Typhoon 80 max out at 30mph

[Ichy]

My son has a Piaggio Typhoon 80. He has owned it for 3 months and it has never felt quite right, max speed was about 40mph. The oil pump failed about a month ago so I replaced the piston, main bearings and seals.

Main jet was changed from a 62 to a 68 since the last owner fitted a sports exhaust. Colourtune shows it rich at idle and slightly lean at full throttle. Compression has been checked and it reading about 118 PSI, no idea what is good?

The main problem is that it is unable to go much over 30 on the flat. Bike seems to be reving just fine but not gaining any speed. If he goes downhill it will hit 60 easily. Up hill and hes lucky to get 20.

I'm at a loss on this one. I've noticed the plating on the belt side of the variator is peeling off, would this make any difference? Is there anyway to check the variator or clutch?

I'll strip and clean the carb again tomorrow, for the third time.
____________________
https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[ms51ves3]

It could be roller weights. When it is doing 30mph, are the revs quite low or is maxing out?

[Ichy]

I changed the rollers today because the old ones were looking a bit squared off. The originals were 7.6g but the ones I've fitted are 6.7g since they were all I had lying around. Didn't seem to make any difference.

Good question about the revs. I would have to say that they appear to be about right for the speed, certainly not revving out.
____________________
https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[Ichy]

Belt doesn't look shiny, should it? Clutch looks fine although all I did to check it was to rev the bike up and hold the brake, it just slows down.
____________________
https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[ms51ves3]

[Ichy]

I'm guessing at one of two things.

Either the variator isn't closing or the bike just isn't generating enough power. Like I said, I'm going to attack the carb again tomorrow. I'd like to try a slightly bigger jet but I'm struggling to find any in stock. Does 118psi seem ok for compression? I tried oil on the rings and it made no difference whatsoever. I might have a look for a replacement carb, maybe a new reed block and manifold. Running out of bits to change!
____________________
https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[Ichy]

[MarJay]

IIRC 118 Psi is really good for a two stroke engine.
____________________
British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Ichy]

Carb is clean. 72 jet is too rich and fouling the plug so I'm back on the 68. Adjusted the idle mixture so its correct based on a colourtune. Completely out of ideas. I'll be glad to see the back of this one.
____________________
https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[ms51ves3]

[BenR]

I agree with ms51ves3 from your descrition it sounds like it's drive related not engine. I would take the variator off (probably best to replace it they're not expensive) replace the belt as well & check the clutch.
____________________
Current bikes: suzuki RG125UN wolf. Yamaha MT-07

[ms51ves3]

[Ichy]

Guys, thanks for all the suggestions. ms51ves3, before I order them what weight are you suggesting? I'm guessing about 4g?

CHR15, good call but the seals are fine, the crank was knackered on the bearing and seal faces after it seized so I turn them down, fitted collars and turned them to size. Everything by the book mate, even down to the 0.3mm end float for the main bearings.

After another day of tweaking we are up to 40mph on the flat! If this thing is ever fixed it will fly!! Anyone got a geared bike they want to swap for a slightly ill Typhoon?

Jeez never had this much trouble with my own bikes, kids a Jonah I tell ye.
____________________
https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[lurer]

are you sure that the previous owner derestircted the sports exhaust he put on ?
also what make is the exhaust ?
____________________
red and carbon fibre peugeot speedfight 50cc

[BenR]

[Ichy]

Right. Its a 80cc so, to the best of my knowledge, there are no restrictions in the pipe or in the variator. Off the top of my head its a '98 and the mileage is about 5k. Two owners before my boy had it. First was Ferrari who used it as a pit bike. Next owner rode it for a bit then stored in his garage for 4 years.

To get the extra 10mph today I stripped and cleaned the carb then reset the mixture. I also stripped the variator and removed all the old grease.

Would the fact that it will do 60+ down a gentle hill suggest that the variator is ok and its the fact that the bike isn't generating enough revs on the flat that is the real problem?
____________________
https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[lurer]

[Ichy]

[Ichy]

[BenR]

Not being funny but are you sure it's an 80cc? Someone might have stuck a 50cc barrel & head on it if it's seized at any point in its life. Other than that I still think it's drive related. This is a good place for parts. https://www.glrscooters.co.uk/ I used to work in their Bedford branch.
____________________
Current bikes: suzuki RG125UN wolf. Yamaha MT-07

[lukamon]

would still check the variator for restrictions, you never know.
____________________
killa wrote: Im an ass man myself

[BenR]

There are no restrictions via the variators on piaggios, only exhaust.
____________________
Current bikes: suzuki RG125UN wolf. Yamaha MT-07

[Ichy]

[K0rnIsAFAGGOT]

[Ichy]