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Hyper 21... Rip?


Stu iles

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Take the cooling head off, then remove the head button. Look for metal shavings, scoring, and whether the piston still won't move with no compression.

 

Also worth taking off the backplate and checking out the flywheel/conrod if you can't see anything from the top

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Take the cooling head off, then remove the head button. Look for metal shavings, scoring, and whether the piston still won't move with no compression.

 

Also worth taking off the backplate and checking out the flywheel/conrod if you can't see anything from the top

Cool. Cheers

Will take pics

Then you lot can advise me what to do next... Fix or new engine

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I am yet to see one of these little engines seized, I would not think it is possible due to the tapered liner.

 

As said...head off...backplate off...if everything looks ok......

Then...liner out...piston/rod out....spin the crank...bearings?

 

Edi- at least parts are cheap...basically a new engine for small money... http://www.ebay.co.uk/itm/HOBAO-HYPER-7-21-3-port-piston-and-liner-with-con-rod-inc-free-crank-case-NEW-/251585752847?pt=UK_ToysGames_RadioControlled_JN&hash=item3a93adef0f

Edited by Anthoop
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  • 1 month later...

Finally got around to looking

Liner was scored and piston was catching when it was at its lowest point

Bought another engine off here, stripped and added pull start mechanism from old one and other bits that were needed

Fitted it all, started after a dozen or so pulls

Just need to tweak a little

Chuffed as never done before and it worked

It is hard work being a big kid

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