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Re: lambretta 290 rotax

Posted: Sat Mar 03, 2018 10:46 am
by garry inglis
Great work must be pleased as you have built and took a chance on a lot of different methods to end up with home built engine and also you'll have to put a vid up of starting the scoot in that strange looking lawnmower 😂

Re: lambretta 290 rotax

Posted: Sat Mar 03, 2018 12:53 pm
by holty
garry inglis wrote:
Sat Mar 03, 2018 10:46 am
Great work must be pleased as you have built and took a chance on a lot of different methods to end up with home built engine and also you'll have to put a vid up of starting the scoot in that strange looking lawnmower 😂
ha ha, yes i will garry, its a great little addition to the garage, i started the beast with it last week, and took it round to my mates who couldnt get his to start, it soon fired it up, i will get a video when the weather improves, yes im realy pleased with the end result, i was a bit worried along the way it would just feel like a ts1, not that i dont like a ts1 they can be fantastic, i wanted a big thumper and thats what ive got, i never expected it would be such a powerhouse at low revs,and so smooth and clean pulling away, it will do 30mph in top gear, and yet it will do way over 100 mph if it will do enough revs in top gear, which i suspect it will, im looking forward to getting it run in, and then on the dyno, ive still got a few little things to do as well.

Re: lambretta 290 rotax

Posted: Tue Mar 13, 2018 1:03 pm
by hungdog
Quick question what was the piston crown height of the 580 piston you used ? 31mm

Ta

Re: lambretta 290 rotax

Posted: Mon Mar 26, 2018 9:37 pm
by holty
hungdog wrote:
Tue Mar 13, 2018 1:03 pm
Quick question what was the piston crown height of the 580 piston you used ? 31mm

Ta
sorry i dont remember off the top of my head, it was a wiseco piston, i can get you the part number if you need it, it was the standard size, are you dipping your toe in the water and building one too ?
best regards,
holty

Re: lambretta 290 rotax

Posted: Mon Mar 26, 2018 9:45 pm
by holty
been out on the scoot twice this week, ran fine on wednesday night, but on sunday seemed to develop a bit of a rattle, had a look around and one of my exhaust mounts had snapped, so i tacked it back together, then added a couple of gussets, i dont think it will break again, done over 200 miles now.
ImageUntitled by stephen holt, on Flickr
ImageUntitled by stephen holt, on Flickr

Re: lambretta 290 rotax

Posted: Tue Mar 27, 2018 5:36 am
by garry inglis
That looks like something of my mk1 cortina 😂😂

Re: lambretta 290 rotax

Posted: Wed Mar 28, 2018 3:59 am
by onthelam
OK just needs a bit of grinding and a lick of paint.

Re: lambretta 290 rotax

Posted: Thu May 03, 2018 6:08 pm
by holty
took the rotax up to martin at chiselspeed today for setting up on the dyno
ImageUntitled by stephen holt, on Flickr
very pleased with the end result, max power 32.11 and max torque 23.16,
had to change atomiser and jets and needle to get fueling corrected
ImageUntitled by stephen holt, on Flickr
makes a lot more power than a casassr265 until 8k revs which im well chuffed with for a home tune and also made more torque than the casa.
ImageUntitled by stephen holt, on Flickr
do have a little bit of slip on the clutch, so ive got some stronger springs to install, also slight leak from downpipe / exhaust joint going to make a clamp to fix this issue, it was mega loud by the way, hurt my ears.
:D

Re: lambretta 290 rotax

Posted: Thu May 03, 2018 6:41 pm
by garry inglis
looks good holty the hp and fbt are both on the same curve right through itll pull your arms off well done mate chuffed for you

Re: lambretta 290 rotax

Posted: Thu May 03, 2018 9:25 pm
by holty
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.