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Fantic 241 oil leak from Gearbox


Julian Taff
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Hi All .. I recently bought a fully restored Fantic 241 trial bike monoshock 1986 progress 1 version. I have used it only twice and I have a leak coming from the gear box.. It seems to be under the glass eye level rather than the gasket itself.. It's leaking quite a bit now so want to get it fixed asap as i want to use the bike.

 

I have spoken to someone who fixes bikes but he doesn't seem to know anything about the Fantic, and has asked me to get a filter and some oil? I don't know what filter i would be looking for, for the 241 although I have ordered a new glass eye and a full gasket set for a 241...

Can anyone also recommend a good ATF fluid which would be suitable for the gearbox in the fantic? 

 

If anyone can help would appreciate it. Also if anyone knows of anyone in Wales who knows a bit about trials bikes that would be of help too.

Thank you. Julian

 

Picture now added and oil seems to be coming out from underneath the glass eye

20170708_211144.jpg

Edited by Julian Taff
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The 241 is a very simple engine and has no oil filter. The sight glass does not normally cause problems. Very occasionally the casings do crack but this is unlikely. I notice that someone has fitted replacement bolts to hold the side casing on and this reminded me of when I did this myself and used bolts that were just a fraction too long resulting in the bolts bottoming out in their holes and although everything seemed tight, The casing was not quite being pulled against the other facing resulting in a very difficult to locate slow leak. I'd check that if I were you

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3 hours ago, blocky said:

The 241 is a very simple engine and has no oil filter. The sight glass does not normally cause problems. Very occasionally the casings do crack but this is unlikely. I notice that someone has fitted replacement bolts to hold the side casing on and this reminded me of when I did this myself and used bolts that were just a fraction too long resulting in the bolts bottoming out in their holes and although everything seemed tight, The casing was not quite being pulled against the other facing resulting in a very difficult to locate slow leak. I'd check that if I were you

That's fantastic advice, thank you so much. I will take one of the bolts out tomorrow and see what length it is. Luckily where I live we have a place called alpha fasteners which sell allen bolts in all sizes so will buy some slightly shorter ones just I case it is that.. You guys on here are fantastic an know your stuff :-)

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1 hour ago, fantic240motor said:

Replacement oil level viewers are available if your's is damaged. 

The oil leak will be simple to fix, these bikes aren't know to have oil leak issues. Should be easy enough to see where the oil is coming from.

Thank you for your help, I will keep you posted on how I get on..I have ordered a new oil level viewer and a full gasket kit for the 241 ... Hopefully get it sorted this week as I want to ride.

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Well it's not the bolts as bought 5mm shorter ones today and it started to bite the 1st one then just spun, so at least that's ruled that out... 

 

The bike is a 241, so think that's a 212cc engine not a 250..

 

I still think it's the glass eye thats the problem... do they just screw in or do you need to seal them with sealant?

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Alberto is referring to the ' engine type' plate shown in your photo, it clearly says FM403 that identifies it as a 250 size engine, I think you will find the 212cc size is an FM450.

Talk to a fantic spares specialist for more info, as I would not know if the clutch cover could be interchangeable therefore changing the engines identity !

 

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8 hours ago, Julian Taff said:

Is there any other way of identifying what size engine it is apart from the engine plate?

send us a picture of the engine (cylinder and head are different from 212cc and 250 cc) and gasket kit are differents

 

 

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