I'm back and here to stay

Post your problems / information on the smaller GT Models here
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kawonda750
Posts: 17
Joined: Sat Nov 09, 2019 12:42 pm

I'm back and here to stay

Post by kawonda750 »

I have sold my Kawasaki triples and have now bought, and plan to keep, a 1974 GT550.
I am doing a complete rebuild on the engine and have purchased a set of IMD +1.0 mm pistons. Stated piston to cylinder clearance is listed as 0.0015 inches. My machinist says this seems too tight. Has anyone any experience with these pistons and, is this clearance correct? It is the iron sleeved engine.
Also, greetings from Canada.

Looking forward to this bike. Thanks
badgereng
Posts: 38
Joined: Fri Oct 22, 2021 7:59 pm

Re: I'm back and here to stay

Post by badgereng »

I used +0.5mm IMD pistons in my GT380. The workshop that did the rebore used the IMD recommendations of piston dia + 1.5 thou for the two outer pistons BUT made the centre bore an additional half thou bigger.
They’d done a million more rebores than I had and was happy to follow their guidance.
No issues to report.

How this helps
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Alan H
Posts: 12141
Joined: Fri Aug 05, 2011 6:38 am
Location: Wombwell, Republic of South Yorkshire

Re: I'm back and here to stay

Post by Alan H »

IMD did the +.5 mm rebore for my 550J a couple of years ago, but I never measured the bores afterwards. However it starts on the button, 2000 miles on and at a steady 4000rpm does over 60mpg (imperial gallons) without vibration or issues.
A bit less mpg with normal running, but not spanked - that's what the 550A is for!
Proof that four strokes are over complicated
kawonda750
Posts: 17
Joined: Sat Nov 09, 2019 12:42 pm

Re: I'm back and here to stay

Post by kawonda750 »

Thank you guys. I guess I am just being too cautious. I will go with the recommended clearance. The Suzuki manual says 1.8 thou so very close to what IMD says.
kawonda750
Posts: 17
Joined: Sat Nov 09, 2019 12:42 pm

Re: I'm back and here to stay

Post by kawonda750 »

Now, my biggest roadblock is exhaust baffles. The pipes are in great shape but somewhere down the line the baffles were removed. I have contacted the seller but he doesn't know where they are. Ebay has them but for a total of about $1200. I want the bike to be quiet but am not excited about spending that kind of money either.

Is there an alternative baffle ? Or, does anyone have a set they don't need? Or, is there an expansion chamber that is relatively quiet?
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stevewharton
Posts: 2164
Joined: Mon Jul 05, 2010 11:01 am
Location: Grimsby, Lincolnshire.

Re: I'm back and here to stay

Post by stevewharton »

Hello (name?) In Canada.

Here in the UK a company called Delkevic sells new repro baffles for a GT750 kettle for around £25 to £30 each, I've bought a set and they are spot on.
Not sure about a GT550 but I think they're probably the same, well worth checking out.

Cheers Steve.
Look, my paintwork hasn't got "Fish scales" :x they're "Dragon scales" right!!! However, after some thought, I will accept "Black Marlin" or "Swordfish", but definitely not "Haddock" or "Cod".
kawonda750
Posts: 17
Joined: Sat Nov 09, 2019 12:42 pm

Re: I'm back and here to stay

Post by kawonda750 »

I have had a few Delkevic pipes on bikes Steve. I will check with them. Part numbers are different.
Thanks
Dave
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stevewharton
Posts: 2164
Joined: Mon Jul 05, 2010 11:01 am
Location: Grimsby, Lincolnshire.

Re: I'm back and here to stay

Post by stevewharton »

Hi Dave,

I've just looked at the Delkevic website and the baffles for a GT750 cost £29.99 each, I've asked the question whether they'll fit a GT550 and they'll let me know.
I do seem to remember being told a while back that they're the same, but I'll let you know asap.
A big saving for you if they do :D

Cheers Steve.
Look, my paintwork hasn't got "Fish scales" :x they're "Dragon scales" right!!! However, after some thought, I will accept "Black Marlin" or "Swordfish", but definitely not "Haddock" or "Cod".
kawonda750
Posts: 17
Joined: Sat Nov 09, 2019 12:42 pm

Re: I'm back and here to stay

Post by kawonda750 »

Thanks Steve. That would be great! There are different part numbers but maybe only a small difference that could be fixed somehow.

Otherwise, I have found universal 2 stroke baffles that may work too. I will try to get dimensions if your query doesn't work out. Your help is much appreciated.
kawonda750
Posts: 17
Joined: Sat Nov 09, 2019 12:42 pm

Re: I'm back and here to stay

Post by kawonda750 »

I managed to get the big baffles on ebay. I bought 2 bad pipes fairly cheaply and the seller took out the baffles and shipped them separately. Sure beats $249 each. Now it's just a matter of finding someone else willing to remove the smaller baffles.

The cylinders are at the machine shop being bored for IMD +1.0 mm pistons . I am waiting on one final crank seal so I can send the crank out to be done. In the meantime , there is a lot of cleaning and scraping to do. It looks so good in the pics until I get under it and see splooge and old greasy dirt.
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