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johnny_t1970 |
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johnny_t1970 L Plate Warrior
Joined: 04 Oct 2018 Karma :
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Posted: 18:54 - 04 Oct 2018 Post subject: Speedfight 2 - 50cc - Belt Issues |
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My son has just taken on his brother's Speedfight 2, and seems to be having a problem with the belts shredding. He is losing patience with it now, so it has come down to me to sort it. I'm no moped mechanic, so bear with me if the terms aren't right. Also, it has been subject to all sorts of 'alterations' over the years by his brother, so almost nothing will be standard.
I decided to go back to basics and have got some new (Pollini 7g) weights to fit and a new belt as well. It looks like the rear pulleys aren't running that true, so I was going to try straightening them out a bit whilst I was in there.
However, from the look of it, it seems that the belt is rubbing on part of the belt cover casing (there is a low point, more or less above the middle of the kick start 'cog') which leads me to think that the front pulley is pushing the belt out too far, rubbing on the cover, heating it up and then eventually giving up.
Does this sound about right so far ?
Any advice from me to not drive it to the max at all times falls on deaf ears, so is there any other solution to making it not go out so far, or anything that could alleviate the problem ? |
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Sister Sledge |
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Sister Sledge World Chat Champion
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Sister Sledge |
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Sister Sledge World Chat Champion
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Riejufixing |
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Riejufixing World Chat Champion
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Posted: 22:43 - 04 Oct 2018 Post subject: Re: Speedfight 2 - 50cc - Belt Issues |
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johnny_t1970 wrote: | almost nothing will be standard.
I decided to go back to basics and have got some new (Pollini 7g) weights to fit and a new belt as well. It looks like the rear pulleys aren't running that true, so I was going to try straightening them out a bit whilst I was in there.
However, from the look of it, it seems that the belt is rubbing on part of the belt cover casing (there is a low point, more or less above the middle of the kick start 'cog') which leads me to think that the front pulley is pushing the belt out too far, rubbing on the cover, heating it up and then eventually giving up. |
It should be able to take being ridden flat-out all the time.
If the belt's rubbing on something, there is a problem.
Is the variator (the "front pulley") original? I can't think why anyone would change it, but... also, is it put together properly (refer to the manual pointed out)?
Is the clutch original (ditto)?
If the starter mechanism put together properly and not somehow deflecting the belt?
Is the belt the right one (not wider than original)?
Is the belt drive casing correct?
I can't really think of anything else, unless it's something outrageous like "wrong crankshaft fitted".
Photos? |
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johnny_t1970 |
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johnny_t1970 L Plate Warrior
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Sister Sledge |
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Sister Sledge World Chat Champion
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johnny_t1970 |
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johnny_t1970 L Plate Warrior
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Riejufixing |
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Riejufixing World Chat Champion
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Riejufixing |
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Riejufixing World Chat Champion
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johnny_t1970 |
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johnny_t1970 L Plate Warrior
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Riejufixing |
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Riejufixing World Chat Champion
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Riejufixing |
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Riejufixing World Chat Champion
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johnny_t1970 |
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johnny_t1970 L Plate Warrior
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andyscooter |
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andyscooter World Chat Champion
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Riejufixing |
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Riejufixing World Chat Champion
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stevo as b4 |
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stevo as b4 World Chat Champion
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Riejufixing |
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Riejufixing World Chat Champion
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johnny_t1970 |
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johnny_t1970 L Plate Warrior
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Posted: 13:58 - 07 Oct 2018 Post subject: |
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Riejufixing wrote: | Should last longer that 10 miles! Looks as though it's been going around sideways. Too long? |
That's a couple of people have mention going round sideways now, but I can't quite picture what you mean by it...
The current belts are from Tecnium, but I am leaning towards them maybe being too long (I bought two, one of which is now in bits, and one of which I am yet to refit). Am going to check, double and and triple check and maybe buy another. I'm in a slight catch-22, in that I don't want to spend out too much on belts, if something else is the issue, but of course, if I go too cheap then I am causing another issue altogether.
In theory, is there anything obviously dicey about using something like this - https://www.pedparts.co.uk/product/1255/motoforce-racing-kevlar-peugeot-drive-belt ? |
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Riejufixing |
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Riejufixing World Chat Champion
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Posted: 16:01 - 07 Oct 2018 Post subject: |
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https://www.pedparts.co.uk/product/1255/motoforce-racing-kevlar-peugeot-drive-belt
That says 17.8mm x 8.3mm x 764mm. Your eBay belt was SRCV-17.5-765, so very near the same length.
I don't think a couple of millimetres will make a noticable differences. A quick look on t' net shows that's probably the correct length for the bike; if for instance it was should have 724 mm and a 765 were fitted, that might be a problem! But it's likely to be something else I guess.
The belt should go flat with "teeth" inwards, so by "sideways" I meant on edge (twisted) in the pulley (e.g. if it was too long). But hm. Some bloke from 49ccscoot.com says he's had cheap belts break in 10 miles
I can't find your "SRCV-17.5-765" belt so maybe it's an "unusual" one. I can't think Pedparts would sell utter crap. |
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u33db |
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u33db Renault 5 Driver
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Riejufixing |
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Riejufixing World Chat Champion
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johnny_t1970 |
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johnny_t1970 L Plate Warrior
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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Old Thread Alert!
The last post was made 5 years, 215 days ago. Instead of replying here, would creating a new thread be more useful? |
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