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I have just built a li 150 engine this has been set up to take a TV175 barrel and piston NOS ,but i now want to fit a muggelo 186 kit ,but i don't know if i can use the new crank fitted to my engine its a GP road race crank with the 70mm con rod to work with the TV barrel and piston ,can anyone let me know if its ok and what i need or do i need to fit a new crank
thanks

Sorry that's a bit confusing.

Standard GP / Li crank is 107mmm rod and 58mm stroke
Standard TV crank is 116mm rod and 58mm stroke

The pistons have different piston heights to compensate(the distance between the gudgeon pin and the crown).

It very much depends on whether your 175 barrel/piston combination is a conversion barrel / piston with the 'standard' piston pin position for use with a 107mm rod or a genuine TV175 barrel and piston for use with the 116mm rod.

The Mugello barrel and piston will be designed for the standard 107/58 type crank so depending on what's in there now, you may need to change the crank. Otherwise you need a big packer.

You can get the Mugello barrel for the long rod you just need to make sure it's the correct one.

i have the mugello 186cc on my tv175, you can get a mugello kit that will take the 116 conrod! it runs fine!

I wasn't aware you could get a long rod Mugello, but even so I don't think it's clear which crank(s) the OP has

rossclark wrote:I wasn't aware you could get a long rod Mugello, but even so I don't think it's clear which crank(s) the OP has

It does say GP road race crank so I imagine it is 107/58 which will be fine for the Mugello!

Not sure what the 70mm bit means though?

Rich'

Yes but if this is a GP road race with 107 rod it can't be set up for a TV barrel surely? A GP crank could potentially be built with either rod. I've also no idea what the 70mm refers to either.

If it is he can use it with the regular Mugello but if it's set for a TV top end and a 116 rod he needs the other one mentioned above.

rossclark wrote:Yes but if this is a GP road race with 107 rod it can't be set up for a TV barrel surely? A GP crank could potentially be built with either rod. I've also no idea what the 70mm refers to either.

If it is he can use it with the regular Mugello but if it's set for a TV top end and a 116 rod he needs the other one mentioned above.

Absolutely Ross, I really think we need more info' from the o/p. Perhaps he just has a 175 conversion barrel and not a TV one,

Rich'

mike phoenix sold me the kit! the crank is a 58/116 conrod,glasgow lambretta are selling the same crank as mine!

rexton270s wrote:mike phoenix sold me the kit! the crank is a 58/116 conrod,glasgow lambretta are selling the same crank as mine!

Just to be clear - you have the Tv type Mugello with a 116/58 crank with GP taper?

rexton270s wrote:mike phoenix sold me the kit! the crank is a 58/116 conrod,glasgow lambretta are selling the same crank as mine!

Yep we realise that's possible but what has the o/p got?

yes mugello 186 gp taper and a 116 conrod! as i sayed the crank came from Glasgow lambretta!

rexton270s wrote:yes mugello 186 gp taper and a 116 conrod! as i sayed the crank came from Glasgow lambretta!

Now we've clarified that I can't wait to find out what the OP has...

Whats the OP?

dave411 wrote:Whats the OP?

Original poster

Ah,I see. I just hate abreveations.OK

NP

Thanks to you all for your help

I have spoken to Mike Phoenix as i got the crank from him and he can help ,I don't know where i got the 70mm from .but all i know its a GP 60mm road race crank
As for the barrel and piston i was going to use it is a all original New old stock TV175 barrel piston and head series 3

Ok as long as it has the longer rod then you should be fine with the 175 or the long rod type Mugello.

If it's the normal rod then your TV barrel and piston are no use and you'd want the normal rod type Mugello.