High revs issue...

SpannerMonkey · World Chat Champion Joined: 26 Aug 2010 Karma :

Okay, so I got my lil Tomos on the road and have been ragging it about merrily, ignoring the speedo thinking 'Surely I cant be doing 24mph, Feels like I'm doin 30 Smile

'
Fitted a cycle speedo and set up everything accurately. Indeed I am topping out at 25mph on the flat.
Retimed the engine spot on with the help of a 60 year old mechanic friend of mine, Checked compression and it does seem a little low at 102psi but surely that'd affect low end power more not top end?
She has a new plug, ultrasonic cleaned the carb and the metal mesh filter that comes with it. plug is reading spot on.

So thats fuel (Spot on), compression (Lacking slightly, but there) and ignition (Spot on)... Or is it?

Whipped plug out and earthed it, kicked it over... dull spark

This has now made me notice that every now and then I get a dull sounding quiet pop from the engine when at full whack but the thing is, she'll do 33mph downhill and doesnt sound like its misfiring majorly...

So my question to you guys... is what would you check/do next?
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My bike? A YX140 powered one-off Monkey Bike, something a little different!

P. · Red Rocket Joined: 14 Feb 2008 Karma :

102 seems quite low... that warm or cold?

SpannerMonkey · World Chat Champion Joined: 26 Aug 2010 Karma :

warmed up for 5 on idle
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My bike? A YX140 powered one-off Monkey Bike, something a little different!

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Then to me, it seems low.

Have you checked the top end yet? Done the usual bit of 2 stroke down the bore thing yet?

Only thing I noticed with low compression was it was a bugger to start when it was warm, even more so when cold Laughing

Was like 110psi too... so I'd want to check the top end personally.

Its an old baby too Laughing

Shouldn't take a man of your caliber long to do Wink

SpannerMonkey · World Chat Champion Joined: 26 Aug 2010 Karma :

Well I'm fitting a 70cc kit with a reedvalve conversion to aid the low end torque over the old straight piston port... Smile

should see me doing 40. I just need to ditch the encarwi carb and fit a Delly
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My bike? A YX140 powered one-off Monkey Bike, something a little different!

SpannerMonkey · World Chat Champion Joined: 26 Aug 2010 Karma :

Btw, congrats on the DVLA's fail =D
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My bike? A YX140 powered one-off Monkey Bike, something a little different!

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Thanks.

Well, tell you what... get on with the 70 conversion, worry about the revs when its all 70'd up Cool

The problem may piss off completely.

Mr. Green

SpannerMonkey · World Chat Champion Joined: 26 Aug 2010 Karma :

I damn well hope so... it's a nice kit to be honest, getting a nice zorst for it the week after hopefully Wink

should be good for about 45-50 then
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My bike? A YX140 powered one-off Monkey Bike, something a little different!

hazza · World Chat Champion Joined: 28 Sep 2005 Karma :

which kit are you opting for? The Athena? Heard good things about the kit but bad things about the reeds they come with!
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3 Honda NC50's(Sold)-->'72 Puch Maxi S (Sold, want it back!)--> '90 Yamaha RXS 100 (Stolen)--> '87 Honda Cub 90(Sold) --> '95 Kawasaki Eliminator (Sold) --> '98 Bandit 600 (Sold) -->'07 SV650S (Current)