of these mopeds apart and never come across it before.

[tunnie]

Have you looked at the picture Ralf? Not sure how you could get any grip on that.

Does look like a rivet, normal bolt other side?

Guess drill it out? Might want to get a spare replacement bolt though!

have looked at picture . it look like a plastic piece ,so maybe able to turn it with the bolt undone , and taken out.

Looks metal to me, being round think mole grips will slip like mad.

Looks like copper? Maybe file a flat edge to get some grip on it 

Have you got a welder? Could always weld a nut on the top?

[aaronjb]

That looks like a sheerbolt. need hammer and centre punch to undo.

Yup, I'll second that.

Maybe it's an anti-tamper measure so that the power rating can be guaranteed? (Aren't new riders etc limited in bhp these days?)

[mantahatch]

no nut on other side - it screws directly into the engine casing - I'll try mole grips and twisting - I can't understand why anyone would put a sheer bolt on there - I've taken a few of these mopeds apart and never come across it before.

Anti tamper, to stop people increasing the HP of a 50cc, it maybe how the restrict its power for the UK market. Or if they do remove it, it is obvious it has been done if you put a normal bolt back in. Or maybe to do with warranty.

[mantahatch]

That looks like a sheerbolt. need hammer and centre punch to undo.

Yup, I'll second that.

Maybe it's an anti-tamper measure so that the power rating can be guaranteed? (Aren't new riders etc limited in bhp these days?)

Dam must type quicker 

[Kevin Wood]

have you tried turning it . maybe it turns  i used to have a puch maxi . in the 1980 . to make it run better i used to remove the exsaused . and burn it out with a blow lamp

That takes me back. A school mate of mine had one. He removed the exhaust. Not deliberately, but he was knocked off it on the way home from school by our maths teacher's wife in her Morris Ital then left the scene without it due to the embarrassment so I carried the exhaust home and told him to come and get it if he wanted it back.

[f3nt0n]

OH YEAH BABY!

Mole grips, monster squeezing and twisting does the job!

Thanks for all the replies - you guys are awesome.