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Re: lambretta 290 rotax

Posted: Thu May 03, 2018 10:24 pm
by hendy
Absolutely brilliant result. You must be chuffed to bits.

Re: lambretta 290 rotax

Posted: Fri May 04, 2018 12:37 pm
by holty
hendy wrote:
Thu May 03, 2018 10:24 pm
Absolutely brilliant result. You must be chuffed to bits.
yes very pleased, im looking forward to getting some more milage on it now and giving it some welly :D

Re: lambretta 290 rotax

Posted: Sat May 05, 2018 7:58 am
by eden
holty wrote:
Thu May 03, 2018 9:25 pm
yeah your right garry, max torque and bhp between 7 and 8k, its pulls so hard, no wonder the clutch struggles, it sounds way better now its set up right, i will try and get a video loaded up, i had to put my fingers in my ears when it was in full song on the rollers.

Be a much nicer ride than the green graph :)

Re: lambretta 290 rotax

Posted: Sat May 05, 2018 10:53 am
by cartmel808
Brilliant result that & a brilliant thread... really enjoyed watching this develop... well done!




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Re: lambretta 290 rotax

Posted: Wed May 09, 2018 10:23 pm
by holty

Re: lambretta 290 rotax

Posted: Fri May 11, 2018 7:38 am
by RManson
Sounds good Holty and a decent number to boot eh?! Glad to see it's going well! What sort of timing curve are you using?

Re: lambretta 290 rotax

Posted: Fri May 11, 2018 12:32 pm
by holty
RManson wrote:
Fri May 11, 2018 7:38 am
Sounds good Holty and a decent number to boot eh?! Glad to see it's going well! What sort of timing curve are you using?
cheers ryan,
im running 17 degrees static timing using one of anthony tambs external pick up and his dc ignition box running straight from the battery, it might make more power with an ignition curve to the rotax specs, something i might add in the future, hows yours coming along ?

Re: lambretta 290 rotax

Posted: Thu May 17, 2018 7:40 pm
by holty
well finally got my rear runners and side panels fitted, looks almost like any other scooter now, had a little ride out last night for an hour or two, ran well, no problems
ImageUntitled by stephen holt, on Flickr
ImageUntitled by stephen holt, on Flickr
Image32631004_1286556971479317_5126740777191342080_n by stephen holt, on Flickr
Image32669604_1286556601479354_6531269712335077376_n by stephen holt, on Flickr
Image32740288_1286556701479344_1896852089867337728_n by stephen holt, on Flickr

Re: lambretta 290 rotax

Posted: Fri May 18, 2018 5:58 am
by RManson
Looking good Holty! What kind of coolant temps are you seeing? Must be maintaining decent temps otherwise that overflow tube would be giving you quite the surprise once it got hot! :D

I'm running similar initial timing specs, 17 degrees BTDC, total around 24 for now. Will play with it a bit, but it seems happy there. Do you have an EGT gauge fitted? If so, what temps are you seeing? How is the exhaust working out?

Re: lambretta 290 rotax

Posted: Fri May 18, 2018 9:52 am
by holty
RManson wrote:
Fri May 18, 2018 5:58 am
Looking good Holty! What kind of coolant temps are you seeing? Must be maintaining decent temps otherwise that overflow tube would be giving you quite the surprise once it got hot! :D

I'm running similar initial timing specs, 17 degrees BTDC, total around 24 for now. Will play with it a bit, but it seems happy there. Do you have an EGT gauge fitted? If so, what temps are you seeing? How is the exhaust working out?
hi ryan,
had no overheating at all, we havnt had very warm tempratures though and that might change things, but it stays around 50 degrees c and the very small fan does reduce it slightly when switched on, even sat at traffic lights for long periods it stays cool. ive not fitted an egt gauge yet, i might do in the future, i dont think i really need it as its been set up on the dyno. exhaust works well, ive got the scoot way overgeared its a gt200 gearbox on a 17 46 which gives 3.9 top gear ratio and it will still pull it, it has a slight flat spot just before it comes on the pipe but goes well after that