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GT240 Piston

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GT240 Piston

Postby Leotech » Sat Mar 23, 2019 12:30 am

What piston is used in the GT240 kit? Mine seized up today on the motorway after 14 months trouble free except 2 reed breakages.
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Re: GT240 Piston

Postby Scooterdude » Sat Mar 23, 2019 6:06 am

Pretty certain it’s a Suzuki TS250 Piston made by Mitaka so available through Grampion motors. You will need to cut ports and crescent to match yours though.
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Re: GT240 Piston

Postby GeorgeS » Sat Mar 23, 2019 11:53 am

You can contact Eden Bakewell on Facebook directly or via the Spliffspeed page, he can supply a piston with the modifications already, but I think he's on holiday at the moment.
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Re: GT240 Piston

Postby GeorgeS » Sat Mar 23, 2019 11:55 am

BTW, do you know what caused the sieze?
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Re: GT240 Piston

Postby coaster » Sat Mar 23, 2019 12:14 pm

Scooterdude wrote:Pretty certain it’s a Suzuki TS250 Piston made by Mitaka so available through Grampion motors. You will need to cut ports and crescent to match yours though.


Your best bet is Richard Taylor directly as he has a large stock of pistons and the piston mods are CNC machined rather than hand cut.

I'd be doing a leakdown test before stripping it, sounds like an air leak issue.
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Re: GT240 Piston

Postby Scooterdude » Sat Mar 23, 2019 6:39 pm

coaster wrote:
Scooterdude wrote:Pretty certain it’s a Suzuki TS250 Piston made by Mitaka so available through Grampion motors. You will need to cut ports and crescent to match yours though.




I'd be doing a leakdown test before stripping it, sounds like an air leak issue.

Yes. Good call...
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Re: GT240 Piston

Postby Leotech » Sat Mar 23, 2019 9:29 pm

Think I forgot to put oil in. The fuel tank was leaking before Christmas, I had it welded and filled it from a can ages ago. I thought there was oil in the can prior to getting the fuel buts its over a month ago so cant remember.

I'm a toolmaker, I can cut holes and I can get pistons through an off road company I have a trade account with for my business for much less cost.

Its not an air leak or anything, its run fine and at good speeds for 1000's of miles last year. If its not no oil then its probably just a cold seizure, I maybe went to fast too soon only done 5 or 6 miles at most when it nipped. It sounds very metallic now when I kick it over which indicates no oil.
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Re: GT240 Piston

Postby Leotech » Sat Mar 23, 2019 9:37 pm

GeorgeS wrote:You can contact Eden Bakewell on Facebook directly or via the Spliffspeed page, he can supply a piston with the modifications already, but I think he's on holiday at the moment.



I had nightmares with it to start with but becasue of Eden it got recalled, since then its been great to be fair to them. He was helpful.
Last edited by Leotech on Fri May 10, 2019 2:10 pm, edited 2 times in total.
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Re: GT240 Piston

Postby GeorgeS » Sun Mar 24, 2019 5:19 pm

Just checked a box I have, it is indeed labeled as a Osaka TS250-ER piston.
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Re: GT240 Piston

Postby Leotech » Sun Mar 24, 2019 5:54 pm

GeorgeS wrote:Just checked a box I have, it is indeed labeled as a Osaka TS250-ER piston.



Thanks George.
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Re: GT240 Piston

Postby Leotech » Sun Mar 31, 2019 6:23 pm

Worked out the seizing issue. After I had the tank welded I went to fill it with fuel before before a test ride and made the schoolboy error too much fuel and couldn't get the oil in. Put in enough oil for 3 litres when I'd filled with 9 litres. Rode home 3 miles and would put the rest of the oil in.

Got home noticed headlight wasn't working so started to fix lights. Eventually gave up as found broken wires behind headlight and went out on another Lamby. 3 or 4 weeks pass and I fix the lights and totally forget to add the two stroke oil! So it had 13 litres of fuel in with enough oil for 6, GT240 kits won't run on 1.5% oil ratio!
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Re: GT240 Piston

Postby Covboy » Sun Mar 31, 2019 7:34 pm

I always over fill :oops: I carry a big syringe for removing excess fuel so I can add the right amount of oil.
I now also put in the approximate amount of oil in before I fill up. if I judge I need 6 litres I put in the right amount of oil on for five litres, then add the extra afterwards.
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Re: GT240 Piston

Postby coaster » Sun Mar 31, 2019 8:00 pm

Running it without oil won't have done the small end and big end bearings any favours, probably why it seems rattly :(
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Re: GT240 Piston

Postby Leotech » Sun Mar 31, 2019 10:00 pm

Covboy wrote:I always over fill :oops: I carry a big syringe for removing excess fuel so I can add the right amount of oil.
I now also put in the approximate amount of oil in before I fill up. if I judge I need 6 litres I put in the right amount of oil on for five litres, then add the extra afterwards.



I know all that but I never think I'm dumb enough to over fill them! ha ha ha !

I may strip it tomorrow. Hopefully piston nipped before crank took a hit.
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Re: GT240 Piston

Postby burnside » Mon Apr 01, 2019 10:40 am

There's a good reason why I always put the oil in 1st, a little too much or too little is never a problem
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Re: GT240 Piston

Postby Rich Oswald » Mon Apr 01, 2019 12:34 pm

Covboy wrote:I always over fill :oops: I carry a big syringe for removing excess fuel so I can add the right amount of oil.
I now also put in the approximate amount of oil in before I fill up. if I judge I need 6 litres I put in the right amount of oil on for five litres, then add the extra afterwards.


Exactly what I do,

Rich'
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Re: GT240 Piston

Postby coaster » Mon Apr 01, 2019 12:54 pm

I also put the oil in first but it caught me out once on my old T5 when I put oil in for a full tank and then realised that I only had cash and it was a card only forecourt :oops: Quite a smokey ride to the next garage....smooth though 8-)
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Re: GT240 Piston

Postby ULC Soulagent » Mon Apr 01, 2019 4:58 pm

I use an broomshaft cut too fit under my bench seat and cut notches into it for every lts of fuel I put in when on new long range tank. Now it’s a case of a quick dip with the stick and working out how many lts and oil I need :D
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Re: GT240 Piston

Postby coaster » Mon Apr 01, 2019 6:32 pm

ULC Soulagent wrote:I use an broomshaft cut too fit under my bench seat and cut notches into it for every lts of fuel I put in when on new long range tank. Now it’s a case of a quick dip with the stick and working out how many lts and oil I need :D


I do the same but use a piece of dowel, copied the idea off the late Dave Jackman 8-)
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Re: GT240 Piston

Postby ULC Soulagent » Mon Apr 01, 2019 11:11 pm

coaster wrote:
ULC Soulagent wrote:I use an broomshaft cut too fit under my bench seat and cut notches into it for every lts of fuel I put in when on new long range tank. Now it’s a case of a quick dip with the stick and working out how many lts and oil I need :D


I do the same but use a piece of dowel, copied the idea off the late Dave Jackman 8-)

Think I got the same idea from some fella doing it, might have been Mr Jackman but does the job without looking into Mistque Megs futures think tank :lol:
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